imo vs Threema
| imo | Threema | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | Yes |
| Paid from | — | $3/mo |
| Open source | No | No |
| Platforms | Web, Windows, macOS, iOS, Android | Android, api, iOS, Linux, macOS, self-hosted, Web, Windows |
| Free plan | Yes | No |
| Encryption coverage | mixed | default |
| Maximum group size | 5,000 members | — |
| Desktop app | Yes | Yes |
| Voice and video calls | Yes | Yes |
| Disappearing messages | Yes | Yes |
| Linked device limit | — | 2 devices |
| Encrypted backups | — | end_to_end |
Both are listed in Best Encrypted Messaging Apps. On Inferse, Threema scores higher on our published basis.