SimpleX Chat is a messaging platform that eliminates user identifiers entirely, using a decentralized protocol with end-to-end encryption based on the double-ratchet algorithm to ensure message privacy. Developers can use SimpleX Chat to build privacy-focused messaging applications across iOS, Android, and desktop platforms, or integrate its protocol into their own systems. The project is implemented in Haskell and provides open-source infrastructure for applications requiring strong cryptographic guarantees and minimal data collection.

1,185 open issues · last updated Jul 23, 2026