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Ente AuthProton Authenticator
Free

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

 Free

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

Windows, macOS, Linux, Android, iOS, Web Windows, Linux, Android, iOS
  • End-to-end encrypted cloud backup at no cost
  • Clients on mobile, desktop and the web, all open source
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • Backup relies on an Ente account, even though the data is encrypted
  • Sync requires a Proton account
  • Keeping codes on the same desktop you log in from weakens second-factor separation
Downloadable app, Web application 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 September 22, 2026

Checked September 21, 2026

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