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Proton AuthenticatorKeyVault OTP Authenticator
Free

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

 Freemium

Free to use, with a paid Pro upgrade for themes, icons and advanced organization.

Windows, Linux, Android, iOS Linux, iOS
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • Adds codes by QR scan or manual entry
  • Import and export for moving between devices
  • Sync requires a Proton account
  • Keeping codes on the same desktop you log in from weakens second-factor separation
  • Proprietary and closed source
  • Customization features need the paid Pro tier
Downloadable app Downloadable app
Open source Closed source
License: GPL-3.0 License: Proprietary
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked October 1, 2026

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