Signal vs Siskin IM
| Signal | Siskin IM | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | No | No |
| Paid from | Free | — |
| Open source | No | No |
| Platforms | Android, iOS, Linux, macOS, Windows | iOS, macOS |
| Free plan | Yes | Yes |
| Paid from | 1.99 /mo | — |
| Encryption coverage | default | mixed |
| Maximum group size | 1,000 members | — |
| Linked device limit | 5 devices | — |
| Desktop app | Yes | Yes |
| Voice and video calls | Yes | Yes |
| Disappearing messages | Yes | — |
| Encrypted backups | end_to_end | — |
Both are listed in Best Encrypted Messaging Apps. On Samsung Mobile US Press, Signal scores higher on our published basis.