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2FAuthProton 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…

Web, Self-hosted Windows, Linux, Android, iOS
  • Codes available from any device with a browser
  • Easy backup and restore of a standalone database
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • Requires running your own server
  • Fully localised only in English and French
  • Sync requires a Proton account
  • Keeping codes on the same desktop you log in from weakens second-factor separation
Self-hosted Downloadable app
Open source Open source
License: AGPL-3.0 License: GPL-3.0
Not stated if an account is needed No account needed
Not stated if it 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.