Openlet vs Retain
| Openlet | Retain | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | Free |
| Open source | No | No |
| Platforms | Web | Web, iOS, Android |
| Free plan | Yes | Yes |
| Adaptive review | — | Yes |
| Source formats | — | mixed |
| Card formats | — | mixed |
| Study modes | — | mixed |
| Mobile apps | — | Yes |
Both are listed in Best AI Flashcard Generators, Best Flashcard Apps. On The Geeks Club, Retain scores higher on our published basis.