Duolingo ES from EN versions:

It's too difficult to identify all versions of this huge course!

Tree Versions:
v0: 2011-11-30, ? (beta)
2012-06-19, 61 Skills = Different Lessons)
2015-06-20, 113  "
2018-06-25, 159  "
2020-08-01, 178  "
2020-10-10, 193  "
2020-12-26, 204  "
2021-12-29, 214  "
2021-03-18, 229  "
2021-03-26, 243  "
2021-09-16, 268  "

Path Versions, all CEFR:
2022-08-10, 211 units (551 Different Lessons: 264 Skills, 287 Stories) (CEFR B2)
2022-08-11, 212 units (586 Different Lessons: 269 Skills, 317 Stories) (CEFR B2)
2022-09-10, 207 units (549 Different Lessons: 262 Skills, 287 Stories) (CEFR B2)
2022-11-11, 220 units (563 Different Lessons: 276 Skills, 287 Stories) (CEFR B2)
2023-03-10, 216 units (585 Different Lessons: 268 Skills, 317 Stories) (CEFR B2)
2023-03-12, 230 units (631 Different Lessons: 284 Skills, 347 Stories) (CEFR B2)
2023-08-13, 264 units (731 Different Lessons: 324 Skills, 407 Stories) (CEFR B2)
2023-09-20, 179 units (702 Different Lessons: 252 Skills, 346 Stories, 104 Radios) (CEFR B2)
2023-09-21, 205 units (779 Different Lessons: 286 Skills, 406 Stories, 87 Radios) (CEFR B2)
2024-03-20, 327 units (823 Different Lessons: 323 Skills, 396 Stories, 104 Radios) (CEFR B2)
2024-05-01, 285 units (779 Different Lessons: 286 Skills, 406 Stories, 87 Radios) (CEFR B2) [Schools]
2024-05-10, 286 units (823 Different Lessons: 323 Skills, 396 Stories, 104 Radios) (CEFR B2)
2024-05-10, 250 units (705 Different Lessons: 286 Skills, 315 Stories, 104 Radios) (CEFR B2) [Schools]
2024-09-20, 286 units (1132 Different Lessons: 323 Skills, 396 Stories, 355 Radios, 58 Adventures) (CEFR B2)
2025-02-02, 286 units (1276 Different Lessons: 323 Skills, 396 Stories, 499 Radios, 58 Adventures) (CEFR B2)
2025-02-20, 286 units (1936 Different Lessons: 323 Skills, 396 Stories, 1159 Radios, 58 Adventures) (CEFR B2)
2025-05-28, 286 units (2351 Different Lessons: 323 Skills, 811 Stories, 1159 Radios, 58 Adventures) (CEFR B2)
2025-08-20, 974 units (3220 Different Lessons: 984 Skills, 987 Stories, 1191 Radios, 58 Adventures) (CEFR B2)
2026-02-20, 991 units (3286 Different Lessons: 991 Skills, 987 Stories, 1250 Radios, 58 Adventures) (CEFR B2)

https://liuch.github.io/duolingo_courses_overview/
https://duolingo.fandom.com/wiki/Course_list
https://duolingodata.com/
https://ardslot.com/duolingocrowns.html

Edited by Mat!/Ozone, 2026-02-27.