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Signal — open source alternative

Encrypted messaging for individuals and small groups.

Strengths

  • Gold-standard end-to-end encryption.
  • Non-profit governance.
  • Clean, minimal UX.

Weaknesses

  • Requires phone number for registration.
  • Self-hosting the server is effectively impossible in practice.
  • Not designed for large teams or admin controls.
License: AGPL-3.0 / GPL-3.0 Self-host difficulty: 5/5 Hosted cloud optionDesktop: Windows, macOS, LinuxMobile: iOS, Android

Official site · Source on GitHub

Ad slot — OSS middle

Signal is used as an alternative to

WhatsApp

Global mobile messaging.

See all alternatives →

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