FusionAuth vs Keycloak
Side-by-side comparison of identity tools. Sponsored placement is disclosed where applicable.
Quick answer
FusionAuth vs Keycloak: which should you choose?
Short answer
FusionAuth vs Keycloak 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
- 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. · 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.
- 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
- FusionAuthKeycloakIAM Stack FinderBuyer resources
| Attribute | ||
|---|---|---|
| Best for | 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. | 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. |
| Short description | 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. | 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. |
| Company size | Startup, Mid-market, Enterprise | Mid-market, Enterprise, Government / Education |
| Deployment | Self-hosted, Private Cloud, SaaS / Cloud-hosted (FusionAuth Cloud) | Self-hosted |
| Source | Source-available (Community Edition); verify current license at fusionauth.io | Open source (Apache 2.0) |
| Pricing model | Free for self-hosted Community Edition; cloud and enterprise tiers by deployment/support | Free (open source); Red Hat SSO commercial support available separately |
| Integrations | Google, Apple, GitHub, Facebook, LDAP, Active Directory, Salesforce, Twilio | Active Directory, LDAP, Google, GitHub, Facebook, Kubernetes, Istio, Envoy |
| Categories | SSO, Customer Identity / CIAM, Developer Authentication, MFA / Passwordless | SSO, Customer Identity / CIAM, Developer Authentication, MFA / Passwordless |
| Claimed profile |
Buyer help
Request a vendor shortlist
Tell us what you're evaluating and IDSync will identify the identity, access, and security tools that fit your use case.
Request a vendor shortlist
Tell us your stack and we'll send a tailored shortlist.
Run the IAM Stack Finder
Get a guided shortlist in under 3 minutes.
Buyer's guides & checklists
RFP templates, migration checklists, and rollout playbooks.