FusionAuth vs Keycloak
- Authentication
- 4.5
- 4.5
- SSO & Federation
- 3.0
- 4.5
- Authorization
- 3.0
- 4.0
- Lifecycle & Provisioning
- 3.0
- 3.5
- MFA & Passwordless
- 3.5
- 4.0
- Governance & Audit
- 3.0
- 3.5
- Developer Experience
- 4.5
- 3.5
- Deployment Flexibility
- 4.5
- 5.0
- Pricing Transparency
- 3.5
- 5.0
- Support & Ecosystem
- 3.0
- 3.5
Scored 0–5 against a published rubric. Bold marks the higher score. Independent analysis, no vendor sponsorship.
The honest comparison
FusionAuth and Keycloak are the two names that dominate the self-hosted identity conversation, but they sit on opposite sides of the open-source line. Keycloak is a fully open-source IAM project (CNCF-adjacent, backed by Red Hat) with no license cost and deep configurability. FusionAuth is a commercial product with a free community edition, flat per-instance pricing, and a more curated developer and operations experience, plus a managed cloud if you would rather not self-host.
When FusionAuth wins
- You want self-hosting without the operational sharp edges of running Keycloak
- Flat, predictable licensing and a managed cloud fallback matter
- First-class multi-tenancy for B2B SaaS is a core requirement
- You value polished APIs, docs, and a faster path from zero to working login
When Keycloak wins
- Zero license cost is a hard requirement and you have the ops capability to run it
- You want a fully open-source platform you can fork, audit, and extend
- Deep protocol configurability and a large community and plugin ecosystem matter
- You are standardizing on Red Hat or a CNCF-aligned stack
Pricing
Keycloak is free and open source; your cost is the infrastructure and the engineering time to operate it. FusionAuth has a free community edition and flat per-instance paid editions, so cost is predictable and does not scale with active users.
Verdict
Choose Keycloak when zero license cost and full open-source control outweigh operational effort. Choose FusionAuth when you want self-hosted ownership with a more polished product, flat pricing, strong multi-tenancy, and a managed option. Both beat per-MAU SaaS economics at scale. Compare against the managed developer-first route in Okta vs Auth0, and see SuperTokens vs FusionAuth for another self-hostable angle.
Last updated 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Compiled from public research and community input and verified on a best-effort basis, so details may be incomplete or out of date.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 [email protected].