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WhatsAppSignal
Free

Free to use for personal messaging and calls.

 Free

Free; developed by a nonprofit funded by grants and donations

Windows, macOS, Android, iOS, Web Android, iOS, Windows, macOS, Linux
  • End-to-end encrypted messages and calls
  • Available on phones, desktop and the web
  • End-to-end encryption on every message and call using the open source Signal Protocol
  • No ads, affiliate marketers or tracking
  • Proprietary and tied to a phone number account
  • Relies on a central service run by the developer
  • 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
Downloadable app, Web application Downloadable app
Closed source Open source
License not stated License: AGPL-3.0
Account needed Account needed
Needs internet Needs internet

Checked September 24, 2026

Checked September 20, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.