The best Authentication & Identity

The mature, CNCF-backed open-source identity and access management server.

Free / self-host (Docker image or standalone distribution); commercial support available via Red Hat build of Keycloak (RHBK) for enterprises that want a support contract. · in our Auth0 comparison →

A modern, self-hostable identity provider with a flexible visual flow builder.

Free / self-host for the core MIT-licensed product; a hosted 'authentik Security' cloud offering and an Enterprise tier (support SLA, extra features under the separate enterprise/ license) are available paid. · in our Auth0 comparison →

A headless, API-only identity server for teams that want to build their own login UI.

Free / self-host under Apache-2.0; Ory Network offers a managed hosted version with a free tier and paid usage-based plans for teams that prefer not to operate it themselves. · in our Auth0 comparison →

A cloud-native, API-first identity platform with a generous self-hosted core.

Free / self-host under AGPL-3.0; ZITADEL Cloud offers a managed free tier plus paid usage-based plans for teams that don't want to run the server themselves. · in our Auth0 comparison →

A developer-friendly, self-hostable auth core built for fast integration into existing apps.

Free / self-host for the Apache-2.0 core; a managed SuperTokens cloud and a paid Enterprise tier (SSO/SAML, advanced MFA policies under the ee/ license) are available for teams that want those features or don't want to self-host. · in our Auth0 comparison →