FusionAuth vs Keycloak
Side-by-side — pricing, strengths, tradeoffs, and fit.
FusionAuth
Auth that works the way you want
Keycloak
Open source identity and access management
At a glance
Free Tier
· Not enough data·From Freemium
Open SourceFree Tier
● Established·From Free / Open Source
Overview
One-liner
One-liner
Auth that works the way you want
One-liner
Open source identity and access management
Maturity
Maturity
Not enough dataMaturity
EstablishedOpen source
Open source
✕ NoOpen source
✓ YesPricing
Free tier
Free tier
✓ AvailableFree tier
✓ AvailableStarts at
Starts at
Freemium
Starts at
Free / Open Source
Model
Model
Hybrid
Model
Flat rate
Enterprise
Enterprise
✕ NoneEnterprise
✕ NoneBest for
✓ Best for
Teams needing self-hosted, enterprise-grade CIAM with unlimited users and full control over data
✓ Best for
Teams requiring fully self-hosted auth with SAML, OIDC, and user federation — especially in regulated industries
Not ideal for
✕ Not for
Teams wanting a fully managed SaaS with minimal infrastructure overhead
✕ Not for
Teams wanting managed auth with zero infrastructure overhead
Strengths
↑ Strengths
Unlimited users
Self-hosted
SSO
MFA
↑ Strengths
SSO
SAML 2.0
OpenID Connect
User federation
Weaknesses
↓ Weaknesses
—
↓ Weaknesses
—