Duolingo IT from EN versions:

Trees:
v0: 2012-09-28  ? (Beta)
v0: 2012-11-13  ? (Beta)
v1: 2013-02-18, ?
v2: ?
v3: 66 Skills (66 Different lessons)

Paths:
1.0: 2022-09-10, 66 Skills (66 Different lessons) (51 Units)
1.1: 2022-10-10, 66 Skills and 51 stories (117 Different lessons) (51 Units)
2.0: 2022-11-15, 72 Skills and 51 stories (123 Different lessons) (57 Units)
3.0: 2022-12-01, 76 Skills (76 Different lessons) (58 Units)
4.0: 2023-06-01, 98 Skills (98 Different lessons) (66 Units)
4.1: 2023-06-10, 98 Skills and 20 stories (108 Different lessons) (66 Units)
4.2: 2023-06-10, 98 Skills and 51 stories (149 Different lessons) (72 Units)
2.1: 2023-09-10, 72 Skills and 54 stories (126 Different lessons) (58 Units)
2.2: 2023-12-10, 72 Skills and 86 stories (156 Different lessons) (56 Units)
4.3: 2024-02-08 98 Skills and 84 stories (182 Different lessons) (43 Units)
1.2: 2024-02-10 66 Skills and 57 stories (123 Different lessons) (43 Units)
1.3: 2024-05-01 66 Skills and 81 stories (147 Different lessons) (75 Units)

CEFR:
1.0: 2023-09-10, 98 skills and 84 stories (182 Different lessons) (CEFR A1) (79 Units)
2.0: 2023-10-10, 72 skills and 84 stories (156 Different lessons) (CEFR A1) (50 Units)
1.1: 2024-02-04, 98 skills and 67 stories (165 Different lessons) (CEFR A1) (79 Units)
3.0: 2024-02-04, 123 skills and 84 stories (207 Different lessons) (CEFR A1) (79 Units)
3.1: 2024-04-02, 123 skills and 67 stories (190 Different lessons) (CEFR A1) (79 Units)
1.2: 2024-05-01, 123 Skills and 67 stories (190 Different Lessons) (CEFR A1) (140 units)


tree_it_en_v1_experiment
tree_it_en_v2_experiment
tree_it_en_v3_experiment
tree_it_en_a1_1_existing
tree_it_en_a1_1_new
tree_it_en_a1_2_existing
tree_it_en_a1_2_existing_v2
tree_it_en_a1_2_new
tree_it_en_a1_2_new_launch

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, 2024-05-09.