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Auth

Free Auth0 alternatives

Auth0 (Authentication and authorization platform) is a commercial product. These 4 tools do the same job and are free to use or to self-host.
Short answer: the best free alternatives to Auth0 are Keycloak, SuperTokens, Zitadel and Better Auth. Auth0 starts at $35/mo (Essentials). Self-hosting is free; you pay only for the server (a small VPS is about $4–6/mo). Licenses and prices checked 2026-10-01.
  1. 1
    Keycloak

    Open-source identity and access management

    Identity and access management server (CNCF).

    Open source (Apache-2.0) ·details

  2. 2
    SuperTokens

    Open-source authentication for web and mobile apps

    Self-hosted auth with prebuilt UI.

    Open source (Apache-2.0 (core)) ·details

  3. 3
    Zitadel

    Open-source identity infrastructure with SSO and multi-tenancy

    Identity platform with multi-tenancy.

    Open source (AGPL-3.0) ·details

  4. 4
    Better Auth

    Open-source authentication framework for TypeScript

    TypeScript auth library that runs in your app.

    Open source (MIT) ·details

Want paid options too? See all Auth0 alternatives or the full free alternatives list.

FAQ

Is there a free alternative to Auth0?+

Yes. Keycloak, SuperTokens, Zitadel and Better Auth do the same job for free; Keycloak, SuperTokens, Zitadel and Better Auth are open source.

What is the best open-source alternative to Auth0?+

Keycloak, SuperTokens, Zitadel and Better Auth are open source. Keycloak: Identity and access management server (CNCF).

Open source: OSI-approved license. Free to self-host: the code is public and free to run yourself, with limits in the license.