Real-Time Communication

Discover secure and private ways to communicate with others online without letting any third parties read your messages.

Encrypted Instant Messenger

Signal

Signal Signal is a mobile app developed by Open Whisper Systems. The app provides instant messaging, as well as voice and video calling. All communications are end-to-end encrypted. Signal is free and open source. VoIP


Wire

Wire A free software End-to-End Encrypted chatting application that supports instant messaging, voice, and video calls. Full source code is available. Warning VoIP


Complete Comparison

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Video/Voice Calling

Linphone

Linphone Linphone is an open source SIP Phone and a free voice over IP service, available on mobile and desktop environments and on web browsers. It supports ZRTP for end-to-end encrypted voice and video communication.


Mumble

Mumble Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming. Note that while Mumble doesn't log messages or record by default, it's missing end-to-end encryption, so self-hosting is recommended.


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Team Chat Platforms

Riot.im (Matrix)

Riot.im (Matrix) Riot.im is a federated free-software messaging application based on the Matrix protocol, a recent open protocol for real-time communication offering optional E2E encryption. It also has bridging functionality, allowing you to connect to other chat protocols such as IRC or Telegram. Experimental E2EE


Rocket.chat

Rocket.chat Rocket.chat is an self-hostable open source platform for team communication. It has optional federation and experimental E2EE. Experimental E2EE


Keybase

Keybase Keybase provides a hosted team chat with end-to-end encryption. It has also been indepedently audited (PDF). Warning


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