Duolingo YI from EN versions:

Trees:
v0: 2015-02-19  ? (Beta)
v1: 2021-03-21, 95 Skills (95 Different Lessons) (Beta)
v2: 2021-04-06, 94 Skills (94 Different Lessons) (Beta)

Paths:
1.0: 2022-09-10, 94 Skills (94 Different Lessons) (61 units)
1.2: 2023-07-30, 94 Skills (94 Different Lessons) (62 units)
1.3: 2023-09-10, 94 Skills (94 Different Lessons) (62 units)
1.4: 2024-05-01, 94 Skills (94 Different Lessons) (107 units)


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

Edited by Mat!/Ozone, 2024-05-02.