Keycloak vs FusionAuth: Which is Better in 2026?
Choosing between Keycloak and FusionAuth comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Keycloak is our overall pick for identity & access workflows. Pick FusionAuth if you need a free tier to start with.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Keycloak
Open-source identity and access management
Best for you if:
- • You need something completely free
- • Keycloak is an open-source identity and access management solution
- • It provides SSO, social login, and user federation for applications and services
FusionAuth
Customer identity and access management
Best for you if:
- • FusionAuth is a complete identity platform for authentication and authorization
- • It provides login, registration, SSO, and user management with self-hosting options
| At a Glance |  FusionAuth | |
|---|---|---|
Starts at | FreeFree tier available | FreeFree tier available |
Best For | Identity & Access | Identity & Access |
Rating | 4.3/5 | 4.6/5 |
Choose Keycloak or FusionAuth?
Choose Keycloak if
Open-source identity and access management
- Open source identity
- Self-hostable
- Feature rich
- You want a fully free tool (FusionAuth requires payment)
Choose FusionAuth if
Customer identity and access management
- Self-hosted auth
- Good features
- SSO support
| Feature | Keycloak | FusionAuth |
|---|---|---|
| Pricing Model | Free | Freemium |
| User Rating | ★4.3/5 101 reviews | ★4.6/5 179 reviews |
| Categories | Identity & AccessSecurity | Identity & AccessSecurity |
In-Depth Analysis
Keycloak
Open-source identity and access management
Strengths
- +Open source identity
- +Self-hostable
- +Feature rich
- +No per-user cost
- +Enterprise ready
Weaknesses
- -Complex to set up
- -Requires maintenance
- -Learning curve
- -Java-based
- -UI dated
Key features
FusionAuth
Customer identity and access management
Strengths
- +Self-hosted auth
- +Good features
- +SSO support
- +Fair pricing
- +Good documentation
Weaknesses
- -Self-hosting complexity
- -Learning curve
- -Enterprise expensive
- -Smaller than Auth0
- -Community smaller
Key features
Pricing: Keycloak vs FusionAuth
| Plan | Keycloak | FusionAuth |
|---|---|---|
| Tier 1 | Free Open Source | $0 Community |
| Tier 2 | N/A | $125 Starter |
| Tier 3 | N/A | $850 Essentials |
| Tier 4 | N/A | $3300 Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Keycloak pricing and FusionAuth pricing.
Who Should Use What?
On a budget?
Keycloak is free. FusionAuth is freemium.
Go with: Keycloak
Want the highest-rated option?
Keycloak: 4.3/5 (101 reviews). FusionAuth: 4.6/5 (179 reviews).
Go with: FusionAuth
Value user reviews?
Keycloak: 101 reviews (4.3/5). FusionAuth: 179 reviews (4.6/5).
Go with: FusionAuth
3 Questions to Help You Decide
What's your budget?
Keycloak is free. FusionAuth is freemium. Go with Keycloak if free matters most.
What's your use case?
Both are identity & access tools. Compare their specific features to decide.
How important are ratings?
FusionAuth is rated higher: 4.6/5 vs 4.3/5.
Key Takeaways
Keycloak
- Completely free
- Our pick for this comparison
FusionAuth
- Higher user rating: 4.6/5 vs 4.3/5
- Larger review base (179 reviews)
The Bottom Line
Keycloak is our pick.
Frequently Asked Questions
Is Keycloak or FusionAuth better?
Keycloak is rated in our evaluation. Keycloak is free and FusionAuth is freemium.
What are Keycloak and FusionAuth used for?
Keycloak: Open-source identity and access management. FusionAuth: Customer identity and access management.
What does Keycloak cost vs FusionAuth?
Keycloak is completely free. FusionAuth is freemium (free tier + paid plans). Visit their websites for detailed pricing.