eM Client vs Proton Calendar
| eM Client | Proton Calendar | |
|---|---|---|
| Free plan | Yes | Yes |
| Free trial | No | No |
| Paid from | $3.33/mo | Free |
| Open source | No | No |
| Platforms | Android, iOS, macOS, Windows | Android, iOS |
| Free plan | Yes | Yes |
| Paid from | $39.95/user/mo | — |
| Mobile apps | Android and iOS | ios and android |
| Shared calendars | — | Yes |
| Scheduling links | — | Yes |
| Calendar sync | — | one_way |
| Video meeting support | — | Yes |
Both are listed in Best Calendar Apps. On Freedom251, Proton Calendar scores higher on our published basis.