Duolingo ZH from EN versions:

Trees:
v0: 2013-10-25  ? (Beta)
v0: 2014-04-11  ? (Beta)
v1: 2016-03-03, 88 Skills (88 Different lessons)

Paths:
1.0: 2022-09-10, 88 Skills (88 Different lessons) (57 Units)
1.1: 2023-09-10, 88 Skills (88 Different lessons) (57 Units)
1.2: 2024-05-01, 88 Skills (88 Different lessons) (100 Units)
1.3: 2024-05-10, 88 Skills (88 Different lessons) (88 Units)

CEFR:
1.0: 2024-02-02, 67 skills (67 Different lessons) (CEFR A1) (43 Units)
1.1: 2024-05-01, 67 skills (67 Different lessons) (CEFR A1) (76 Units)
1.2: 2024-05-10, 67 skills (67 Different lessons) (CEFR A1) (67 Units)
2.0: 2025-03-12, 70 skills (70 Different lessons) (CEFR A1) (70 Units)
2.1: 2025-03-31, 70 skills + 185 Radios + 210 hanzis = 465 Different lessons (CEFR A1) (70 Units)
3.0: 2025-10-06, 130 skills + 185 Radios + 210 hanzis = 525 Different lessons (CEFR A2) (130 Units)
3.1: 2025-10-20, 130 skills + 185 Radios + 310 hanzis = 625 Different lessons (CEFR A2) (130 Units)
4.0: 2026-01-29, 630 skills + 185 Radios + 310 hanzis = 1125 Different lessons (CEFR B1) (630 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, 2026-01-29.