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Proton AuthenticatorAuthy
Free

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

 Free

Free to use for consumers.

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

Checked September 21, 2026

Checked September 22, 2026

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