Best Auth0 Alternatives (2 Free OSS)

Auth0 is widely used as a managed authentication service, but per-MAU pricing becomes expensive at scale. devpick lists OSS alternatives for building self-hosted authentication infrastructure.

• SSO via OIDC and SAML 2.0 for building single sign-on on your own infrastructure
• Social login integrating GitHub, Google, Apple, and other OAuth providers
• LDAP integration for Active Directory and LDAP user synchronization
• Auth flow customization with GUI-based flow builders in Keycloak and authentik
• No MAU limits with unlimited users when self-hosted

For proven enterprise authentication infrastructure choose Keycloak, and for modern UI with flexible flow building choose authentik.