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
WhatsApp 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
QQ No Yes Yes No No Yes No No Yes
WeChat 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