Apereo CAS
Apereo CAS: A broad, auditable SSO foundation for teams prepared to run identity infrastructure. Ranked #4 of 33 in OAuth Server Software by our editors (9.0/10); pricing: Free plan; best for auditable open-source SSO infrastructure.
At a glance
- Editor score9.0 / 10
- PricingFree plan
- Best forAuditable open-source SSO infrastructure
- Free planYes
- Paid fromFree
- OpenID ConnectYes
- Facts checked22 Sep 2026
Where it wins
- Supports CAS, SAML, OAuth 2.0, OpenID Connect, REST, and WS-Federation
- Connects authentication to LDAP, databases, X.509, RADIUS, MongoDB, and more
- Includes token introspection, machine-to-machine auth, auditing, and monitoring
Where it doesn't
- Self-hosted deployment requires internal infrastructure ownership
- Its broad configuration surface may require specialist identity expertise
- Best suited to organizations able to manage a Java-based identity server
Our verdict on Apereo CAS
Apereo CAS is an open-source Java server for authentication, authorization, identity management, and single sign-on. It is designed for organizations that need a self-managed identity provider, including enterprise and higher-education environments. The platform supports web, Linux, and API use cases, while covering both user-facing SSO and service-to-service authentication. Its protocol range includes CAS, SAML, OAuth 2.0, OpenID Connect, REST, and WS-Federation, giving teams a broad foundation for connecting applications and services.
The main strength is breadth across authentication sources and identity workflows. Administrators can configure LDAP, databases, X.509, RADIUS, MongoDB, SPNEGO, and JAAS, while multifactor integrations include Duo Security, FIDO2 WebAuthn, and Google Authenticator. Delegated authentication supports external identity providers, and OIDC capabilities include discovery, client registration, claims mapping, and token policies. SCIM, reCAPTCHA, and Swagger are also part of its integration landscape. This makes CAS a strong fit when an organization needs to bring varied systems under one identity layer rather than adopt a narrow SSO service.
Operational visibility is another important advantage. Centralized auditing, logging, monitoring, statistics, and metrics support governance and ongoing administration, while OAuth token introspection and the client-credentials grant cover machine-to-machine scenarios. Deployment options include Docker, a WAR overlay, and Kubernetes, but CAS remains a self-hosted platform: teams should choose it when they can own infrastructure, configuration, and identity operations. Organizations seeking a tightly managed service with minimal platform administration should consider a different approach. For teams prioritizing open-source control, protocol coverage, and auditable identity infrastructure, Apereo CAS is a capable choice.
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Apereo CAS pricing
Apereo CAS fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| OpenID Connect | Yes |
| SAML support | Yes |
| Self-hosting | Yes |
| Token introspection | Yes |
| Machine-to-machine auth | Yes |
| Deployment model | Self_hosted |
| Deployment | Self-hosted |
| Platforms | Web, Linux |
| Support | Docs |
| Built for | Mid-market, Enterprise (editorial estimate) |
| Integrations | 13 integrations: LDAP, databases, X.509, SPNEGO, JAAS, RADIUS … |
| Pricing | Free plan |
| Website | apereo.github.io |
| Facts checked | 22 Sep 2026 |
Apereo CAS integrations
Apereo CAS lists 13 integrations on its own site.
- LDAP
- databases
- X.509
- SPNEGO
- JAAS
- RADIUS
- MongoDB
- Duo Security
- FIDO2 WebAuthn
- Google Authenticator
- SCIM
- reCAPTCHA
- Swagger
Alternatives to Apereo CAS
- KeycloakA broad, self-hosted IAM server for standards-based authentication and authorization.9.4
- authentikA broad, self-hosted identity stack for teams that need open-source control.9.2
- WSO2 Identity ServerA broad self-hosted IAM platform for enterprise OAuth, OIDC, SAML, and provisioning needs.9.1
See all Apereo CAS alternatives →
Apereo CAS vs the competition
- Apereo CAS vs Keycloak
- Apereo CAS vs authentik
- Apereo CAS vs WSO2 Identity Server
- Apereo CAS vs OpenIddict
- Apereo CAS vs Ory
- Apereo CAS vs Amazon Cognito
Compare Apereo CAS with any tool side by side →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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