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AuthyProton Authenticator
Free

Free to use for consumers.

 Free

Free and open source under the GPL, with no advertising. A Proton account is used for…

Android, iOS Windows, Linux, Android, iOS
  • Encrypted backup and multi-device sync, which many authenticators lack
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • Desktop applications were retired; only mobile is supported
  • Account recovery is tied to a phone number, which is a known attack surface
  • Sync requires a Proton account
  • Keeping codes on the same desktop you log in from weakens second-factor separation
Downloadable app Downloadable app
Closed source Open source
License not stated License: GPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked September 21, 2026

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