Duolingo HE from EN versions:

Trees:
v0: 2015-03-25  ? (Beta)
v0: 2016-06-21, 70 Skills (70 Different Lessons) (Beta)
v1: 2017-04-23, 84 Skills (84 Different Lessons)

Paths:
1.0: 2022-09-10, 84 Skills (84 Different Lessons) (54 units)
1.1: 2023-09-10, 84 Skills (84 Different Lessons) (56 units)
1.2: 2024-05-01, 84 Skills (84 Different Lessons) (96 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.