Threema vs Viber
| Threema | Viber | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | Yes | No |
| Paid from | $3/mo | Free |
| Open source | No | No |
| Platforms | Android, api, iOS, Linux, macOS, self-hosted, Web, Windows | Android, iOS, Linux, macOS, Windows |
| Free plan | No | Yes |
| Account requirement | none | phone |
| Encrypted backups | Yes | No |
| Desktop apps | Yes | Yes |
| Maximum group size | 256 members | 250 members |
| Multi-device support | Yes | Yes |
| Disappearing messages | Yes | Yes |
Both are listed in Best Secure Messaging Apps. On Freedom251, Viber scores higher on our published basis.