The following is a table of courses currently available (green) or being created (gray) on Duolingo. A description of what each specific course phase ("φ") means can be found here. For courses developed in-house by Duolingo staff the dates presented are estimates.
| Languages | φ | Date♠ entering phase | Days in phase | |||||
|---|---|---|---|---|---|---|---|---|
| For (L1) | Teaching |  |  |  | | | + | |
 Arabic |  English | 3 | 2014-01-29 | 2014-05-09 | 2015-08-11 | 100 | 459 | 559 |
| Arabic |  French | 3 | 2015-10-15 | 2016-02-02 | 2016-05-30 | 110 | 118 | 228 |
| Arabic |  German | 3 | 2015-09-18 | 2016-03-07 | 2016-05-27 | 171 | 81 | 252 |
| Arabic |  Swedish | 3 | 2015-10-15 | 2016-03-01 | 2016-11-17 | 138 | 261 | 399 |
 Chinese | English | 3 | 2013-10-25 | 2014-04-11 | 2016-03-03 | 168 | 692 | 860 |
| Chinese | French | 3 | 2015-02-18 | 2019-04-24[1] | 2019-06-04 | 1526 | 41 | 1567 |
| Chinese |  Japanese | 3 | 2018-09-13[1] | 2019-04-24[1] | 2019-06-07 | 223 | 44 | 267 |
| Chinese |  Korean | 3 | 2018-09-10[1] | 2019-04-24[1] | 2019-07-23 | 226 | 90 | 316 |
| Chinese |  Spanish | 3 | 2015-02-18 | 2016-07-06 | 2018-06-25 | 504 | 719 | 1223 |
 Czech | English | 3 | 2014-03-03 | 2014-10-17 | 2015-05-03 | 228 | 198 | 426 |
 Dutch | English | 3 | 2013-11-02 | 2013-12-23 | 2014-05-15 | 51 | 143 | 194 |
| Dutch | French | 3 | 2020-03-25 | 2020-09-30 | 2020-10-20 | 189 | 20 | 209 |
| Dutch | German | 3 | 2019-06-18 | 2020-03-17 | 2020-04-26 | 273 | 40 | 313 |
| English | Arabic | 3 | 2017-11-08 | 2019-06-25 | 2019-07-10 | 594 | 15 | 609 |
| English | Chinese | 3 | 2017-09-19 | 2017-11-15 | 2017-11-16 | 57 | 1 | 58 |
| English | Czech | 3 | 2015-07-06 | 2017-09-05 | 2018-05-29 | 792 | 266 | 1058 |
| English |  Danish | 3 | 2014-06-04 | 2014-08-25 | 2015-02-03 | 82 | 162 | 244 |
| English | Dutch | 3 | 2014-03-11 | 2014-07-16 | 2015-01-20 | 127 | 188 | 315 |
| English |  Esperanto | 3 | 2014-09-10 | 2015-05-28[2] | 2016-03-25 | 260 | 302 | 562 |
| English |  Finnish | 3 | 2019-04-17[3] | 2020-06-23 | 2021-01-31 | 433 | 222 | 655 |
| English | French | 3 | 2011-06-29[4] | 2012-06-19[5][6] | 2012-09-06 | 356 | 79 | 435 |
| English | German | 3 | 2011-11-30[7] | 2012-06-19[5][6] | 202 | |||
| English |  Greek | 3 | 2015-02-19 | 2016-08-30 | 2017-02-12 | 558 | 166 | 724 |
| English |  Hawaiian | 3 | 2018-06-15 | 2018-10-05 | 2019-04-18 | 112 | 195 | 307 |
| English |  Hebrew | 3 | 2015-03-25 | 2016-06-21 | 2017-04-23 | 454 | 306 | 760 |
| English |  High Valyrian | 3 | 2016-10-31 | 2017-07-12 | 2017-08-15 | 254 | 34 | 288 |
| English |  Hindi | 3 | 2015-06-10 | 2018-07-18 | 2018-09-18 | 1134 | 62 | 1196 |
| English |  Indonesian | 3 | 2015-12-02 | 2018-08-15 | 2019-06-05 | 987 | 294 | 1281 |
| English |  Irish | 3 | 2014-03-17[8] | 2014-08-25 | 2015-01-16 | 161 | 144 | 305 |
| English |  Italian | 3 | 2012-09-28[9] | 2012-11-13[6] | 2013-02-18 | 46 | 97 | 143 |
| English | Japanese | 3 | 2017-02-02 | 2017-10-11[10] | 2018-05-17 | 251 | 218 | 469 |
| English | Korean | 3 | 2016-02-04 | 2017-10-11[11] | 2018-05-17 | 615 | 218 | 833 |
| English |  Latin | 3 | 2019-01-25[1][12] | 2019-08-28[13] | 2020-03-14 | 215 | 199 | 414 |
| English |  Norwegian | 3 | 2015-01-20 | 2015-05-21 | 2015-08-11 | 121 | 82 | 203 |
| English |  Polish | 3 | 2014-03-12 | 2015-12-10 | 2016-02-02 | 638 | 54 | 692 |
| English |  Portuguese | 3 | 2012 | 2012-10-30[6] | 2013-04-25 | 177 | ||
| English |  Romanian | 3 | 2014-03-12 | 2016-11-15 | 2017-06-12 | 979 | 209 | 1188 |
| English |  Russian | 3 | 2014-03-11 | 2015-11-02 | 2016-03-17 | 601 | 136 | 737 |
| English |  Scottish Gaelic | 3 | 2019-07-17 | 2019-11-26 | 2019-12-10 | 132 | 14 | 146 |
| English | Spanish | 3 | 2011-11-30[7] | 2012-06-19[5][6] | 202 | |||
| English |  Swahili | 3 | 2015-10-30 | 2017-02-20 | 2018-02-03 | 479 | 348 | 827 |
| English | Swedish | 3 | 2014-05-30 | 2014-11-17 | 2015-01-23 | 171 | 67 | 238 |
| English |  Turkish | 3 | 2014-03-12 | 2015-03-23 | 2015-06-14 | 376 | 83 | 459 |
| English |  Ukrainian | 3 | 2014-08-19 | 2015-05-21 | 2017-02-12 | 275 | 633 | 908 |
| English |  Vietnamese | 3 | 2015-01-07 | 2016-04-21 | 2016-10-10 | 470 | 172 | 642 |
| English |  Welsh | 3 | 2015-10-08 | 2016-01-26 | 2016-07-02 | 110 | 158 | 268 |
| French | English | 3 | 2012 | 2013-05-07[14] | 2013-08-14 | 99 | ||
| French | German | 3 | 2015-02-03 | 2015-10-14 | 2016-03-19 | 253 | 157 | 410 |
| French | Italian | 3 | 2014-08-12 | 2014-11-06 | 2015-10-07 | 86 | 335 | 421 |
| French | Portuguese | 3 | 2015-08-17 | 2017-01-30 | 2017-05-20 | 532 | 110 | 642 |
| French | Spanish | 3 | 2014-01-21 | 2014-05-21 | 2014-09-16 | 120 | 118 | 238 |
| German | English | 3 | 2013-10-09[15] | 2013-11-27[16] | 2014-01-11[17] | 49 | 45 | 94 |
| German | French | 3 | 2014-01-27 | 2014-03-31 | 2015-01-27 | 63 | 302 | 365 |
| German | Spanish | 3 | 2015-01-07 | 2015-09-01 | 2015-11-29 | 237 | 89 | 326 |
| Greek | English | 3 | 2014-02-18 | 2014-04-25 | 2014-12-12[18] | 66 | 231 | 297 |
| Hindi | English | 3 | 2014-01-24 | 2014-04-21 | 2015-01-26 | 87 | 280 | 367 |
 Hungarian | English | 3 | 2013-11-15 | 2014-01-08 | 2014-12-10[18] | 54 | 336 | 390 |
| Indonesian | English | 3 | 2013-11-07 | 2014-04-23 | 2015-06-07 | 167 | 410 | 577 |
| Italian | English | 3 | 2012 | 2012-11-24[19] | 2013-01-15 | 52 | ||
| Italian | French | 3 | 2014-12-08[20] | 2015-10-08 | 2016-01-13 | 304 | 97 | 401 |
| Italian | German | 3 | 2014-09-08 | 2017-01-09 | 2017-06-28 | 854 | 170 | 1024 |
| Italian | Spanish | 3 | 2014-12-08[18] | 2018-08-22 | 2019-08-09 | 1353 | 352 | 1705 |
| Japanese | English | 3 | 2013-10-25 | 2014-03-03 | 2016-03-03 | 129 | 731 | 860 |
| Korean | English | 3 | 2014-01-08 | 2014-05-26 | 2015-11-16 | 138 | 539 | 677 |
| Polish | English | 3 | 2013-10-25 | 2014-01-19 | 2014-06-30 | 86 | 162 | 248 |
| Portuguese | English | 3 | 2012-08-28 | 2012-10-30[21] | 2013-05 [22] | 63 | ||
| Portuguese | French | 3 | 2014-09-08 | 2015-03-12 | 2015-05-24 | 185 | 73 | 258 |
| Portuguese | German | 3 | 2015-01-28 | 2015-09-15 | 2015-12-25 | 230 | 101 | 331 |
| Portuguese | Italian | 3 | 2015-08-17 | 2017-06-13 | 2018-04-21 | 666 | 312 | 978 |
| Portuguese | Spanish | 3 | 2014-02-10 | 2014-03-09 | 2015-04-27 | 27 | 414 | 441 |
| Romanian | English | 3 | 2013-12-11 | 2014-02-04 | 2014-06-30 | 55 | 146 | 201 |
| Russian | English | 3 | 2013-10-25 | 2013-12-19 | 2014-11-06 | 55 | 322 | 377 |
| Russian | French | 3 | 2015-11-10 | 2016-02-18 | 2016-09-26 | 100 | 221 | 321 |
| Russian | German | 3 | 2014-01-21 | 2014-03-26 | 2015-03-05 | 64 | 344 | 408 |
| Russian | Spanish | 3 | 2015-04-27 | 2016-03-02 | 2016-05-07 | 310 | 66 | 376 |
| Spanish |  Catalan | 3 | 2015-05-13 | 2015-11-19 | 2016-04-27 | 190 | 160 | 350 |
| Spanish | English | 3 | 2011 | 2012-03-30[7] | 2012-06-19[5][6] | 81 | ||
| Spanish | Esperanto | 3 | 2015-10-16 | 2016-10-26 | 2017-06-26 | 376 | 243 | 619 |
| Spanish | French | 3 | 2013-12-10 | 2014-01-10 | 2014-05-16 | 31 | 126 | 157 |
| Spanish | German | 3 | 2014-02-03 | 2014-05-19 | 2014-12-17 | 105 | 212 | 317 |
| Spanish |  Guarani | 3 | 2015-10-08 | 2016-08-30 | 2018-08-13 | 327 | 713 | 1040 |
| Spanish | Italian | 3 | 2014-04-24 | 2014-09-15 | 2014-12-02 | 144 | 78 | 222 |
| Spanish | Portuguese | 3 | 2013-10-25 | 2014-02-01 | 2015-04-02 | 99 | 425 | 524 |
| Spanish | Russian | 3 | 2017-03-13 | 2018-06-20 | 2018-09-08 | 464 | 80 | 544 |
| Spanish | Swedish | 3 | 2019-01-11[1] | 2019-11-26 | 2020-03-21 | 319 | 116 | 435 |
 Thai | English | 3 | 2014-04-09 | 2017-05-10 | 2017-06-19 | 1127 | 40 | 1167 |
| Turkish | English | 3 | 2013-11-15 | 2013-12-29 | 2014-05-15 | 44 | 137 | 181 |
| Turkish | German | 3 | 2014-09-09 | 2015-12-14 | 2016-06-30 | 461 | 199 | 660 |
| Turkish | Russian | 3 | 2015-11-20 | 2018-02-08 | 2018-06-25 | 811 | 137 | 948 |
| Ukrainian | English | 3 | 2014-05-01 | 2014-08-12 | 2015-09-09 | 103 | 393 | 496 |
| Vietnamese | English | 3 | 2014-02-27 | 2014-06-10 | 2015-03-14 | 103 | 277 | 380 |
| Chinese | Italian | 2 | 2018-09-10[1] | 2019-04-24[1] | 226 | |||
| English |  Haitian Creole | 2 | 2017-01-27 | 2022-02-22 | 1852 | |||
| English | Hungarian | 2 | 2014-03-12 | 2016-06-30 | 841 | |||
| English |  Klingon | 2 | 2015-04-09 | 2018-03-15 | 1071 | |||
| English |  Navajo | 2 | 2018-08-23 | 2018-10-05 | 43 | |||
| English |  Yiddish | 2 | 2015-02-19 | 2021-04-06 | 2238 | |||
| French | Esperanto | 2 | 2020-03-03 | 2020-07-15 | 134 | |||
| Hungarian | German | 2 | 2020-03-25 | 2021-03-17 | 357 | |||
| Japanese | Chinese | 2 | 2019-07-30 | 2019-11-19 | 112 | |||
| Japanese | French | 2 | 2020-10-18 | 2021-06-11 | 236 | |||
| Portuguese | Esperanto | 2 | 2017-03-13 | 2018-05-15 | 428 | |||
| Arabic | Spanish | 1 | 2016-09-12 | |||||
 Bengali | English | 1 | 2016-06-02 | |||||
| Chinese | Esperanto | 1 | 2020-03-03 | |||||
| Chinese | German | 1 | 2018-09-10[1] | |||||
| English |  Māori | 1 | 2020-02-13 | |||||
| German | Italian | 1 | 2020-03-25 | |||||
 Punjabi | English | 1 | 2016-12-08 | |||||
| Russian | Swedish | 1 | 2015-02-18 | |||||
| Russian | Ukrainian | 1 | 2020-08-14 | |||||
 Tagalog | English | 1 | 2016-08-30 | |||||
 Tamil | English | 1 | 2016-06-01 | |||||
 Telugu | English | 1 | 2016-08-10 | |||||
| Turkish | French | 1 | 2015-10-27 | |||||
| English | Tamil | 0 | Ø[1][23] | |||||
| Korean | Chinese | 0 | 2020-??-?? | |||||
| Turkish | Swedish | 0 | Ø[1][24] | |||||
♠ Date format: YYYY-MM-DD
(est.) = Estimated
References[]
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Incubator's (internal) data.
- ↑ "Esperanto for English speakers now in Beta!". Duolingo. Retrieved 2015-05-28.
- ↑ Added to the Incubator before 2019-04-06 but entered Phase 1 only on 2019-04-17
- ↑ https://twitter.com/duolingo/status/86175833412218881
- ↑ 5.0 5.1 5.2 5.3 Duffy, Jill. "Duolingo: Learn a Language While Translating the Web". Pcmag.com. 2012-06-19. Retrieved 2014-07-21.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 "Duolingo turns two today!"
- ↑ 7.0 7.1 7.2 Von Ahn, Luis. "We have a blog!". Duolingo.tumblr.com. 2012-03-30. Retrieved 2019-04-06.
- ↑ Added to the Incubator without any contributors on 2014-03-17. Happy St. Patrick's Day! We're launching Irish in the Incubator to celebrate!.
First contributors added 2014-04-24. Welcome to the Incubator, Irish contributors!. - ↑ Doulingo's Facebook, Our newly-hired Italian team!.
- ↑ 2017-05-18: Release date on the iOS app, see "こんにちは Japanese!".
2017-10-10: Release date on the webversion, see "Japanese and Korean Surprise!". - ↑ 2017-xx-x: Release date on the iOS app.
2017-10-10: Release date on the webversion, see "Japanese and Korean Surprise!". - ↑ Incubator's page created on 2019-01-01. LATIN (for English) in the Incubator!
First contributors added on 2019-01-08. Latin has its first contributor!
Course (technically) entered Phase 1 only on 2019-01-25 - ↑ https://www.facebook.com/duolingo/photos/a.421213931256115/2837898439587640/?type=3&theater
- ↑ [jrikhal] Based on personal archive commenting on this day that this course was now available on Duo_s website. But not 100% (only 90%) it was for Beta Phase and not "out of Beta Phase"
- ↑ [jrikhal] There exist statistic graph for this course in the incubator starting on this date (no graph of any course start before so could be much older)
- ↑ [jrikhal] I received on this date a mail notification about "Now in beta: Learning English from German!", https://www.duolingo.com/comment/1112433. So it was probably released in Beta on this date or one-two days before.
- ↑ "English for German speakers out of beta", https://www.duolingo.com/comment/1465691
- ↑ 18.0 18.1 18.2 Weekly Incubator Update: Tracking Progress from December 7th to December 14th 2014 gives an estimation of this date. True date from jrikhal's personal archive
- ↑ Reddit, English for Italian Speakers now in Beta.
- ↑ L'8 ottobre il corso di francese per italiani è finalmente entrato in fase beta!
- ↑ Probably released in beta after PT for EN speakers
- ↑ Probably released in Phase 3 after PT for EN speakers
- ↑ Incubator's page created around 2021-01-08. Weekly Incubator Summary: 2021, Week 01
But the course is not in Phase 1. See details here. - ↑ Incubator's page created around 2019-03-03. Weekly Incubator Summary: 2019, Week 09
But the course is not in Phase 1. See details here.
