imo vs Threema
| imo | Threema | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | No | Yes |
| Paid from | Free | $3/mo |
| Open source | No | No |
| Platforms | Android, iOS, macOS, Web, Windows | Android, api, iOS, Linux, macOS, self-hosted, Web, Windows |
| Free plan | — | No |
| Account requirement | — | none |
| Encrypted backups | — | Yes |
| Desktop apps | — | Yes |
| Maximum group size | — | 256 members |
| Multi-device support | — | Yes |
| Disappearing messages | — | Yes |
Both are listed in Best Secure Messaging Apps. On Freedom251, imo scores higher on our published basis.