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Proton AuthenticatorEnte Auth
Free

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

 Free

Free and open source, funded by the company's photo storage product.

Windows, Linux, Android, iOS Windows, macOS, Linux, Android, iOS, Web
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • End-to-end encrypted cloud backup at no cost
  • Clients on mobile, desktop and the web, all open source
  • Sync requires a Proton account
  • Keeping codes on the same desktop you log in from weakens second-factor separation
  • Backup relies on an Ente account, even though the data is encrypted
Downloadable app Downloadable app, Web application
Open source Open source
License: GPL-3.0 License: AGPL-3.0
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked September 22, 2026

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