Auth0 vs Keycloak
Auth0 and Keycloak are both security & identity tools. Auth0 is aimed at developers and enterprise, while Keycloak is aimed at enterprise and developers. Both have a free plan.
| Pricing | Freemium · $35 | Open source |
| Starting price | $35/mo | Not published |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Built for | Developers, Enterprise | Enterprise, Developers |
| Platforms | web | web |
| Country | US · 2013 | US · 2014 |
| Rating | — | — |
Choose Auth0 if
Companies with enterprise SSO requirements or large consumer user bases.
- Generous free tier (25k MAU)
- Enterprise SSO and compliance depth
- Reliable at huge scale
Look elsewhere if: Early-stage React apps wanting prebuilt UI (Clerk) or teams wanting self-hosted ownership (Better Auth, Keycloak).
Choose Keycloak if
Organizations needing self-hosted enterprise IAM.
- Free and open source
- Enterprise-grade features
- Full control over identity data
Look elsewhere if: Startups wanting simple hosted auth (Clerk, Auth0).
Auth0 vs Keycloak pricing
Auth0
- Free$0Up to 25,000 MAU, 1 custom domain, community support
- Essentials$35/moB2C, 500 MAU base; B2B from $150/mo; yearly = 11x monthly
- Professional$240/moB2C, 500 MAU base; B2B from $800/mo; 12 tenants
- EnterpriseCustom99.99% SLA, 30-day log retention
Keycloak
- Open source$0Apache 2.0, self-hosted
- Red Hat buildCustomCommercial support subscription
Auth0 · Key features
- Universal Login with social, enterprise and passwordless
- MFA, passkeys and adaptive attack protection
- Organizations for B2B multi-tenant SSO
- Fine-grained authorization and RBAC
- Actions for custom flows and integrations
- SDKs for web, mobile and backend
Cons
- Expensive once beyond free or with enterprise connections
- Complex configuration
- UI customization takes effort
Keycloak · Key features
- SSO via OIDC and SAML
- User federation with LDAP/AD
- Identity brokering and social login
- MFA and password policies
- Fine-grained authorization
- Admin and account consoles
Cons
- Operationally complex
- UI and theming are dated
- Upgrades require care
Auth0 vs Keycloak: FAQ
Do Auth0 and Keycloak have a free plan?
Yes, both Auth0 and Keycloak have a free plan; paid plans add more usage and features.