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Pocket2FAProton Authenticator
Free

Free and open source under the AGPL-3.0 licence.

 Free

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

Android Windows, Linux, Android, iOS
  • Generates TOTP and Steam codes locally
  • Works offline after syncing
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • Needs a 2FAuth server to sync with
  • Small project with no GitHub releases
  • 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: AGPL-3.0 License: GPL-3.0
Not stated if an account is needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked September 21, 2026

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