Proton Authenticator review
A mature free option for secure 2FA codes across mobile and desktop platforms.
Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
Proton Authenticator is a free, open-source app for individuals who need to generate and manage two-factor authentication codes. It creates six-digit time-based one-time passwords and supports QR-code scanning or manual secret-key entry. The app works on iOS, Android, macOS, Windows, and Linux, making it a practical fit for people who move between phones and computers or want a desktop authenticator alongside a mobile app. Proton states that the app is completely free on all platforms, with no ads and no tracking in the Free plan.
Its strongest differentiator is the combination of portability and account protection features. Users can import tokens from other authenticator apps, synchronize codes across devices with end-to-end encryption, and create encrypted backups. Biometric or PIN protection adds a local access control option, while offline access keeps six-digit codes available without an active connection. Search and custom icons help organize accounts, and export provides a way to move authenticator codes elsewhere. People who want a free app with broad platform coverage and encrypted synchronization should find this feature set well aligned with everyday 2FA management.
The main trade-off is its focused scope. Proton Authenticator centers on TOTP codes, rather than presenting a broader set of authentication methods or organizational administration features. It can be used without a Proton Account, but syncing across devices requires signing in, so users seeking a fully account-free multi-device workflow may prefer a different approach. Individuals who want open-source software, offline codes, token imports, and encrypted backups should consider Proton Authenticator. Those needing team-oriented controls or authentication beyond time-based one-time passwords should look elsewhere.
Proton Authenticator pros and cons
- Where it wins
- Free on iOS, Android, macOS, Windows, and Linux
- End-to-end encrypted synchronization and encrypted backups
- Imports tokens and supports offline six-digit TOTP codes
- Where it doesn't
- Focused on time-based one-time passwords rather than broader authentication methods
- Cross-device synchronization requires signing in to a Proton Account
- Designed for individuals rather than broader organizational administration
Proton Authenticator fact sheet, pricing and score →
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