Duolingo ZH from AR versions:

0.1: 2024-12-10, 70 units (70 different lessons), CEFR A1, Beta
1.0 A/B: 2025-03-15, 70 units (70 different lessons), CEFR A1
1.0: 2025-04-16, 70 units (70 skills + 152 Radios = 222 different lessons), CEFR A1
2.0: 2025-10-06, 130 units (130 skills + 152 Radios = 282 different lessons), CEFR A2

Edited by Mat!/Ozone, 2025 10 08.