Calendar 366 vs Proton Calendar
| Calendar 366 | Proton Calendar | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | Free |
| Open source | No | No |
| Platforms | iOS | Android, iOS |
| Free plan | Yes | Yes |
| Shared calendars | Yes | Yes |
| Calendar sync | two_way | one_way |
| Mobile apps | ios | ios and android |
| Video meeting support | Yes | Yes |
| Scheduling links | — | Yes |
Both are listed in Best Calendar Apps. On Samsung Mobile US Press, Proton Calendar scores higher on our published basis.