Compare software

KeyVault OTP AuthenticatorProton Authenticator
Freemium

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

 Free

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

Linux, iOS Windows, Linux, Android, iOS
  • Adds codes by QR scan or manual entry
  • Import and export for moving between devices
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • Proprietary and closed source
  • Customization features need the paid Pro tier
  • 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: Proprietary License: GPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked October 1, 2026

Checked September 21, 2026

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