Keycloak vs league/oauth2-server: side-by-side comparison (2026)
Keycloak is a commercial access management solution by Keycloak. league/oauth2-server is a free access management solution. Features, integrations, deployment and the company behind each one, side by side.
Open source IAM server providing SSO, identity brokering, federation, and authorization.
A PHP OAuth 2.0 authorization server implementation with support for various grants and RFCs.
Side-by-side comparison
Feature
Keycloak
league/oauth2-server
Pricing model
Commercial
Free
Category
Access Management
Access Management
Deployment and fit
Deployment type
Hybrid
On-Premises
Company size fit
Startup, SMB, Mid-Market, Enterprise
Startup, SMB, Mid-Market, Enterprise
Open source
GitHub stars
–
6,618
Last commit
–
Aug 2025
Company
Company
Keycloak
–
Use cases and capabilities
Single Sign On
Yes
No
MFA
Yes
No
Authentication
Yes
No
Authorization
Yes
No
Open Source
Yes
No
PHP
No
Yes
Core features
10 features listed
No features listed
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