Duolingo HV from EN versions:

Trees:
v0: 2016-10-31  ? (Beta)
v1: 2017-07-12, 30 Skills (30 Different Lessons) (Beta)
v2: 2017-08-15, 33 Skills (33 Different Lessons)
v3: ?, 38 Skills (38 Different Lessons)
v4: 2022-07-23, 43 Skills (43 Different Lessons)


Paths:
1.0: 2022-09-10, 33 Skills (33 Different Lessons) (21 units)
2.0: 2023-08-20, 43 Skills (43 Different Lessons) (28 units)
2.1: 2023-09-10, 43 Skills (43 Different Lessons) (28 units)
2.2: 2024-05-01, 43 Skills (43 Different Lessons) (49 units)


tree_hv_en_v2_experiment
tree_hv_en_v3_experiment
tree_hv_en_v4_experiment

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.