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Proton Authenticator

proton.me

Free plan WindowsmacOSLinuxiOSAndroid
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Spec score 8.8 #9 of 111 in Authenticator apps

What it is

Proton Authenticator generates time-based one-time codes for two-factor authentication, adding a code at login to help secure accounts. It can display codes without an internet connection, and a Proton Account is not required to use it. Signing in is optional and enables code syncing across devices. Users can import codes from Google Authenticator, 2FAS, Aegis Authenticator, Bitwarden Authenticator, Ente Auth, and LastPass Authenticator, then export their codes from the app. Backups can be stored locally or in the cloud, with end-to-end encrypted sync between devices. Proton says its servers cannot access synced data in unencrypted form; when sync is on, entries are protected with 256-bit AES-GCM. The app is open source, and its vault can be unlocked with face or fingerprint recognition. It is available for Android, iOS, Linux, macOS, and Windows; Android is also available through F-Droid. Proton Authenticator is free on all listed platforms, with no ads or tracking.

Spec sheet

Purpose
Proton Authenticator generates time-based, one-time 2FA codes on your device for an extra layer of account login security.Read 4 Oct 2026 · proton.me
Free plan
YesRead 21 Sep 2026 · proton.me
Security
Proton says that synced data is end-to-end encrypted and that its servers never access the unencrypted data.Read 4 Oct 2026 · proton.me
Support
The product page links to Proton product support.Read 4 Oct 2026 · proton.me
Headquarters
Plan-les-Ouates, Geneva, SwitzerlandRead 28 Sep 2026 · proton.me
Founded
2014Read 28 Sep 2026 · proton.me
Maker
Proton AG operates Proton services as a Swiss corporation and says Proton was launched in 2014.Read 4 Oct 2026 · proton.me
Account requirement
You can use the app without a Proton Account; signing in is optional for syncing codes across devices.Read 4 Oct 2026 · proton.me
App availability
Proton lists apps for Windows, macOS, Linux, iOS, and Android, with its Android app also available on F-Droid.Read 4 Oct 2026 · proton.me
Backup and sync
You can back up codes locally or in the cloud and sync them across devices with end-to-end encryption.Read 4 Oct 2026 · proton.me
Biometric unlock
The app supports unlocking its vault with face or fingerprint recognition.Read 4 Oct 2026 · proton.me
Code export
You can export your codes from Proton Authenticator.Read 4 Oct 2026 · proton.me
Code import
It supports importing codes from Google Authenticator, 2FAS, Aegis Authenticator, Bitwarden Authenticator, Ente Auth, and LastPass Authenticator.Read 4 Oct 2026 · proton.me
Code type
totpRead 21 Sep 2026 · proton.me
Encrypted backup
YesRead 21 Sep 2026 · proton.me
Encryption detail
When sync is enabled, entries are encrypted using 256-bit AES-GCM.Read 4 Oct 2026 · proton.me
Multi-device sync
YesRead 21 Sep 2026 · proton.me
Offline use
The app can display your 2FA codes without an internet connection.Read 4 Oct 2026 · proton.me
Open source
Proton Authenticator is open source, and Proton says anyone can inspect its code.Read 4 Oct 2026 · proton.me
Supported platforms
iOS,Android,macOS,Windows,LinuxRead 21 Sep 2026 · proton.me

Plans and prices

Free Free No ads · No tracking · Available on all platforms Read 21 Sep 2026 · proton.me
Proton Authenticator Free Completely free on all platforms · no ads · no tracking Read 4 Oct 2026 · proton.me

Every Proton Authenticator plan and price →

Strong points and limits

Strong points

  • Works without an internet connection.
  • A Proton Account is optional.
  • Imports from six listed authenticator apps.
  • Supports local and cloud backups.
  • Free on all listed platforms, with no ads or tracking.

Limits

  • Syncing across devices requires signing in.
  • Available platforms are limited to Android, iOS, Linux, macOS, and Windows.

Who it suits

It suits people who want an offline-capable authenticator with optional encrypted syncing across devices. It is also a fit for users moving codes from one of the listed authenticator apps.

Verdict

Proton Authenticator covers offline code display, import and export, and optional encrypted sync without requiring an account for basic use. Its listed apps cover desktop and mobile platforms, including Android through F-Droid.

Where Specifiction places it

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