Best Authentication & Identity (2026)
Login, SSO, and user management for apps.
Authentication platforms handle login, single sign-on, and user management so you don't have to roll your own security. The open-source identity providers here support OIDC, SAML, and social login while keeping your user directory and monthly-active-user pricing under your control.
Switching from a specific tool?
Battle-tested open-source identity and access management with SSO, OIDC, and SAML.
- Apache-2.0 licensed — completely free with no seat or MAU limits
- CNCF-incubating project with Red Hat backing and a decade of production hardening
- Java-based stack is resource-heavy and slow to cold-start compared to modern alternatives
Modern open-source identity provider with a clean UI, supporting SSO, OIDC, SAML, and LDAP.
- Significantly friendlier admin UX than Keycloak — less XML, no realm mental model
- MIT-licensed community edition is free with no MAU or seat limits
- Enterprise features (audit logs, support SLAs) require a paid license
Open-source authentication with session management, social login, and passwordless — self-host or managed.
- Apache-2.0 licensed core is free to self-host with no MAU or seat limits
- Recipe-based architecture lets you mix and match auth methods modularly
- Enterprise features like SAML SSO and SCIM provisioning require the paid managed plan
Identity-as-a-service platform for adding authentication and authorization to any application.
- Fastest path to production-grade auth — SDKs for every major language and framework
- Handles compliance edge-cases (MFA, adaptive auth, brute-force protection) out of the box
- MAU-based pricing escalates sharply past the free tier, especially after Okta acquisition
Top comparisons
FAQ
What is the best authentication & identity tool?
Keycloak is a top pick: Battle-tested open-source identity and access management with SSO, OIDC, and SAML.
Are there free or open-source authentication & identity tools?
Yes — Keycloak, authentik, SuperTokens are open source and most can be self-hosted.