Chrome App不算Desktop Client。
Facebook Messenger用的是MQTT协议，居然还是ISO标准……
QQ For Linux 这种古董还是算了……
Encrypted 指 End-to-End Encrypted。
Skype for Linux? 呵呵呵……
| App | Open Proto. | Web | Windows | *nix | Open Source | Android | Encrypted | Distributed | Group |
|---|---|---|---|---|---|---|---|---|---|
| Google Hangouts | No | Yes | No | No | No | Yes | No | No | Yes |
| Telegram | Yes | Yes | Yes | Yes | Yes | Yes | Opt | No | Yes |
| Signal | Yes | No | No | No | Yes | Yes | Yes | No | Yes |
| Yes | Yes | Yes | No | Yes | Yes | No | Yes | ||
| Facebook Messenger | Yes | Yes | Yes | No | Yes | Opt | No | Yes | |
| iMessage | No | No | No | No | No | No | Yes | No | Yes |
| No | Yes | Yes | No | No | Yes | No | No | Yes | |
| No | Yes | Yes | 3rd-party | No | Yes | No | No | Yes | |
| Skype | No | Yes | Yes | No | No | Yes | No | No | Yes |
| Tox | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
