Keycloak vs Auth0
Side-by-side — pricing, strengths, tradeoffs, and fit.
Keycloak
Open source identity and access management
Auth0
Enterprise-grade authentication and authorization platform with extensive identity-provider support.
At a glance
Open SourceFree Tier
● Established·From Free / Open Source
Free TierEnterprise
● Established·From $35/mo
Overview
One-liner
One-liner
Open source identity and access management
One-liner
Enterprise-grade authentication and authorization platform with extensive identity-provider support.
Maturity
Maturity
EstablishedMaturity
EstablishedOpen source
Open source
✓ YesOpen source
✕ NoPricing
Free tier
Free tier
✓ AvailableFree tier
✓ Available25,000 monthly active users on the free plan
Starts at
Starts at
Free / Open Source
Starts at
$35/mo
Model
Model
Flat rate
Model
Per MAU
Enterprise
Enterprise
✕ NoneEnterprise
✓ AvailableBest for
✓ Best for
Teams requiring fully self-hosted auth with SAML, OIDC, and user federation — especially in regulated industries
✓ Best for
Enterprise B2B apps needing SSO/SAMLMature enterprise connections and compliance
Teams needing fine-grained authorizationRBAC and Actions cover complex authz
Not ideal for
✕ Not for
Teams wanting managed auth with zero infrastructure overhead
✕ Not for
—
Strengths
↑ Strengths
SSO
SAML 2.0
OpenID Connect
User federation
↑ Strengths
Deep enterprise identity features
Huge ecosystem of connections/rules
Battle-tested at scale
Weaknesses
↓ Weaknesses
—
↓ Weaknesses
Essential enterprise features like Enterprise Connections and SCIM are not available on the Essentials or Professional plans.
The free tier requires credit card verification to enable custom domains.