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SignalSimpleX Chat
Free

Free; developed by a nonprofit funded by grants and donations

 Free

Free and open source under the AGPL 3.0. The company is funded by investment and…

Android, iOS, Windows, macOS, Linux Windows, macOS, Linux, Android, iOS, Command line
  • End-to-end encryption on every message and call using the open source Signal Protocol
  • No ads, affiliate marketers or tracking
  • No user identifier of any kind, so conversations cannot be correlated by account
  • Double ratchet encryption with an additional layer for the relay servers
  • Requires a phone number that can receive an SMS or phone call to register
  • Desktop app requires Signal to be installed on a phone first
  • Connecting means exchanging a link or QR code in person or elsewhere
  • No contact list means a lost device is a lost set of conversations unless backed up
Downloadable app Downloadable app
Open source Open source
License: AGPL-3.0 License: AGPL-3.0
Account needed No account needed
Needs internet Works offline

Checked September 20, 2026

Checked September 21, 2026

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