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pi-authenticator review

Free#67 of 111 in Authenticator Apps

A free, open-source mobile MFA app with OTP codes, push approvals, and privacyIDEA integration.

3.0/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

pi-authenticator is a free, open-source mobile authenticator for Android and iOS, designed primarily for people using the privacyIDEA Authentication Server. It generates HOTP and TOTP codes, supports 30- and 60-second TOTP periods, and handles push authentication approvals. The app also scans QR codes in the Google Authenticator Key URI format, making it suitable for common token enrollment workflows. Its audience is clearest when privacyIDEA is already part of an organization’s authentication setup, though it also supports standard authenticator app use.

Its strongest technical focus is the combination of token flexibility and privacyIDEA integration. Hashing support includes SHA-1, SHA-256, and SHA-512, while token imports are available from Google Authenticator, Aegis, and 2FAS Authenticator. More secure token enrollment is available with privacyIDEA, and push authentication can be configured without Firebase. Biometric or app authentication protection adds a local access control option for stored tokens. These features make pi-authenticator a practical fit for teams that want mobile MFA tied to an open-source authentication server rather than a standalone consumer app.

The trade-off is a narrow ecosystem focus. The published product details identify privacyIDEA Authentication Server and Firebase as integrations, with no broader platform coverage described beyond Android and iOS. That focus should suit privacyIDEA users who value open-source software, push approvals, and token migration options. Organizations seeking a wider range of identity-provider integrations, desktop support, or a general-purpose authenticator with broader ecosystem coverage should consider an alternative. The free model keeps adoption straightforward, with no paid tier structure involved.

pi-authenticator pros and cons

  • Where it wins
    • Free and open source on Android and iOS
    • Supports HOTP, TOTP, push approvals, and multiple hashing options
    • Imports tokens from Google Authenticator, Aegis, and 2FAS Authenticator
  • Where it doesn't
    • Primarily intended for use with privacyIDEA
    • Integrations are limited to privacyIDEA Authentication Server and Firebase
    • No desktop platform or broader ecosystem coverage is described

pi-authenticator fact sheet, pricing and score →

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