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AuthenticatorProton Authenticator
Free

Free and open source under the GPL 3.0 or later.

 Free

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

Linux Windows, Linux, Android, iOS
  • Supports both TOTP and HOTP codes
  • Fits in with the GNOME desktop
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • Built for Linux desktops only
  • Codes live on the desktop rather than on a phone you carry
  • 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: GPL-3.0-or-later License: GPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 24, 2026

Checked September 21, 2026

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