Keycloak vs FusionAuth
Side-by-side comparison of identity tools. Sponsored placement is disclosed where applicable.
Last updated 5/30/2026
Quick answer
Keycloak vs FusionAuth: which should you choose?
Short answer
Keycloak vs FusionAuth have overlapping use cases in identity and access management. The right pick depends on your company size, deployment model, integrations, and pricing tolerance — compare those attributes side-by-side below.
- Best for
- Keycloak: Organizations that require a fully open source, self-hosted IAM platform with enterprise-grade features and no licensing cost. Strong fit for large enterprises with technical resources to operate it, government agencies with data sovereignty requirements, and universities or research institutions managing complex identity federation. · FusionAuth: Organizations that want deployment flexibility (self-hosted option), comprehensive authentication features without MAU-based pricing at scale, and a developer-friendly API. Particularly relevant for companies in regulated industries with data residency requirements, gaming companies with large user bases, or teams that prefer open source-adjacent infrastructure.
- When to choose
- Pick the option whose company-size fit, deployment model, and integrations most closely match your stack.
- When not to choose
- Skip a head-to-head if you haven't shortlisted a category yet — start with the IAM Stack Finder instead.
- Related tools & categories
- KeycloakFusionAuthIAM Stack FinderBuyer resources
| Attribute | ||
|---|---|---|
| Best for | Organizations that require a fully open source, self-hosted IAM platform with enterprise-grade features and no licensing cost. Strong fit for large enterprises with technical resources to operate it, government agencies with data sovereignty requirements, and universities or research institutions managing complex identity federation. | Organizations that want deployment flexibility (self-hosted option), comprehensive authentication features without MAU-based pricing at scale, and a developer-friendly API. Particularly relevant for companies in regulated industries with data residency requirements, gaming companies with large user bases, or teams that prefer open source-adjacent infrastructure. |
| Short description | Keycloak is the most widely deployed open source IAM platform, providing enterprise-grade SSO, MFA, SAML, OIDC, LDAP, and Kerberos support in a self-hosted, Apache 2.0 licensed package maintained by Red Hat. | FusionAuth is a comprehensive authentication and user management platform offering flexible deployment (self-hosted, private cloud, or FusionAuth Cloud), developer-friendly APIs, and broad feature coverage including SSO, MFA, SAML, OIDC, and multi-tenancy. |
| Company size | Mid-market, Enterprise, Government / Education | Startup, Mid-market, Enterprise |
| Deployment | Self-hosted | Self-hosted, Private Cloud, SaaS / Cloud-hosted (FusionAuth Cloud) |
| Source | Open source (Apache 2.0) | Source-available (Community Edition); verify current license at fusionauth.io |
| Pricing model | Free (open source); Red Hat SSO commercial support available separately | Free for self-hosted Community Edition; cloud and enterprise tiers by deployment/support |
| Integrations | Active Directory, LDAP, Google, GitHub, Facebook, Kubernetes, Istio, Envoy | Google, Apple, GitHub, Facebook, LDAP, Active Directory, Salesforce, Twilio |
| Categories | SSO, Customer Identity / CIAM, Developer Authentication, MFA / Passwordless | SSO, Customer Identity / CIAM, Developer Authentication, MFA / Passwordless |
| Claimed profile |