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FlauthProton Authenticator
Free

Free and open source under the MIT licence.

 Free

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

Windows, macOS, Linux, Android, Command line Windows, Linux, Android, iOS
  • Same authenticator on Android and all three desktop systems
  • Command-line tool for reading codes in a terminal
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • Small, young project with a single main developer
  • No iOS app listed among the downloads
  • Sync requires a Proton account
  • Keeping codes on the same desktop you log in from weakens second-factor separation
Downloadable app Downloadable app
Open source Open source
License: MIT License: GPL-3.0
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked September 21, 2026

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