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Authenticator

An open-source replacement for Google's authenticator app

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Authenticator is an open-source two-factor authentication app that generates one-time passwords using HMAC-based algorithms (HOTP and TOTP). It supports SHA-1, SHA-256, and SHA-512 hash functions, and originally supported MD5 before that support was removed due to a flaw where the 16-byte MD5 hash could produce inconsistent passwords. It was built as an open-source alternative to Google's authenticator app and supports the otpauth:// key URI format.

12 alternatives to Authenticator

Ranked by how well each tool replaces Authenticator: shared features, audience, price and popularity.

  1. Authenticator Plus

    Better way to manage 2-factor enabled accounts

    Covers 0 of 4 key features.

    59 out of 100 match—

  2. Authyo

    OTP authentication, passwordless login and multi-factor authentication in one platform

    Covers 0 of 4 key features and has a free plan.

    Free plan
    57 out of 100 matchUsage-based

  3. OpenID Foundation

    Trusted Identity Ecosystems

    Covers 1 of 4 key features and has a free plan.

    Free planOpen source
    53 out of 100 matchFree

  4. OpenLDAP

    Open source LDAP software and information.

    Covers 1 of 4 key features and has a free plan.

    Free planOpen source
    52 out of 100 matchFree

  5. Protectimus

    Two-Factor Authentication Provider - Protectimus Limited

    Covers 0 of 4 key features and has a free plan.

    Free plan
    50 out of 100 match$2/mo

  6. privacyIDEA

    flexible, Open Source Multi Factor Authentication (2FA)

    Covers 1 of 4 key features and has a free plan.

    Free planOpen source
    48 out of 100 matchFree

  7. Shibboleth

    Shaping the future of Shibboleth Software

    Covers 1 of 4 key features and has a free plan.

    Free planOpen source
    47 out of 100 matchContact sales

  8. Teleport

    Unified identity layer for humans, machines, and AI across infrastructure

    Covers 1 of 4 key features.

    Open source
    47 out of 100 matchUsage-based

  9. Reclaim Protocol

    Verify education and employment credentials globally with Reclaim Protocol from $0.10

    Covers 1 of 4 key features and has a free plan.

    Free planOpen source
    45 out of 100 match$2,000/mo

  10. OPAL

    Open policy administration layer.

    Covers 1 of 4 key features.

    Open source
    43 out of 100 match—

  11. Univention Nubus

    Digital sovereignty starts with identity and access management.

    Covers 1 of 4 key features.

    Open source
    40 out of 100 matchContact sales

  12. SpruceID

    Digital trust from intake to decision

    Covers 1 of 4 key features.

    39 out of 100 match—