GroupCal vs Mozilla Thunderbird
| GroupCal | Mozilla Thunderbird | |
|---|---|---|
| Free plan | Yes | Yes |
| Free trial | No | No |
| Paid from | $15/mo | Free |
| Open source | No | Yes |
| Platforms | Android, iOS | Android, Linux, macOS, Windows |
| Free plan | Yes | Yes |
| Shared calendars | Yes | — |
| Calendar sync | two_way | — |
| Mobile apps | ios and android | Android |
Both are listed in Best Calendar Apps. On The Geeks Club, Mozilla Thunderbird scores higher on our published basis.