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Microsoft AuthenticatorProton Authenticator
Free

Free app from Microsoft for Android and iOS.

 Free

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

Android, iOS Windows, Linux, Android, iOS
  • Passwordless sign-in for Microsoft and work accounts
  • Commonly required by employers using Microsoft sign-in
  • End-to-end encrypted sync between devices, which most free authenticators lack
  • Apps for Android, iOS, Windows, Linux and macOS
  • Mobile only, with no desktop app
  • Most useful inside the Microsoft account ecosystem
  • Sync requires a Proton account
  • Keeping codes on the same desktop you log in from weakens second-factor separation
Downloadable app Downloadable app
Closed source Open source
License not stated License: GPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 23, 2026

Checked September 21, 2026

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