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Undid revision 983198165 by Drmies (talk) as I truly believe it is useful information. Please refer to https://en.wikipedia.org/wiki/Talk:Duolingo#Number_of_links_to_duolingo.com
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* '''[[Vietnamese language|Vietnamese]]''': English
* '''[[Vietnamese language|Vietnamese]]''': English
{{div col end}}
{{div col end}}

==Language courses==

===Courses for English speakers===
{{As of|2020|06|24|df=UK}}, 36 courses are available to the public in English, three of which are [[constructed language]]s, and those three include two [[fictional language]]s.<ref>{{cite web|last1=Allan|first1=Patrick|title=Language Learning Showdown: Rosetta Stone Vs. Duolingo|url=https://www.lifehacker.com.au/2017/01/language-learning-showdown-rosetta-stone-vs-duolingo/|publisher=Lifehacker|accessdate=11 October 2017|date=16 January 2017}}</ref><ref>{{cite web|last1=Fisher|first1=Stacy|title=Duolingo Review|url=https://www.thebalance.com/duolingo-review-1357041|publisher=The Balance|accessdate=11 October 2017}}</ref><ref>{{cite web|title=Language Courses for English Speakers|url=https://en.duolingo.com/courses|publisher=Duolingo|accessdate=18 December 2018}}</ref> In this list, the courses are ordered by number of active learners.

=== Complete ===
{{columns-list|colwidth=15em|
* [[Spanish language|Spanish]] (28.40M)
* [[French of France|French]] (16.30M)
* [[German language|German]] (8.85M)
* [[Japanese language|Japanese]] (8.15M)
* [[Italian language|Italian]] (6.03M)
* [[Korean language|Korean]] (4.94M)
* [[Mandarin Chinese]] (4.47M)<ref>{{Cite news|url=https://www.theverge.com/2017/11/16/16598626/duolingo-chinese-app-language-learning-simplified-vocabulary-chatbots|title=Duolingo now supports Chinese, but it probably won't help you become fluent|work=The Verge|access-date=21 March 2018}}</ref>
* [[Russian language|Russian]] (3.72M)
* [[Hindi]] (2.81M)
* [[Arabic language|Arabic]] (2.71M)<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/ar/en/status |title= Arabic for English speakers |publisher= Duolingo | accessdate=20 July 2019}}</ref>
* [[Brazilian Portuguese]] (2.45M)
* [[Turkish language|Turkish]] (1.95M)
* [[Dutch language|Dutch]] (1.51M)
* [[Latin]] (1.42M)
* [[Swedish language|Swedish]] (1.26M)
* [[Greek language|Greek]] (1.08M)
* [[Irish language|Irish]] (1.06M)
* [[Polish language|Polish]] (940K)
* [[Bokmål|Norwegian Bokmål]] (916K)
* [[Hebrew language|Hebrew]] (874K)
* [[Vietnamese language|Vietnamese]] (627K)
* [[Hawaiian language|Hawaiian]] (602K)<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/hw/en/status |title= Hawaiian for English speakers |publisher= Duolingo | accessdate=25 April 2019}}</ref>
* [[Danish language|Danish]] (531K)
* [[Valyrian languages|High Valyrian]] (517K)<ref>{{cite web | type = status report |url= https://incubator.duolingo.com/courses/hv/en/status |title= High Valyrian for English speakers |publisher= Duolingo | accessdate=3 March 2017}}</ref>
* [[Indonesian language|Indonesian]] (486K)<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/id/en/status |title= Indonesian for English speakers |publisher= Duolingo | accessdate=5 June 2019}}</ref>
* [[Scottish Gaelic]] (483K)<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/gd/en/status |title= Scottish Gaelic for English speakers |publisher= Duolingo | accessdate=18 July 2019}}</ref>
* [[Welsh language|Welsh]] (459K)
* [[Romanian language|Romanian]] (452K)
* [[Czech language|Czech]] (422K)
* [[Swahili Language|Swahili]] (384K)
* [[Ukrainian language|Ukrainian]] (302K)
* [[Esperanto]] (288K)}}

=== Beta ===

* [[Hungarian language|Hungarian]] (318K)
* [[Klingon language|Klingon]] (297K)
* [[Navajo language|Navajo]] (286K)
* [[Finnish language|Finnish]] (274K)<ref>https://www.duolingo.com/courses/en</ref>

=== Alpha ===
{{As of|2020|10|07|df=UK}}, three courses for English speakers are in development (ordered by progression percentage towards completion according to the Weekly Incubator Update<ref>{{Cite web|title=Forum - Duolingo|url=https://forum.duolingo.com/comment/22360462|website=forum.duolingo.com|access-date=2020-05-22}}</ref>)

*[[Yiddish]]<ref>{{cite web|url=https://incubator.duolingo.com/courses/yi/en/status|title=Yiddish for English speakers|last=|first=|date=|website=|publisher=Duolingo|type=status report|url-status=live|archive-url=|archive-date=|accessdate=20 January 2020}}</ref> (98% – estimated release = early 2021)
*[[Haitian Creole]]<ref>{{cite web|url=https://incubator.duolingo.com/courses/ht/en/status|title=Haitian Creole for English speakers|last=|first=|date=|website=|publisher=Duolingo|type=status report|url-status=live|archive-url=|archive-date=|accessdate=20 January 2020}}</ref> (40% – estimated release = 31 December 2020)
*[[Māori language|Te reo Māori]]<ref>{{cite web|url=https://incubator.duolingo.com/courses/mi/en/status|title=Māori for English speakers|last=|first=|date=|website=|publisher=Duolingo|type=status report|url-status=live|archive-url=|archive-date=|accessdate=11 February 2020}}</ref> (1% – estimated release = 21 February 2021)

=== Courses available in other languages ===
As of 28 June 2020, the following languages are available to speakers of languages other than English:<ref>{{cite web |title=Duolingo Language Courses |url=https://www.duolingo.com/courses/all |website=Duolingo |accessdate=18 November 2018}}</ref>

{{div col|colwidth=30em}}
* '''[[Arabic language|Arabic]]''': English, French, German, Spanish(#), Swedish
* '''[[Bengali language|Bengali]]''': English(#)
* '''[[Chinese language|Chinese]]''': English, Esperanto(#), French,<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/fr/zh-CN/status |title= French for Chinese Speakers |publisher= Duolingo | accessdate=8 May 2019}}</ref> German(#), Italian,<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/it/zh-CN/status |title= Italian for Chinese Speakers |publisher= Duolingo | accessdate=5 October 2019}}</ref> Japanese,<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/ja/zh-CN/status |title= Japanese for Chinese Speakers |publisher= Duolingo | accessdate=8 May 2019}}</ref> Korean,<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/ko/zh-CN/status |title= Korean for Chinese Speakers |publisher= Duolingo | accessdate= 23 July 2019}}</ref> Spanish
* '''[[Czech language|Czech]]''': English
* '''[[Dutch language|Dutch]]''': English, French(#), German<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/de/nl-NL/status |title= German for Dutch Speakers |publisher= Duolingo | accessdate=18 June 2019}}</ref>
* '''[[French language|French]]''': English, Esperanto(#), German, Italian, Portuguese, Spanish
* '''[[German language|German]]''': English, French, Italian(#), Spanish
* '''[[Greek language|Greek]]''': English
* '''[[Hindi language|Hindi]]''': English
* '''[[Hungarian language|Hungarian]]''': English, German(#)
* '''[[Indonesian language|Indonesian]]''': English
* '''[[Italian language|Italian]]''': English, French, German, Spanish<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/es/it/status |title= Spanish for Italian Speakers |publisher= Duolingo | accessdate= 9 August 2019}}</ref>
* '''[[Japanese language|Japanese]]''': Chinese,<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/zh-CN/ja/status |title= Chinese for Japanese Speakers |publisher= Duolingo | accessdate=30 July 2019}}</ref> English
* '''[[Korean language|Korean]]''': English
* '''[[Polish language|Polish]]''': English
* '''[[Portuguese language|Portuguese]]''': English, Esperanto, French, German, Italian, Spanish
* '''[[Punjabi language|Punjabi]]''': English(#)
* '''[[Romanian language|Romanian]]''': English
* '''[[Russian language|Russian]]''': English, French, German, Spanish, Swedish(#)
* '''[[Spanish language|Spanish]]''': [[Catalan language|Catalan]], English, Esperanto, French, German, Guarani, Italian, [[K'iche' language|K'iche']], Portuguese, Russian, Swedish,<ref>{{cite web| type = status report | url=https://incubator.duolingo.com/courses/sv/es/status |title= Swedish for Spanish speakers |publisher= Duolingo | accessdate=8 May 2019}}</ref> [[Yucatec Maya language|Yucatec]](#)
* '''[[Tagalog language|Tagalog]]''': English(#)
* '''[[Tamil language|Tamil]]''': English(#)
* '''[[Telugu language|Telugu]]''': English(#)
* '''[[Thai language|Thai]]''': English
* '''[[Turkish language|Turkish]]''': English, French(#), German, Russian
* '''[[Ukrainian language|Ukrainian]]''': English
* '''[[Vietnamese language|Vietnamese]]''': English
<nowiki></nowiki>(#)<nowiki></nowiki> = course still in development
(β) = Course still in beta version
{{div col end}}

=== Number of languages available for speakers of 'x' language on the app and on the website ===
{| class="wikitable sortable mw-collapsible"
|-
!Rank <br />
! Number of languages<br /> available for speakers of: !! On app !! On website
|-
|1
|[[English language|English]]
|36
|39 (Haitian Creole, Maori and Yiddish in the incubator)
|-
|2
|[[Spanish language|Spanish]]|| 10 || 12 (Yucatec and K'iche in incubator)
|-
|3
|[[Chinese language|Chinese]]|| 6 || 7 (German in incubator)
|-
|4
|[[Portuguese language|Portuguese]]|| 6 || 6
|-
|5
|[[French language|French]]|| 5 || 6 (Esperanto in beta)
|-
|6
|[[Arabic language|Arabic]]|| 4 || 5 (Spanish in incubator)
|-
|7
|[[Russian language|Russian]]|| 4 || 5 (Swedish in incubator)
|-
|8
|[[Turkish language|Turkish]]|| 3 || 5 (French and Swedish in incubator)
|-
|9
|[[Italian language|Italian]]|| 3 (Spanish not available on app) || 4
|-
|10
|[[German language|German]]|| 3 || 3
|-
|11
|[[Japanese language|Japanese]]|| 2 || 2
|-
|12
|[[Dutch language|Dutch]]|| 2 || 3 (French in incubator)
|-
|13
|[[Czech language|Czech]]|| 1 || 1
|-
|14
|[[Greek language|Greek]]|| 1 || 1
|-
|15
|[[Hindi language|Hindi]]|| 1 || 1
|-
|16
|[[Hungarian language|Hungarian]]|| 1 || 2 (German in incubator)
|-
|17
|[[Indonesian language|Indonesian]]|| 1 || 1
|-
|18
|[[Korean language|Korean]]|| 1 || 1
|-
|19
|[[Polish language|Polish]]|| 1 || 1
|-
|20
|[[Romanian language|Romanian]]|| 1 || 1
|-
|21
|[[Thai language|Thai]]|| 1 || 1
|-
|22
|[[Ukrainian language|Ukrainian]]|| 1 || 1
|-
|23
|[[Vietnamese language|Vietnamese]]|| 1 || 1
|-
|24
|[[Bengali language|Bengali]]|| – || 1 (English in incubator)
|-
|25
|[[Punjabi language|Punjabi (Gurmukhi)]]|| – || 1 (English in incubator)
|-
|26
|[[Tagalog language|Tagalog]]|| – || 1 (English in incubator)
|-
|27
|[[Tamil language|Tamil]]|| – || 1 (English in incubator)
|-
|28
|[[Telugu language|Telugu]]|| – || 1 (English in incubator)
|-
|}

=== List of courses by number of learners ===
{{As of|2020|March}}, 94 courses are available to start learning, and 10 are available to be notified when they are released.<ref>{{Cite web|url=https://www.duolingo.com/courses|title=Learn a language for free|website=Duolingo|access-date=2019-12-15}}</ref>
{| class="wikitable sortable"
|+
!Rank
!Teaching
!For Speakers of
!Number of Learners
!Release date<ref>{{Cite web|url=https://duolingo.fandom.com/wiki/Course_list|title=Course list|website=Duolingo Wiki|language=en|access-date=2019-12-15}}</ref>
|-
|1
|[[English language|English]]
|[[Spanish language|Spanish]]
|27,600,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/es/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2012-03-30 – 30 March 2012
|-
|2
|[[Spanish language|Spanish]]
|[[English language|English]]
|24,200,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/es/en/Learn-Spanish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2011-11-30 – 30 November 2011
|-
|3
|[[French language|French]]
|[[English language|English]]
|13,600,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/fr/en/Learn-French|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2012-06-19 – 19 June 2012
|-
|4
|[[English language|English]]
|[[Portuguese language|Portuguese]]
|10,800,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/pt/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2012-10-30 – 30 October 2012
|-
|5
|[[German language|German]]
|[[English language|English]]
|7,820,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/de/en/Learn-German|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2011-11-30 – 30 November 2011
|-
|6
|[[Japanese language|Japanese]]
|[[English language|English]]
|6,430,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ja/en/Learn-Japanese|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2017-05-18 – 18 May 2017
|-
|7
|[[English language|English]]
|[[Russian language|Russian]]
|5,720,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/ru/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-11-02 – 2 November 2015
|-
|8
|[[Italian language|Italian]]
|[[English language|English]]
|5,300,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/it/en/Learn-Italian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2012-11-13 – 13 November 2012
|-
|9
|[[English language|English]]
|[[Arabic]]
|4,520,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/ar/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-05-09 – 9 May 2014
|-
|10
|[[English language|English]]
|[[French language|French]]
|4,430,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/fr/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2013-05-07 – 7 May 2013
|-
|11
|[[French language|French]]
|[[Spanish language|Spanish]]
|3,880,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/fr/es/Learn-French|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-01-10 – 10 January 2014
|-
|12
|[[Korean language|Korean]]
|[[English language|English]]
|3,670,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ko/en/Learn-Korean|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2017-10-10 – 10 October 2017
|-
|13
|[[Chinese language|Chinese]]
|[[English language|English]]
|3,560,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/zh/en/Learn-Chinese|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2017-11-15 – 15 November 2017
|-
|14
|[[Russian language|Russian]]
|[[English language|English]]
|3,300,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ru/en/Learn-Russian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-11-02 – 2 November 2015
|-
|16
|[[English language|English]]
|[[Chinese language|Chinese]]
|3,190,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/zh/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-04-11 – 11 April 2014
|-
|15
|[[English language|English]]
|[[Turkish language|Turkish]]
|3,050,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/tr/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2013-12-29 – 29 December 2013
|-
|17
|[[Spanish language|Spanish]]
|[[Portuguese language|Portuguese]]
|2,650,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/es/pt/Learn-Spanish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-03-09 – 9 March 2014
|-
|18
|[[Italian language|Italian]]
|[[Spanish language|Spanish]]
|2,510,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/it/es/Learn-Italian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-09-15 – 15 September 2014
|-
|19
|[[English language|English]]
|[[German language|German]]
|2,280,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/de/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2013-11-27 – 27 November 2013
|-
|20
|[[Portuguese language|Portuguese]]
|[[English language|English]]
|2,240,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/pt/en/Learn-Portuguese|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2012-10-30 – 30 October 2012
|-
|21
|[[English language|English]]
|[[Vietnamese language|Vietnamese]]
|2,150,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/vi/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-06-10 – 10 June 2014
|-
|22
|[[English language|English]]
|[[Italian language|Italian]]
|2,120,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/it/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2012-11-24 – 24 November 2012
|-
|23
|[[Portuguese language|Portuguese]]
|[[Spanish language|Spanish]]
|2,110,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/pt/es/Learn-Portuguese|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-02-01 – 1 February 2014
|-
|24
|[[English language|English]]
|[[Polish language|Polish]]
|1,660,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/pl/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-01-19 – 19 January 2014
|-
|25
|[[German language|German]]
|[[Spanish language|Spanish]]
|1,590,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/de/es/Learn-German|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-05-19 – 19 May 2014
|-
|26
|[[English language|English]]
|[[Hindi]]
|1,520,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/hi/Learn-English|title=Learn a language for free|website=Duolingo|access-date=2019-12-04}}</ref>
|2014-04-21 – 21 April 2014
|-
|27
|[[Turkish language|Turkish]]
|[[English language|English]]
|1,450,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/tr/en/Learn-Turkish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2013-12-29 – 29 December 2013
|-
|28
|[[Spanish language|Spanish]]
|[[French language|French]]
|1,430,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/es/fr/Learn-Spanish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-05-21 – 21 May 2014
|-
|29
|[[Arabic]]
|[[English language|English]]
|1,410,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ar/en/Learn-Arabic|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2019-06-25 – 25 June 2019
|-
|30
|[[French language|French]]
|[[Portuguese language|Portuguese]]
|1,400,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/fr/pt/Learn-French|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-03-12 – 12 March 2015
|-
|31
|[[Dutch language|Dutch]]
|[[English language|English]]
|1,350,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/nl-NL/en/Learn-Dutch|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-07-16 – 16 July 2014
|-
|32
|[[Swedish language|Swedish]]
|[[English language|English]]
|1,190,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/sv/en/Learn-Swedish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-11-17 – 17 November 2014
|-
|33
|[[English language|English]]
|[[Japanese language|Japanese]]
|1,170,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/ja/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-03-03 – 3 March 2014
|-
|34
|[[English language|English]]
|[[Indonesian language|Indonesian]]
|1,140,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/id/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-04-23 – 23 April 2014
|-
|35
|[[Spanish language|Spanish]]
|[[German language|German]]
|1,080,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/es/de/Learn-Spanish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-09-01 – 1 September 2015
|-
|36
|[[Hindi]]
|[[English language|English]]
|1,070,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/hi/en/Learn-Hindi|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-01-24}}</ref>
|2018-07-18 – 18 July 2018
|-
|37
|[[Greek language|Greek]]
|[[English language|English]]
|1,040,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/el/en/Learn-Greek|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-01-24}}</ref>
|2016-08-30 – 30 August 2016
|-
|38
|[[Japanese language|Japanese]]
|[[Chinese language|Chinese]]
|958,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ja/zh/Learn-Japanese|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-01-24}}</ref>
|2019-04-24 – 24 April 2019
|-
|39
|[[English language|English]]
|[[Romanian language|Romanian]]
|942,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/ro/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-01-24}}</ref>
|2014-02-04 – 4 February 2014
|-
|40
|[[Irish language|Irish]]
|[[English language|English]]
|924,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ga/en/Learn-Irish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-01-24}}</ref>
|2014-08-25 – 25 August 2014
|-
|41
|[[German language|German]]
|[[Russian language|Russian]]
|887,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/de/ru/Learn-German|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-01-24}}</ref>
|2014-03-26 – 26 March 2014
|-
|42
|[[English language|English]]
|[[Dutch language|Dutch]]
|879,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/nl-NL/Learn-English|title=Learn a language for free|website=Duolingo|access-date=2019-12-04}}</ref>
|2013-12-23 – 23 December 2013
|-
|43
|[[Polish language|Polish]]
|[[English language|English]]
|877,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/pl/en/Learn-Polish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-12-10 – 10 December 2015
|-
|44
|[[Valyrian languages|High Valyrian]]
|[[English language|English]]
|875,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/hv/en/Learn-High%20Valyrian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-01-24}}</ref>
|2017-07-12 – 12 July 2017
|-
|45
|[[Norwegian (Bokmål)|Norwegian]]
|[[English language|English]]
|841,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/no-BO/en/Learn-Norwegian%20Bokm%C3%A5l|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-05-21 – 21 May 2015
|-
|46
|[[Hebrew language|Hebrew]]
|[[English language|English]]
|814,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/he/en/Learn-Hebrew|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-06-21 – 21 June 2016
|-
|47
|[[English language|English]]
|[[Czech language|Czech]]
|803,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/cs/Learn-English|title=Learn a language for free|website=Duolingo|access-date=2019-12-04}}</ref>
|2014-10-17 – 17 October 2014
|-
|48
|[[Italian language|Italian]]
|[[Portuguese language|Portuguese]]
|765,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/it/pt/Learn-Italian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2017-06-13 – 13 June 2017
|-
|49
|[[French language|French]]
|[[Arabic]]
|761,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/fr/ar/Learn-French|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-02-02 – 2 February 2016
|-
|50
|[[French language|French]]
|[[German language|German]]
|750,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/fr/de/Learn-French|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-03-31 – 31 March 2014
|-
|51
|[[English language|English]]
|[[Hungarian language|Hungarian]]
|713,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/hu/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-01-08 – 8 January 2014
|-
|52
|[[Russian language|Russian]]
|[[Spanish language|Spanish]]
|706,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ru/es/Learn-Russian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2018-06-20 – 20 June 2018
|-
|53
|[[Catalan language|Catalan]]
|[[Spanish language|Spanish]]
|679,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ca/es/Learn-Catalan|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-11-19 – 19 November 2015
|-
|54
|[[Latin]]
|[[English language|English]]
|676,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/la/en/Learn-Latin|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2019-08-28 – 28 August 2019
|-
|55
|[[German language|German]]
|[[Portuguese language|Portuguese]]
|669,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/de/pt/Learn-German|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-09-15 – 15 September 2015
|-
|56
|[[English language|English]]
|[[Korean language|Korean]]
|632,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/ko/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-05-26 – 26 May 2014
|-
|57
|[[French language|French]]
|[[Russian language|Russian]]
|620,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/fr/ru/Learn-French|title=Learn a language for free|website=Duolingo|access-date=2019-12-04}}</ref>
|2016-02-18 – 18 February 2016
|-
|58
|[[Vietnamese language|Vietnamese]]
|[[English language|English]]
|583,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/vi/en/Learn-Vietnamese|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-04-21 – 21 April 2016
|-
|59
|[[English language|English]]
|[[Ukrainian language|Ukrainian]]
|565,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/uk/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-08-12 – 12 August 2014
|-
|60
|[[Italian language|Italian]]
|[[French language|French]]
|562,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/it/fr/Learn-Italian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-11-06 – 6 November 2014
|-
|61
|[[Korean language|Korean]]
|[[Chinese language|Chinese]]
|559,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ko/zh/Learn-Korean|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2019-04-24 – 24 April 2019
|-
|62
|[[Hawaiian language|Hawaiian]]
|[[English language|English]]
|554,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/hw/en/Learn-Hawaiian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2018-10-05 – 5 October 2018
|-
|63
|[[German language|German]]
|[[French language|French]]
|550,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/de/fr/Learn-German|title=Learn a language for free|website=Duolingo|access-date=2019-12-04}}</ref>
|2015-10-14 – 14 October 2015
|-
|64
|[[Spanish language|Spanish]]
|[[Russian language|Russian]]
|544,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/es/ru/Learn-Spanish|title=Learn a language for free|website=Duolingo|access-date=2019-12-04}}</ref>
|2016-03-02 – 2 March 2016
|-
|65
|[[German language|German]]
|[[Turkish language|Turkish]]
|538,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/de/tr/Learn-German|title=Learn a language for free|website=Duolingo|access-date=2019-12-04}}</ref>
|2015-12-14 – 14 December 2015
|-
|66
|[[Danish language|Danish]]
|[[English language|English]]
|506,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/da/en/Learn-Danish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-08-25 – 25 August 2014
|-
|67
|[[Romanian language|Romanian]]
|[[English language|English]]
|438,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ro/en/Learn-Romanian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-11-15 – 15 November 2016
|-
|68
|[[Czech language|Czech]]
|[[English language|English]]
|416,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/cs/en/Learn-Czech|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2017-09-05 – 5 September 2017
|-
|69
|[[Spanish language|Spanish]]
|[[Chinese language|Chinese]]
|406,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/es/zh/Learn-Spanish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-07-06 – 6 July 2016
|-
|70
|[[German language|German]]
|[[Arabic]]
|392,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/de/ar/Learn-German|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-03-07 – 7 March 2016
|-
|71
|[[Welsh language|Welsh]]
|[[English language|English]]
|389,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/cy/en/Learn-Welsh|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-01-26 – 26 January 2016
|-
|72
|[[Indonesian language|Indonesian]]
|[[English language|English]]
|387,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/id/en/Learn-Indonesian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2018-08-15 – 15 August 2018
|-
|73
|[[French language|French]]
|[[Italian language|Italian]]
|364,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/fr/it/Learn-French|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-10-08 – 8 October 2015
|-
|74
|[[Swahili language|Swahili]]
|[[English language|English]]
|358,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/sw/en/Learn-Swahili|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2017-02-20 – 20 February 2017
|-
|75
|[[Klingon language|Klingon]]
|[[English language|English]]
|344,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/tlh/en/Learn-Klingon|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2018-03-15 – 15 March 2018
|-
|76
|[[English language|English]]
|[[Thai language|Thai]]
|337,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/th/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2017-05-10 – 10 May 2017
|-
|77
|[[German language|German]]
|[[Italian language|Italian]]
|316,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/de/it/Learn-German|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2017-01-09 – 9 January 2017
|-
|78
|[[Hungarian language|Hungarian]]
|[[English language|English]]
|314,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/hu/en/Learn-Hungarian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-06-30 – 30 June 2016
|-
|79
|[[Ukrainian language|Ukrainian]]
|[[English language|English]]
|308,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/uk/en/Learn-Ukrainian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-05-21 – 21 May 2015
|-
|80
|[[Russian language|Russian]]
|[[Turkish language|Turkish]]
|293,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ru/tr/Learn-Russian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2018-02-08 – 8 February 2018
|-
|81
|[[Navajo language|Navajo]]
|[[English language|English]]
|292,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/nv/en/Learn-Navajo|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2018-10-05 – 5 October 2018
|-
|82
|[[Esperanto]]
|[[English language|English]]
|282,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/eo/en/Learn-Esperanto|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2015-05-28 – 28 May 2015
|-
|83
|[[Portuguese language|Portuguese]]
|[[French language|French]]
|279,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/pt/fr/Learn-Portuguese|title=Learn a language for free|website=Duolingo|access-date=2019-12-04}}</ref>
|2017-01-30 – 30 January 2017
|-
|84
|[[English language|English]]
|[[Greek language|Greek]]
|255,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/en/el/Learn-English|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2014-04-25 – 25 April 2014
|-
|85
|[[Esperanto]]
|[[Spanish language|Spanish]]
|254,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/eo/es/Learn-Esperanto|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-10-26 – 26 October 2016
|-
|86
|[[Guarani language|Guarani]]
|[[Spanish language|Spanish]]
|250,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/gn/es/Learn-Guarani%20Jopar%C3%A1|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-08-30 – 30 August 2016
|-
|87
|[[French language|French]]
|[[Chinese language|Chinese]]
|237,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/fr/zh/Learn-French|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2019-04-24 – 24 April 2019
|-
|88
|[[Esperanto]]
|[[Portuguese language|Portuguese]]
|216,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/eo/pt/Learn-Esperanto|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2018-05-15 – 15 May 2018
|-
|89
|[[Scottish Gaelic]]
|[[English language|English]]
|167,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/gd/en/Learn-Scottish%20Gaelic|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2019-11-27 – 27 November 2019
|-
|90
|[[Swedish language|Swedish]]
|[[Arabic]]
|147,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/sv/ar/Learn-Swedish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2016-03-01 – 1 March 2016
|-
|91
|[[Italian language|Italian]]
|[[Chinese language|Chinese]]
|83,800<ref>{{Cite web|url=https://www.duolingo.com/enroll/it/zh/Learn-Italian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2019-04-24 – 24 April 2019
|-
|92
|[[Spanish language|Spanish]]
|[[Italian language|Italian]]
|68,800<ref>{{Cite web|url=https://www.duolingo.com/enroll/es/it/Learn-Spanish|title=Learn a language for free|website=Duolingo|access-date=2019-12-19}}</ref>
|2018-08-22 – 22 August 2018
|-
|93
|[[Chinese language|Chinese]]
|[[Japanese language|Japanese]]
|48,500<ref>{{Cite web|url=https://www.duolingo.com/enroll/zh/ja/Learn-Chinese|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2019-11-21 – 21 November 2019
|-
|94
|[[Swedish language|Swedish]]
|[[Spanish language|Spanish]]
|31,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/sv/es/Learn-Swedish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2019-12-19}}</ref>
|2019-11-30 – 30 November 2019
|-
|95
|[[German language|German]]
|[[Dutch language|Dutch]]
|19,300<ref>{{Cite web|url=https://www.duolingo.com/enroll/de/nl-NL/Learn-German|title=Learn a language for free|website=Duolingo|access-date=2020-04-12}}</ref>
|
|}

=== List of courses in beta ===
As of 7 May 2020, 7 courses are in the beta phase on Duolingo.<ref name="incubator.duolingo.com">{{Cite web|url=https://incubator.duolingo.com/|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref> Date courses started development were obtained from the Duolingo Wiki.<ref name="Course list">{{Cite web|url=https://duolingo.fandom.com/wiki/Course_list|title=Course list|last=|first=|date=|website=Duolingo Wiki|language=en|access-date=2020-04-12}}</ref>
{| class="wikitable sortable"
|+
!Rank
!Teaching
!For Speakers of
!Number of Learners
!Date courses started development
!Release date into Beta
|-
|1
|[[Korean language|Korean]]
|[[Chinese language|Chinese]]
|1,090,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/ko/zh/Learn-Korean|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-04-17}}</ref>
|2018-09-10 – 10 September 2018
|2019-04-24 – 24 April 2019
|-
|2
|[[Spanish language|Spanish]]
|[[Chinese language|Chinese]]
|423,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/es/zh/Learn-Spanish|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-04-12}}</ref>
|2016-07-06 – 6 July 2016
|2018-06-25 – 25 June 2018
|-
|3
|[[Hungarian language|Hungarian]]
|[[English language|English]]
|318,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/hu/en/Learn-Hungarian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-04-12}}</ref>
|2014-03-12 – 12 March 2014
|2016-06-30 – 30 June 2016
|-
|4
|[[Klingon language|Klingon]]
|[[English language|English]]
|297,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/tlh/en/Learn-Klingon|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-04-12}}</ref>
|2015-04-09 – 9 April 2015
|2018-03-15 – 15 March 2018
|-
|5
|[[Navajo language|Navajo]]
|[[English language|English]]
|286,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/nv/en/Learn-Navajo|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-04-12}}</ref>
|2018-08-23 – 23 August 2018
|2018-10-05 – 5 October 2018
|-
|6
|[[Esperanto]]
|[[Portuguese language|Portuguese]]
|207,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/eo/pt/Learn-Esperanto|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-04-12}}</ref>
|2017-03-13 – 13 March 2017
|2018-05-15 – 15 May 2018
|-
|7
|[[Italian language|Italian]]
|[[Chinese language|Chinese]]
|136,000<ref>{{Cite web|url=https://www.duolingo.com/enroll/it/zh/Learn-Italian|title=Learn a language for free|last=|first=|date=|website=Duolingo|access-date=2020-04-12}}</ref>
|2018-09-10 – 10 September 2018
|2019-04-24 – 24 April 2019
|}

=== List of courses being created ===
As of 24 June 2020, 20 courses are currently being developed on Duolingo.<ref name="incubator.duolingo.com"/> Percentages are based on jrikhal's Weekly Incubator Summary.<ref>{{Cite web|url=https://forum.duolingo.com/comment/37363381|title=Forum - Duolingo|last=|first=|date=|website=forum.duolingo.com|access-date=2020-04-04}}</ref>
{| class="wikitable sortable mw-collapsible"
|+
!Rank by<br>Estimated<br>Completion
!Teaching
!For<br>Speakers of
!Percent<br>completed
!Date courses started<br>development <ref name="Course list"/>
!Estimated<br>completion date
!Number of Contributors
|-
|1
|[[English language|English]]
|[[Tamil language|Tamil]]
|82%
|2016-06-01 – 1 June 2016
|2020-08-01 – 1 August 2020
|2<ref>{{Cite web|url=https://incubator.duolingo.com/courses/en/ta/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|2
|[[English language|English]]
|[[Bengali language|Bengali]]
|79%
|2016-06-02 – 6 June 2016
|2022-02-21 – 21 February 2022
|2<ref>{{Cite web|url=https://incubator.duolingo.com/courses/en/bn/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|3
|[[Yiddish]]
|[[English language|English]]
|78%
|2015-02-19 – 19 February 2015
|2020-12-31 – 31 December 2020
|9<ref>{{Cite web|url=https://incubator.duolingo.com/courses/yi/en/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|4
|[[Swedish language|Swedish]]
|[[Russian language|Russian]]
|66%
|2015-02-18 – 18 February 2015
|2021-04-24 – 24 February 2021
|0<ref>{{Cite web|url=https://incubator.duolingo.com/courses/sv/ru/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|5
|[[English language|English]]
|[[Tagalog language|Tagalog]]
|49%
|2016-08-30 – 30 August 2016
|2020-09-01 – 1 September 2020
|2<ref>{{Cite web|url=https://incubator.duolingo.com/courses/en/tl/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|6
|[[Spanish language|Spanish]]
|[[Arabic]]
|30%
|2016-09-12 – 12 September 2016
|9999-12-31 – 31 December 9999
|3<ref>{{Cite web|url=https://incubator.duolingo.com/courses/es/ar/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|7
|[[English language|English]]
|[[Punjabi language|Punjabi (Gurmakhi)]]
|29%
|2016-12-08 – 8 December 2016
|2019-07-08 – 8 July 2019
|2<ref>{{Cite web|url=https://incubator.duolingo.com/courses/en/pa/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|8
|[[Esperanto]]
|[[French language|French]]
|
|
|2020-07-01 – 1 July 2020
|10<ref>{{Cite web|url=https://incubator.duolingo.com/courses/eo/fr/status|title=Duolingo|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|9
|[[French language|French]]
|[[Turkish language|Turkish]]
|28%
|2015-10-27 – 27 October 2015
|2022-02-19 – 19 February 2022
|0<ref>{{Cite web|url=https://incubator.duolingo.com/courses/fr/tr/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|11
|[[Finnish language|Finnish]]
|[[English language|English]]
|18%
|2019-04-17 – 17 April 2019
|2020-12-31 – 31 December 2020
|7<ref>{{Cite web|url=https://incubator.duolingo.com/courses/fi/en/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|12
|[[Haitian Creole]]
|[[English language|English]]
|18%
|2017-01-27 – 27 January 2017
|2020-07-01 – 1 July 2020
|5<ref>{{Cite web|url=https://incubator.duolingo.com/courses/ht/en/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|13
|[[French language|French]]
|[[Dutch language|Dutch]]
|
|
|2020-12-20 – 20 December 2020
|9<ref>{{Cite web|url=https://incubator.duolingo.com/courses/fr/nl-NL/status|title=Duolingo|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|14
|[[Esperanto]]
|[[Chinese language|Chinese]]
|
|
|2020-05-06 – 6 May 2020
|12<ref>{{Cite web|url=https://incubator.duolingo.com/courses/eo/zh-CN/status|title=Duolingo|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|15
|[[Māori language|Māori]]
|[[English language|English]]
|1%
|2020-02-12 – 12 February 2020
|2021-02-21 – 21 February 2021
|3<ref>{{Cite web|url=https://incubator.duolingo.com/courses/mi/en/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|16
|[[German language|German]]
|[[Hungarian language|Hungarian]]
|0.5%
|2019-06-18 – 18 June 2019
|2020-03-25 – 25 March 2020
|5<ref>{{Cite web|url=https://incubator.duolingo.com/courses/de/nl-NL/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|17
|[[Italian language|Italian]]
|[[German language|German]]
|0.25%
|
|2021-03-12 – 12 March 2021
|2<ref>{{Cite web|url=https://incubator.duolingo.com/courses/it/de/status|title=Duolingo|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|18
|[[German language|German]]
|[[Chinese language|Chinese]]
|0%
|2018-09-10 – 10 September 2018
|2020-06-30 – 30 June 2020
|1<ref>{{Cite web|url=https://incubator.duolingo.com/courses/de/zh-CN/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|19
|[[English language|English]]
|[[Hebrew language|Hebrew]]
|0%
|2019-11-03 – 3 November 2019
|2020-04-12 – 12 April 2020
|0<ref>{{Cite web|url=https://incubator.duolingo.com/courses/en/he/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|20
|[[Yucatec Maya language|Yucatec]]
|[[Spanish language|Spanish]]
|0%
|2020-02-12 – 12 February 2020
|2021-02-12 – 12 February 2021
|4<ref name="ReferenceA">{{Cite web|url=https://incubator.duolingo.com/courses/yu/es/status|title=Duolingo|last=|first=|date=|website=incubator.duolingo.com|access-date=2020-04-12}}</ref>
|-
|21
|[[Kʼicheʼ language|K'iche']]
|[[Spanish language|Spanish]]
|0%
|2020-02-12 – 12 February 2020
|2021-02-12 – 12 February 2021
|0<ref name="ReferenceA"/>
|-
|22
|[[Chinese language|Chinese]]
|[[Korean language|Korean]]
|
|
|2020-10-14 – 14 October 2020
|1<ref name="ReferenceA"/>
|}

=== Chart of Courses ===

{| border="1" style="border-collapse: collapse; text-align: center; width: auto; table-layout: fixed;"
!
!{{flagdeco|USA}}
!{{flagdeco|Spain}}
!{{flagdeco|France}}
!{{flagdeco|Germany}}
!{{flagdeco|Italia}}
!{{flagdeco|Japan}}
!{{flagdeco|South Korea}}
!{{flagdeco|China}}
!{{flagdeco|Russia}}
!{{flagdeco|Portugal}}
!{{flagdeco|Turkey}}
!{{flagdeco|Netherlands}}
!{{flagdeco|Sweden}}
!{{flagdeco|Ireland}}
!{{flagdeco|Greece}}
!{{flagdeco|Israel}}
!{{flagdeco|Poland}}
!{{flagdeco|Norway}}
!{{flagdeco|Catalonia}}
!{{flagdeco|Vietnam}}
!{{flagdeco|Denmark}}
!{{flagdeco|Romania}}
!{{flagdeco|Tanzania}}
![[Image:Flag_of_Esperanto.svg|25px]]
!{{flagdeco|Hungary}}
!{{flagdeco|Paraguay}}
!{{flagdeco|Wales}}
!{{flagdeco|Ukraine}}
!{{flagdeco|India}}
!{{flagdeco|Czech Republic}}
!{{flagdeco|Hawaii}}
!{{flagdeco|Indonesia}}
!{{flagdeco|Saudi Arabia}}
|-
! style="text-align:left;" |[[German language|German]]
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
|x
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! style="text-align:left;" |[[Arabic]]
| style="background:#4DA14D" |
| style="background:#EEFC4C" |
| style="background:#4DA14D" |
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! style="text-align:left;" |[[Bengali language|Bengali]]
| style="background:#EEFC4C" |
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! style="text-align:left;" |[[Czech language|Czech]]
| style="background:#4DA14D" |
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|x
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! style="text-align:left;" |[[Chinese language|Chinese]]
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#EEFC4C" |
| style="background:#EEFC4C" |
| style="background:#EEFC4C" |
| style="background:#EEFC4C" |
| style="background:#EEFC4C" |
|x
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! style="text-align:left;" |[[Korean language|Korean]]
| style="background:#4DA14D" |
|
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|x
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|-
! style="text-align:left;" |[[Spanish language|Spanish]]
| style="background:#4DA14D" |
|x
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
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| style="background:#4DA14D" |
| style="background:#4DA14D" |
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| style="background:#66D466" |
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| style="background:#4DA14D" |
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| style="background:#4DA14D" |
|
| style="background:#4DA14D" |
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|-
! style="text-align:left;" |[[French language|French]]
| style="background:#4DA14D" |
| style="background:#4DA14D" |
|x
| style="background:#4DA14D" |
| style="background:#4DA14D" |
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! style="text-align:left;" |[[Greek language|Greek]]
| style="background:#4DA14D" |
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|x
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! style="text-align:left;" |[[Hindi]]
| style="background:#4DA14D" |
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|x
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! style="text-align:left;" |[[Hungarian language|Hungarian]]
| style="background:#4DA14D" |
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|x
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|-
! style="text-align:left;" |[[Indonesian language|Indonesian]]
| style="background:#4DA14D" |
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|x
|
|-
! style="text-align:left;" |[[English language|English]]
|x
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
|
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#66D466" |
| style="background:#66D466" |
|
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
|-
! style="text-align:left;" |[[Italian language|Italian]]
| style="background:#4DA14D" |
| style="background:#EEFC4C" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
|x
|
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|-
! style="text-align:left;" |[[Japanese language|Japanese]]
| style="background:#4DA14D" |
|
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|x
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|-
! style="text-align:left;" |[[Dutch language|Dutch]]
| style="background:#4DA14D" |
|
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|x
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|-
! style="text-align:left;" |[[Punjabi language|Punjabi]]
| style="background:#EEFC4C" |
|
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|-
! style="text-align:left;" |[[Polish language|Polish]]
| style="background:#4DA14D" |
|
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|x
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|-
! style="text-align:left;" |[[Portuguese language|Portuguese]]
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
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|x
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| style="background:#66D466" |
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|-
! style="text-align:left;" |[[Romanian language|Romanian]]
| style="background:#4DA14D" |
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|x
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|-
! style="text-align:left;" |[[Russian language|Russian]]
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
| style="background:#4DA14D" |
|
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|x
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|-
! style="text-align:left;" |[[Tagalog language|Tagalog]]
| style="background:#EEFC4C" |
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|-
! style="text-align:left;" |[[Tai languages|Tai]]
| style="background:#4DA14D" |
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|-
! style="text-align:left;" |[[Tamil language|Tamil]]
| style="background:#EEFC4C" |
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|-
! style="text-align:left;" |[[Telugu language|Telugu]]
| style="background:#EEFC4C" |
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|-
! style="text-align:left;" |[[Turkish language|Turkish]]
| style="background:#4DA14D" |
|
| style="background:#EEFC4C" |
| style="background:#4DA14D" |
|
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| style="background:#4DA14D" |
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|x
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|-
! style="text-align:left;" |[[Ukrainian language|Ukrainian]]
| style="background:#4DA14D" |
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|x
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|-
! style="text-align:left;" |[[Vietnamese language|Vietnamese]]
| style="background:#4DA14D" |
|
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|x
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|-
|}


==See also==
==See also==

Revision as of 13:22, 28 October 2020

Duolingo, Inc.
Screenshot
File:Duolingo homepage.png
Duolingo homepage (before 2019)
Type of businessPrivate
Available in
HauptsitzPittsburgh, Pennsylvania, United States
Area servedWorld
Founder(s)Luis von Ahn, Severin Hacker
CEOLuis von Ahn
IndustrieOnline education, Professional certification, Translation, Crowdsourcing
ServicesLanguage courses, Duolingo English Test, Duolingo for Schools, Tinycards flashcard app
RevenueIncrease$ 36 million USD in 2018[1]
Employees200+[2]
URLwww.duolingo.com
WerbungYes
RegistrationNo
Users>300 million users[3]
Launched30 November 2011; 12 years ago (2011-11-30) (private beta)
19 June 2012; 12 years ago (2012-06-19) (public release)
Current statusOnline
Native client(s) onAndroid, iOS, Windows Phone, Windows 10 Mobile
Written inKotlin,[4] Swift,[5] React, Python, Scala[6]HTML, CSS, JavaScript

Duolingo (/ˌduːoʊˈlɪŋɡoʊ, djuː-, dʒuː-/ D(Y)OO-oh-LING-goh) is an American language-learning website and mobile app, as well as a digital language-proficiency assessment exam. The company uses the freemium model; the app and the website are accessible without charge, although Duolingo also offers a premium service for a fee.

As of 13 October 2020, the language-learning website and app offered 98 different language courses in 38 languages.[8] The app has over 300 million registered users across the world.[9][10][11][12]

History

2010–2019 logo

The project was initiated at the end of 2009 in Pittsburgh by Carnegie Mellon University professor Luis von Ahn (creator of reCAPTCHA) and his graduate student Severin Hacker, and then developed along with Antonio Navas, Vicki Cheung, Marcel Uekermann, Brendan Meeder, Hector Villafuerte, and Jose Fuentes.[13][14][15]

The inspiration for Duolingo came from two places. Luis von Ahn wanted to create a program that served two purposes in one, what he calls a "twofer".[16] Duolingo originally achieved this by teaching its users a foreign language while having them translate simple phrases in documents, though the translation feature has since been removed.[17]

Von Ahn was born in Guatemala. He saw how expensive it was for people in his community to learn English. Severin Hacker (born in Zug, Switzerland), co-founder of Duolingo and current CTO, and von Ahn believed that "free education will really change the world"[18] and wanted to supply people an outlet to do so.

The project was originally sponsored by Luis von Ahn's MacArthur fellowship and a National Science Foundation grant.[19][20]

On October 19, 2011, during in its "Early Stage Venture" stage Duolingo raised $3.3 million from a Series A first-round of funding, led by Union Square Ventures, with participation from author Tim Ferriss and actor Ashton Kutcher's firm, A-Grade Investments [21][22][23]

Duolingo launched into private beta a month later on November 30, 2011, and accumulated a waiting list of more than 300,000 users.[24][25][15]

On June 19, 2012, Duolingo later launched for the general public.[26]

On September 17, 2012, while still in its "Early Stage Venture" stage, Duolingo raised $15 million from a Series B second-round of funding led by New Enterprise Associates, with participation from Union Square Ventures bringing Duolingo's total funding to $18.3 million.[27]

On 13 November 2012, Duolingo released their iOS app through the iTunes App Store.[28] The application is a free download and is compatible with most iPhone, iPod and iPad devices.[29]

On 29 May 2013, Duolingo released their Android app, which was downloaded about a million times in the first three weeks and quickly became the #1 education app in the Google Play store.[30]

On June 19, 2013, one year after launching for the general public, Duolingo passed 4 million users, all through word of mouth,[31] and on November 21, 2013, Duolingo reached 15 million users[31]

On February 18, 2014, Duolingo entered its "Late Stage Venture" stage, and raised $20 million from a Series C third-round of funding led by Kleiner Caufield & Byers.[32] It was reported Duolingo had had about 25 million registered users, 12.5 million active users, and 34 employees.[33] On June 2, 2014, Duolingo passed 30 million users[31]

On June 10, 2015, Duolingo raised $45 million from a Series D fourth-round of funding led by Google Capital, bringing its total funding to $83.3 million, a valuation of $470 million, as well as passing 100 million users.[34][35][36]

In April 2016, it was reported that Duolingo had 17 million monthly users.[37][38]

On July 25, 2017, that Duolingo raised $25 million from a Series E fifth-round of investment from Drive Capital, bringing its total funding to $108.3 million, a valuation of $700 million, as well as passing 200 million users and having 25 million monthly users.[39][40] It was reported that Duolingo had 95 employees,[41] and the funds would be directed toward creating initiatives such as TinyCards and Duolingo Labs.[42]

On August 1, 2018, it was reported Duolingo had passed 300 million users.[43]

On December 4, 2019, it was announced that Duolingo raised $30 million in a series F sixth-round of investment from Alphabet’s investment company CapitalG, bringing a total funding of $138.3 million, a valuation of $1.5 billion, reporting 30 million monthly active learners.[44] Duolingo will use the funds on developing new products and expanding its team. Expanding the team will span a variety of positions, including in engineering, business development, design, curriculum and content creators, community outreach and marketing.[45]

During 2019, Duolingo grew from 170 staff members[46] to 200 employees,[41] with headquarters in the Pittsburgh neighborhood of East Liberty[47][48][49] and offices in New York; Bellevue, Washington (near Seattle); and Beijing.[41][50] Of Duolingo’s 200 employees, 166 work in its East Liberty headquarters, 17 work in New York, 8 in Bellevue, and 8 in China.[45]

Duolingo had a revenue of $1 million in 2016, $13 million in 2017,[43] $36 million in 2018,[46] and was projected to hit $86 million in 2019.[51]

Business model

Most language-learning features in Duolingo are free of charge, but it has periodic advertising in both its mobile and web browser applications,[52][53] which users can remove by paying a subscription fee. This feature, ‘Duolingo Plus’, includes benefits such as unlimited hearts, level skipping, and progress quizzes. It originally employed a crowd sourced business model, where the content came from organizations (such as CNN and BuzzFeed) that paid Duolingo to translate it.[54]

Infrastructure

Duolingo uses many services in the Amazon Web Services suite of products, including Amazon DynamoDB, Amazon Virtual Private Cloud, nearly 200 virtual instances in Amazon Elastic Compute Cloud (EC2), Amazon Simple Storage Service (S3) and Amazon Relational Database Service (RDS).[55] The server backend is written in the programming language Python.[better source needed] A component called the Session Generator was rewritten in Scala by 2017.[6] The frontend was written in Backbone.js and Mustache but is now primarily in React and Redux. Duolingo provides a single-page web application for desktop computer users and also smart phone applications on Android (both Google Play Store and Amazon Appstore), iOS App Store and Windows Phone platforms. 20% of traffic comes from desktop users and 80% from mobile app users.[55]

Duolingo's mascot, a green cartoon owl named Duo, has been a subject of an Internet meme in which the mascot will stalk and threaten users if they do not keep using the app.[56] Acknowledging the meme, Duolingo released a video on April 1, 2019 as an April Fools' Day joke; the video depicts a fictitious new premium feature called "Duolingo Push". In the video, users of "Duolingo Push" will receive reminders to use the app in person by Duo himself, who stares at users and follows them around until they use the app (in the video, Duo is depicted by a person in a large mascot costume).[57][58]

In November 2019, Saturday Night Live parodied Duolingo in a skit where adults learned to communicate with children using a fictitious course on the app titled "Duolingo for Talking to Children".[59]

Recognition and awards

In 2013, Apple chose Duolingo as its iPhone App of the Year, the first time this honor had been awarded to an educational application.[60] Duolingo won Best Education Startup at the 2014 Crunchies,[47] and was the most downloaded app in the Education category in Google Play in 2013 and 2014.[61] In 2015, Duolingo was announced the 2015 award winner in Play & Learning category by Design to Improve Life.[62]

Duolingo was named No. 44 on Fast Company's "The World's 50 Most Innovative Companies" list in 2018 "for making new languages irresistible".[63] No. 2 on Fast Company's "The World's Most Innovative Companies: Education Honorees" in 2018 "for making a new language irresistible",[64] and No. 2 on Fast Company's "The World's Most Innovative Companies: Education Honorees" in 2017 "for letting friends compare notes as they learn a new language".[65] No. 6 on Fast Company's "The World's Most Innovative Companies: Social Media Honorees" in 2017 "for letting friends compare notes".[66] No. 7 on Fast Company's "The World's Most Innovative Companies: Education Honorees" in 2013 "for crowdsourcing web translation by turning it into a free language-learning program".[67]

Duolingo won Inc. magazine's Best Workplaces 2018,[68] Entrepreneur magazine's Top Company Culture List 2018,[69] and appeared in CNBC's 2018 and 2019 "Disruptor 50" lists.[70][71][72] TIME Magazine's 50 Genius Companies.[73] In 2019, Duolingo was named one of Forbes's "Next Billion-Dollar Startups 2019".[74]

Eigenschaften

Duolingo mimics the structure of video games in several ways in order to engage its users. It features a reward system in which users acquire "lingots", an in-game currency that they can spend on features such as character customizations or bonus levels (both available on the mobile app only).

On public leaderboards people can compete against their friends or see how they stack up against the rest of the world. The level system that Duolingo uses is XP (experience points), a numerical system that represents a user's skill-level. Badges in Duolingo represent achievements that are earned from completing specific objectives or challenges.[75]

The study process in Duolingo combines various methods such as: listening to the pronunciation, reading sentences, voice recording, forming phrases by ordering words and matching images to words.[76]

Use in schools

Duolingo provides "Duolingo for Schools" with features designed to allow teachers to track students' progress. In 2012 an effectiveness study concluded that Duolingo usage for Spanish study was more effective than classroom language-learning alone, but that Duolingo was less effective for advanced language-learners.[77] One proposed reason for this is that the grammar-translation method that Duolingo primarily uses is more applicable to simple words and phrases than to complex ones; simpler ones can translate in a more exact manner from one language to another and thus are more conducive to Duolingo's grammar-translation method.[78]

Criticism

Duolingo has received criticism for its lack of effectiveness in helping students to fully learn a language. Duolingo's CEO, Luis von Ahn, promises only to get users to a level between advanced beginner and early intermediate: "A significant portion of our users use it because it's fun and it's not a complete waste of time". After six months of studying French with Duolingo, von Ahn demonstrated a lack of basic verb tenses when asked to describe his weekend in French, "mangling his tenses." Bob Meese, Duolingo's chief revenue officer, did not immediately understand the spoken question "¿Hablas español?" after six months of Duolingo Spanish study.[1]

Language coach and podcaster Kersten Cable has criticized the app for "its impractical vocabulary, its insistence upon one acceptable translation per sentence prompt, and its lack of explanation for incorrect answers",[79] describing Duolingo's method as "you learn by parroting phrases without even beginning to cover the background stories that grammar and pragmatics tell."[80] Linguist Steven Sacco at San Diego State University attempted to test Duolingo's claim of "34 hours of Duolingo are equivalent to a full university semester of language education"[81] by completing a course in Swedish and taking a standardized elementary exam ultimately receiving a failing grade.[79] Sacco suggested some use for Duolingo as helpful for learning vocabulary only in addition to immersion environments like a classroom.[79] Both Sacco and Cable added that Duolingo's translation method of teaching is ultimately inferior to learning a language in an immersion environment.

Language courses

Courses for English speakers

As of 24 June 2020, 36 courses are available to the public in English, three of which are constructed languages, and those three include two fictional languages.[82][83][84] In this list, the courses are ordered by number of active learners.

Complete

Courses available in other languages

As of 28 June 2020, the following languages are available to speakers of languages other than English:[90]

Language courses

Courses for English speakers

As of 24 June 2020, 36 courses are available to the public in English, three of which are constructed languages, and those three include two fictional languages.[99][100][101] In this list, the courses are ordered by number of active learners.

Complete

Beta

Alpha

As of 7 October 2020, three courses for English speakers are in development (ordered by progression percentage towards completion according to the Weekly Incubator Update[109])

Courses available in other languages

As of 28 June 2020, the following languages are available to speakers of languages other than English:[113]

(#) = course still in development (β) = Course still in beta version

Number of languages available for speakers of 'x' language on the app and on the website

Rank
Number of languages
available for speakers of:		 On app On website
1 Englisch 36 39 (Haitian Creole, Maori and Yiddish in the incubator)
2 Spanish 10 12 (Yucatec and K'iche in incubator)
3 Chinese 6 7 (German in incubator)
4 Portuguese 6 6
5 French 5 6 (Esperanto in beta)
6 Arabic 4 5 (Spanish in incubator)
7 Russian 4 5 (Swedish in incubator)
8 Turkish 3 5 (French and Swedish in incubator)
9 Italian 3 (Spanish not available on app) 4
10 German 3 3
11 Japanese 2 2
12 Dutch 2 3 (French in incubator)
13 Czech 1 1
14 Greek 1 1
15 Hindi 1 1
16 Hungarian 1 2 (German in incubator)
17 Indonesian 1 1
18 Korean 1 1
19 Polish 1 1
20 Romanian 1 1
21 Thai 1 1
22 Ukrainian 1 1
23 Vietnamese 1 1
24 Bengali - 1 (English in incubator)
25 Punjabi (Gurmukhi) - 1 (English in incubator)
26 Tagalog - 1 (English in incubator)
27 Tamil - 1 (English in incubator)
28 Telugu - 1 (English in incubator)

List of courses by number of learners

As of March 2020, 94 courses are available to start learning, and 10 are available to be notified when they are released.[122]

Rank Teaching For Speakers of Number of Learners Release date[123]
1 Englisch Spanish 27,600,000[124] 2012-03-30 – 30 March 2012
2 Spanish Englisch 24,200,000[125] 2011-11-30 – 30 November 2011
3 French Englisch 13,600,000[126] 2012-06-19 – 19 June 2012
4 Englisch Portuguese 10,800,000[127] 2012-10-30 – 30 October 2012
5 German Englisch 7,820,000[128] 2011-11-30 – 30 November 2011
6 Japanese Englisch 6,430,000[129] 2017-05-18 – 18 May 2017
7 Englisch Russian 5,720,000[130] 2015-11-02 – 2 November 2015
8 Italian Englisch 5,300,000[131] 2012-11-13 – 13 November 2012
9 Englisch Arabic 4,520,000[132] 2014-05-09 – 9 May 2014
10 Englisch French 4,430,000[133] 2013-05-07 – 7 May 2013
11 French Spanish 3,880,000[134] 2014-01-10 – 10 January 2014
12 Korean Englisch 3,670,000[135] 2017-10-10 – 10 October 2017
13 Chinese Englisch 3,560,000[136] 2017-11-15 – 15 November 2017
14 Russian Englisch 3,300,000[137] 2015-11-02 – 2 November 2015
16 Englisch Chinese 3,190,000[138] 2014-04-11 – 11 April 2014
15 Englisch Turkish 3,050,000[139] 2013-12-29 – 29 December 2013
17 Spanish Portuguese 2,650,000[140] 2014-03-09 – 9 March 2014
18 Italian Spanish 2,510,000[141] 2014-09-15 – 15 September 2014
19 Englisch German 2,280,000[142] 2013-11-27 – 27 November 2013
20 Portuguese Englisch 2,240,000[143] 2012-10-30 – 30 October 2012
21 Englisch Vietnamese 2,150,000[144] 2014-06-10 – 10 June 2014
22 Englisch Italian 2,120,000[145] 2012-11-24 – 24 November 2012
23 Portuguese Spanish 2,110,000[146] 2014-02-01 – 1 February 2014
24 Englisch Polish 1,660,000[147] 2014-01-19 – 19 January 2014
25 German Spanish 1,590,000[148] 2014-05-19 – 19 May 2014
26 Englisch Hindi 1,520,000[149] 2014-04-21 – 21 April 2014
27 Turkish Englisch 1,450,000[150] 2013-12-29 – 29 December 2013
28 Spanish French 1,430,000[151] 2014-05-21 – 21 May 2014
29 Arabic Englisch 1,410,000[152] 2019-06-25 – 25 June 2019
30 French Portuguese 1,400,000[153] 2015-03-12 – 12 March 2015
31 Dutch Englisch 1,350,000[154] 2014-07-16 – 16 July 2014
32 Swedish Englisch 1,190,000[155] 2014-11-17 – 17 November 2014
33 Englisch Japanese 1,170,000[156] 2014-03-03 – 3 March 2014
34 Englisch Indonesian 1,140,000[157] 2014-04-23 – 23 April 2014
35 Spanish German 1,080,000[158] 2015-09-01 – 1 September 2015
36 Hindi Englisch 1,070,000[159] 2018-07-18 – 18 July 2018
37 Greek Englisch 1,040,000[160] 2016-08-30 – 30 August 2016
38 Japanese Chinese 958,000[161] 2019-04-24 – 24 April 2019
39 Englisch Romanian 942,000[162] 2014-02-04 – 4 February 2014
40 Irish Englisch 924,000[163] 2014-08-25 – 25 August 2014
41 German Russian 887,000[164] 2014-03-26 – 26 March 2014
42 Englisch Dutch 879,000[165] 2013-12-23 – 23 December 2013
43 Polish Englisch 877,000[166] 2015-12-10 – 10 December 2015
44 High Valyrian Englisch 875,000[167] 2017-07-12 – 12 July 2017
45 Norwegian Englisch 841,000[168] 2015-05-21 – 21 May 2015
46 Hebrew Englisch 814,000[169] 2016-06-21 – 21 June 2016
47 Englisch Czech 803,000[170] 2014-10-17 – 17 October 2014
48 Italian Portuguese 765,000[171] 2017-06-13 – 13 June 2017
49 French Arabic 761,000[172] 2016-02-02 – 2 February 2016
50 French German 750,000[173] 2014-03-31 – 31 March 2014
51 Englisch Hungarian 713,000[174] 2014-01-08 – 8 January 2014
52 Russian Spanish 706,000[175] 2018-06-20 – 20 June 2018
53 Catalan Spanish 679,000[176] 2015-11-19 – 19 November 2015
54 Latin Englisch 676,000[177] 2019-08-28 – 28 August 2019
55 German Portuguese 669,000[178] 2015-09-15 – 15 September 2015
56 Englisch Korean 632,000[179] 2014-05-26 – 26 May 2014
57 French Russian 620,000[180] 2016-02-18 – 18 February 2016
58 Vietnamese Englisch 583,000[181] 2016-04-21 – 21 April 2016
59 Englisch Ukrainian 565,000[182] 2014-08-12 – 12 August 2014
60 Italian French 562,000[183] 2014-11-06 – 6 November 2014
61 Korean Chinese 559,000[184] 2019-04-24 – 24 April 2019
62 Hawaiian Englisch 554,000[185] 2018-10-05 – 5 October 2018
63 German French 550,000[186] 2015-10-14 – 14 October 2015
64 Spanish Russian 544,000[187] 2016-03-02 – 2 March 2016
65 German Turkish 538,000[188] 2015-12-14 – 14 December 2015
66 Dänisch Englisch 506,000[189] 2014-08-25 – 25 August 2014
67 Romanian Englisch 438,000[190] 2016-11-15 – 15 November 2016
68 Czech Englisch 416,000[191] 2017-09-05 – 5 September 2017
69 Spanish Chinese 406,000[192] 2016-07-06 – 6 July 2016
70 German Arabic 392,000[193] 2016-03-07 – 7 March 2016
71 Welsh Englisch 389,000[194] 2016-01-26 – 26 January 2016
72 Indonesian Englisch 387,000[195] 2018-08-15 – 15 August 2018
73 French Italian 364,000[196] 2015-10-08 – 8 October 2015
74 Swahili Englisch 358,000[197] 2017-02-20 – 20 February 2017
75 Klingon Englisch 344,000[198] 2018-03-15 – 15 March 2018
76 Englisch Thai 337,000[199] 2017-05-10 – 10 May 2017
77 German Italian 316,000[200] 2017-01-09 – 9 January 2017
78 Hungarian Englisch 314,000[201] 2016-06-30 – 30 June 2016
79 Ukrainian Englisch 308,000[202] 2015-05-21 – 21 May 2015
80 Russian Turkish 293,000[203] 2018-02-08 – 8 February 2018
81 Navajo Englisch 292,000[204] 2018-10-05 – 5 October 2018
82 Esperanto Englisch 282,000[205] 2015-05-28 – 28 May 2015
83 Portuguese French 279,000[206] 2017-01-30 – 30 January 2017
84 Englisch Greek 255,000[207] 2014-04-25 – 25 April 2014
85 Esperanto Spanish 254,000[208] 2016-10-26 – 26 October 2016
86 Guarani Spanish 250,000[209] 2016-08-30 – 30 August 2016
87 French Chinese 237,000[210] 2019-04-24 – 24 April 2019
88 Esperanto Portuguese 216,000[211] 2018-05-15 – 15 May 2018
89 Scottish Gaelic Englisch 167,000[212] 2019-11-27 – 27 November 2019
90 Swedish Arabic 147,000[213] 2016-03-01 – 1 March 2016
91 Italian Chinese 83,800[214] 2019-04-24 – 24 April 2019
92 Spanish Italian 68,800[215] 2018-08-22 – 22 August 2018
93 Chinese Japanese 48,500[216] 2019-11-21 – 21 November 2019
94 Swedish Spanish 31,000[217] 2019-11-30 – 30 November 2019
95 German Dutch 19,300[218]

List of courses in beta

As of 7 May 2020, 7 courses are in the beta phase on Duolingo.[219] Date courses started development were obtained from the Duolingo Wiki.[220]

Rank Teaching For Speakers of Number of Learners Date courses started development Release date into Beta
1 Korean Chinese 1,090,000[221] 2018-09-10 – 10 September 2018 2019-04-24 – 24 April 2019
2 Spanish Chinese 423,000[222] 2016-07-06 – 6 July 2016 2018-06-25 – 25 June 2018
3 Hungarian Englisch 318,000[223] 2014-03-12 – 12 March 2014 2016-06-30 – 30 June 2016
4 Klingon Englisch 297,000[224] 2015-04-09 – 9 April 2015 2018-03-15 – 15 March 2018
5 Navajo Englisch 286,000[225] 2018-08-23 – 23 August 2018 2018-10-05 – 5 October 2018
6 Esperanto Portuguese 207,000[226] 2017-03-13 – 13 March 2017 2018-05-15 – 15 May 2018
7 Italian Chinese 136,000[227] 2018-09-10 – 10 September 2018 2019-04-24 – 24 April 2019

List of courses being created

As of 24 June 2020, 20 courses are currently being developed on Duolingo.[219] Percentages are based on jrikhal's Weekly Incubator Summary.[228]

Rank by
Estimated
Completion 		Teaching For
Speakers of 		Percent
completed 		Date courses started
development [220] 		Estimated
completion date 		Number of Contributors
1 Englisch Tamil 82% 2016-06-01 – 1 June 2016 2020-08-01 – 1 August 2020 2[229]
2 Englisch Bengali 79% 2016-06-02 – 6 June 2016 2022-02-21 – 21 February 2022 2[230]
3 Yiddish Englisch 78% 2015-02-19 – 19 February 2015 2020-12-31 – 31 December 2020 9[231]
4 Swedish Russian 66% 2015-02-18 – 18 February 2015 2021-04-24 – 24 February 2021 0[232]
5 Englisch Tagalog 49% 2016-08-30 – 30 August 2016 2020-09-01 – 1 September 2020 2[233]
6 Spanish Arabic 30% 2016-09-12 – 12 September 2016 9999-12-31 – 31 December 9999 3[234]
7 Englisch Punjabi (Gurmakhi) 29% 2016-12-08 – 8 December 2016 2019-07-08 – 8 July 2019 2[235]
8 Esperanto French 2020-07-01 – 1 July 2020 10[236]
9 French Turkish 28% 2015-10-27 – 27 October 2015 2022-02-19 – 19 February 2022 0[237]
11 Finnish Englisch 18% 2019-04-17 – 17 April 2019 2020-12-31 – 31 December 2020 7[238]
12 Haitian Creole Englisch 18% 2017-01-27 – 27 January 2017 2020-07-01 – 1 July 2020 5[239]
13 French Dutch 2020-12-20 – 20 December 2020 9[240]
14 Esperanto Chinese 2020-05-06 – 6 May 2020 12[241]
15 Māori Englisch 1% 2020-02-12 – 12 February 2020 2021-02-21 – 21 February 2021 3[242]
16 German Hungarian 0.5% 2019-06-18 – 18 June 2019 2020-03-25 – 25 March 2020 5[243]
17 Italian German 0.25% 2021-03-12 – 12 March 2021 2[244]
18 German Chinese 0% 2018-09-10 – 10 September 2018 2020-06-30 – 30 June 2020 1[245]
19 Englisch Hebrew 0% 2019-11-03 – 3 November 2019 2020-04-12 – 12 April 2020 0[246]
20 Yucatec Spanish 0% 2020-02-12 – 12 February 2020 2021-02-12 – 12 February 2021 4[247]
21 K'iche' Spanish 0% 2020-02-12 – 12 February 2020 2021-02-12 – 12 February 2021 0[247]
22 Chinese Korean 2020-10-14 – 14 October 2020 1[247]

Chart of Courses

German x
Arabic x
Bengali
Czech x
Chinese x
Korean x
Spanish x
French x
Greek x
Hindi x
Hungarian x
Indonesian x
Englisch x
Italian x
Japanese x
Dutch x
Punjabi
Polish x
Portuguese x
Romanian x
Russian x
Tagalog
Tai
Tamil
Telugu
Turkish x
Ukrainian x
Vietnamese x

See also

References

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