Clerk vs Keycloak
The ultimate side-by-side head-to-head analysis for 2026.
Short answer
- Price: not directly comparable — Clerk is free tier available, Keycloak is free.
- How to start: Clerk is free tier available, Keycloak is free.
These lines are generated from the pricing we track, not from a paid placement. We do not publish a quality score, because we do not have one we can stand behind. They cannot tell you which tool fits your workflow — the sections below are there for that. How we score tools.
Clerk
Keycloak
Category
Developer Tools
Developer Tools
Base Price
Free tier
Free
Public API
Yes
Yes
Mobile app
No
No
Open source / self-hostable
No
Yes
SSO (SAML)
Yes
Yes
Choose Clerk if:
Product teams who would rather ship features than build authentication.
Choose Keycloak if:
Organisations that need enterprise identity without a per-user bill.
Clerk: pros & cons
- Prebuilt UI components that look decent by default
- Handles sessions, MFA and organisations
- Strong React and Next.js support
- Pricing per monthly active user adds up
- Deep customisation fights the defaults
- Auth becomes a vendor dependency
Keycloak: pros & cons
- Full identity server at no licence cost
- Standards support including SAML and OIDC
- Complete control over user data
- Operating it is a real responsibility
- Administration console is dense
- Upgrades need care
Our verdict on Clerk
A big time-saver early on. Understand the per-user pricing curve before your user count grows.
Our verdict on Keycloak
The serious open-source answer to Auth0. Budget for the operations, because the licence saving is not free.