authentik vs Auth0 (2026)

Bottom line: choose Auth0 for the fastest path to production-grade authentication with zero infrastructure to manage; choose authentik if you want a self-hosted identity provider with a modern admin UI and no MAU-based billing.

Auth0 ships SDKs for essentially every language and framework and handles compliance edge cases — MFA, adaptive auth, brute-force protection — out of the box, backed by extensive documentation. Its monthly-active-user pricing escalates sharply past the free tier, a trend that accelerated after the Okta acquisition, and there's no self-hosting option: your user directory lives entirely on Auth0's infrastructure.

authentik is MIT-licensed for its community edition, self-hostable with no MAU or seat limits, and supports SSO, OIDC, SAML, and LDAP like its older rival Keycloak — but with a noticeably friendlier admin UI and a visual flow designer for custom authentication logic instead of Keycloak's XML-heavy realm configuration. Enterprise features like audit logs and support SLAs require a paid license, and its Python/Django stack carries a higher memory footprint than Go-based alternatives, but the core identity-provider functionality is fully free to self-host.

For teams that want managed auth with zero ops burden, Auth0 remains the fastest option. For teams that want to self-host and skip MAU billing entirely, authentik is the more modern open-source alternative to evaluate first.