Duolingo EN from EN versions:

Path Versions, all CEFR:
1.0: 2024-05-01: 196 Skills (196 Different Lessons) (CEFR B2) (200 Units)
1.1: 2024-05-10: 196 Skills (196 Different Lessons) (CEFR B2) (175 Units)
1.1: 2024-06-22: 196 Skills (264 Different Lessons) (CEFR B2) (175 Units)
2.0: 2024-12-20: 197 Skills, 194 stories and 67 radios (458 Different Lessons) (CEFR B2) (175 Units)
2.1: 2025-01-20: 197 Skills, 205 stories and 67 radios, with videocalls (469 Different Lessons) (CEFR B2) (175 Units)
2.x: ?
3.0: 2025-02-10: 197 Skills, 200 stories and 67 radios (464 Different Lessons) (CEFR B2) (175 Units)
3.x: ?
3.8: 2025-03-12: 197 Skills, 569 stories and 1260 radios (2026 Different Lessons) (CEFR B2) (175 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, 2025-03-17.