Open Authenticator review
A flexible authenticator for users who want local storage and self-hosted sync.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Open Authenticator is an open-source app for generating and managing time-based one-time passwords used in two-factor authentication. It is designed for individuals who want local control over their authenticator data, with optional synchronization across Android, iOS, macOS, Windows, and Linux. QR-code scanning and otpauth:// link handling support common account-enrollment workflows, while local authentication is available on compatible devices.
The free plan supports local use without limitations and includes synchronization for up to six TOTPs. The Contributor Subscription adds synchronization for unlimited TOTPs and is available with monthly or annual billing. The main distinction is whether a user needs synchronized access beyond six accounts: someone managing a smaller set of codes can stay with local use or the free synchronization allowance, while users with larger collections need the paid tier. Local use remains the clearest fit for those who prefer to keep synchronization optional.
Open Authenticator’s standout feature is control over where synchronized data goes. Its synchronization backend can be self-hosted, and TOTP data is encrypted both locally and when synchronized. Password-protected backup and recovery workflows add another way to preserve account access, while the GPL v3 codebase suits users who prioritize open-source software. The trade-off is a narrow focus on TOTP management rather than a broader authentication toolkit. Choose it if cross-platform access, self-hosting, and local data handling matter; consider another authenticator if you need authentication features beyond TOTP.
Open Authenticator pros and cons
- Where it wins
- Free local use without limitations
- Self-hostable synchronization across five platforms
- Encrypted data, backups, and local authentication
- Where it doesn't
- Free synchronization is limited to six TOTPs
- Unlimited synchronization requires a Contributor Subscription
- Focused on TOTP rather than broader authentication methods
Open Authenticator fact sheet, pricing and score →
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