GitPop
4 candidates

Open source alternatives to Auth0

Identity platform for authentication, authorization, and user management. · Okta, Inc.

Pricing: Free up to 7,500 MAU; paid plans from $35/mo

Auth0 (now part of Okta) is the default 'auth-as-a-service' for teams that don't want to build login flows. Open-source alternatives split into two camps: identity-provider-only (Keycloak, Ory) and full-stack auth (Supabase Auth, Appwrite Auth, Logto). Keycloak is the right pick for 'enterprise SSO + SAML + LDAP'; Logto is the right pick for developers who want a developer-friendly Auth0 replacement with a modern UI.

The 4 candidates, ranked by PopScore

  1. #01logto-io/logto

    Modern auth-as-a-service that you can self-host. The most developer-friendly Auth0 replacement in 2026, with first-class OIDC and passwordless support.

    GitHub
  2. #02keycloak/keycloak

    Enterprise identity provider with SSO, SAML, LDAP, and OAuth2. The right pick for large orgs and traditional IT environments.

    GitHub
  3. #03ory/kratos

    Cloud-native identity system with a headless API. The right pick for teams that want a developer-first identity stack they can compose.

    GitHub
  4. #04zitadel/zitadel

    Cloud-native identity platform with first-class multi-tenancy. The right pick for B2B SaaS that needs orgs, projects, and roles out of the box.

    GitHub

Related alternatives

Looking for a side-by-side comparison of two open-source projects? The compare matrix has 60+ "X vs Y" pages. Looking for a curated "best of" list for a specific category? See Best AI tools 2026 (and the 7 other category editions).

Best open source alternatives to Auth0 (2026) · GitPop