InstaCal vs Proton Calendar
| InstaCal | Proton Calendar | |
|---|---|---|
| Free plan | No | Yes |
| Paid from | $29.99/mo | Free |
| Platforms | iOS | Android, iOS |
| Free plan | No | Yes |
| Scheduling links | No | Yes |
| Calendar sync | two_way | one_way |
| Mobile apps | ios | ios and android |
| Video meeting support | Yes | Yes |
| Shared calendars | Yes |
Listed together in Best Calendar Apps