Keycloak
Capability scores
Methodology →- Authentication
- 4.5
- SSO & Federation
- 4.5
- Authorization
- 4.0
- Lifecycle & Provisioning
- 3.5
- MFA & Passwordless
- 4.0
- Governance & Audit
- 3.5
- Developer Experience
- 3.5
- Deployment Flexibility
- 5.0
- Pricing Transparency
- 5.0
- Support & Ecosystem
- 3.5
Scored 0–5 against a published rubric. Independent analysis, no vendor sponsorship.
Overview
Keycloak is the most widely deployed open-source identity and access management server, now a CNCF project with Red Hat as primary sponsor. It provides SSO, OIDC and SAML federation, user federation, social login, and fine-grained authorization out of the box, all self-hosted and free of license fees. See the open-source IAM category and the best IAM platforms.
What it is good at
Protocol coverage and flexibility are the strengths: OIDC, SAML, and OAuth2 are mature, MFA and increasingly passkey support are solid, and authorization services plus custom SPIs let you extend almost anything. Realms make multi-tenant setups practical. Because it is free under Apache 2.0 and battle-tested at scale, it delivers commercial-grade features at zero license cost, which is why it anchors so many self-hosted identity stacks.
Where it falls short
The trade-offs are operational. You own scaling, high availability, upgrades, and database tuning, and major version jumps (such as the move to Quarkus) have required real migration effort. Lifecycle provisioning and governance reporting are weaker than commercial IGA tools, and the admin console, while capable, has rough edges. With competent platform engineers it is excellent value; without them it can become a maintenance burden.
Pricing
Free and open source under Apache 2.0; self-host at no license cost. Commercial support is available through the Red Hat build of Keycloak and various third parties if you want SLAs. Model the operational cost, not just licensing, with the TCO calculator.
Best for, and who should look elsewhere
Choose Keycloak when you need a full-featured IdP you can self-host with no license cost and have the team to run it. For a modern, API-first alternative, compare Keycloak vs Zitadel; for composable components and ReBAC, see Ory; for managed flat-priced self-hosting, see FusionAuth.
Bottom line
The default open-source IdP for teams that can run it, offering commercial-grade features at zero license cost. Budget for the operational work it requires.
Keycloak comparisons
By SWI Community Team · Last evaluated 2026-06-19
Independent, community-driven analysis. No vendor sponsorship. Compiled from public research and community input and verified on a best-effort basis, so details may be incomplete or out of date. Scores are opinions, not advice. Trademarks belong to their owners; mention does not imply affiliation or endorsement. See the full disclaimer, or send corrections to community@startwithidentity.com.