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