Proton Authenticator
Proton's free, open-source 2FA app with end-to-end encrypted sync on phones, Apple Watch and desktop.
- Verified facts
- 4 of 4
- Alternatives ranked
- 5
- Approved reviews
- 0
- Visits sent from here
- 0
About Proton Authenticator
Proton Authenticator is a standalone two-factor app from Proton, the Swiss company behind Proton Mail, Pass and VPN. Launched in 2025, it is free and open source, and you can start using it without any account, phone number or email address. If you sign in with a Proton account, codes sync across devices with end-to-end encryption, and you can also make encrypted backups. It runs on iPhone, iPad, Apple Watch, Mac, Android, Windows and Linux, which is wider desktop coverage than most rivals, and codes work offline. Everyday touches include biometric unlock, search, custom icons and showing the next code before the current one expires. You can import codes from other authenticator apps when switching. Proton already includes TOTP codes in Proton Pass, so the separate app mainly appeals to people who want 2FA kept apart from their password manager. As a newer app, it has fewer advanced organisation features than long-running tools like Aegis, and sync requires a Proton account.
Best for: People who want free encrypted 2FA sync on phone and desktop from a privacy-focused company.
Pros and cons
What works
- Free and open source with no account required
- End-to-end encrypted sync across devices
- Desktop apps for Windows, Mac and Linux, plus Apple Watch
Why people leave
- Sync requires a Proton account
- Newer app with fewer organisation features
- No browser extension of its own
Top Proton Authenticator alternatives
See all 5- 1
Ente Auth66.5Similar encrypted sync plus a web app, and a self-hostable server.
- 2
2FAS Auth59.6Account-free mobile app with a browser extension.
- 3
Bitwarden Authenticator57.2Free, open-source mobile authenticator from another privacy-minded vendor.
- 4
Aegis Authenticator55.3Fully local, highly configurable vault for Android.
- 5
Proton Pass54.4Keep TOTP codes alongside your passwords in Proton's password manager.
Why people left Proton Authenticator
In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.
No switching stories yet. If you moved away from Proton Authenticator, review the app you switched to and tell us why.
Reviews
No approved reviews yet. How we verify reviewers
Write a review of Proton Authenticator
Proton Authenticator: common questions
Is Proton Authenticator free?
Yes, Proton Authenticator is free to use.
Is Proton Authenticator open source?
Yes.
What platforms does Proton Authenticator run on?
Proton Authenticator is available for iOS, Android, macOS, Windows and Linux.
What are the best alternatives to Proton Authenticator?
The highest-ranked Proton Authenticator alternatives right now are Ente Auth, 2FAS Auth and Bitwarden Authenticator. See the full ranked list for pricing, platforms and verified facts.