No. 11 of 31 ·Single Sign-On Software

Apereo CAS

Web · Self-hosted · API

Freedom report

Two barsScore 6.4

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Apereo CAS is ranked #11 of 31 in single sign-on software on Freedom251. It runs on API, Self-hosted, Web. There is a free plan.

Apereo CAS plans and pricing

All plans

Apereo CAS Free Apache License 2.0 · open source apereo.org · 1 Oct 2026

Compared on single sign-on software

Free plan: Yes
SSO protocols: CAS, SAML 2.0, OAuth 2.0, OpenID Connect
Directory integrations: LDAP, Active Directory, OpenLDAP
Built-in MFA: Yes
Adaptive access: Yes

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The record

Purpose: CAS is a multilingual single sign-on solution and open-source identity provider for web authentication and authorization.
Middleware: CAS operates as middleware between web applications and authentication sources, providing a unified authentication point.
Security features: CAS provides session management, single logout, and passwordless multifactor authentication.
Protocols: The project supports CAS, SAML v1, SAML v2, WS-Federation, OAuth2, OpenID Connect, and REST protocols.
Authentication sources: Pluggable authentication support includes LDAP, databases, X.509, SPNEGO, JAAS, JWT, RADIUS, and MongoDB.
Multifactor providers: Supported multifactor providers include Duo Security, YubiKey, RSA/RADIUS, Google Authenticator, FIDO2 WebAuthn, Twilio, Inwebo, and CAS Simple.
Delegated authentication: CAS can delegate authentication to external providers such as ADFS, Facebook, Twitter, SAML2 identity providers, and OpenID Connect providers.
Operations: CAS can monitor application and system behavior, statistics, and metrics in real time and centrally manage audits and logs.
Clients: Cross-platform client support includes Java, .NET, PHP, Perl, and Apache clients.
Integrations: CAS provides integrations with SAML2 service providers and supports SCIM, reCAPTCHA, and Swagger.
WebAuthn security: WebAuthn support uses public-key cryptography for phishing-resistant authentication and can use security keys or built-in platform authenticators.
License: Apereo CAS is distributed under the Apache License, Version 2.0.
Support: Apereo staff do not provide technical project support but direct users to project communities and mailing lists, including CAS security, developer, and user lists.
Audience: CAS originated in higher education and is also described as adaptable to Fortune 500 companies and small special-purpose installations.
Price from: Free

Where it ranks on Freedom251

Best Single Sign-On Software in 2026#11 of 31

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Sources

apereo.org/programs/software/cas· checked 1 Oct 2026
apereo.github.io/cas/index.html· checked 1 Oct 2026
apereo.github.io/cas/development/mfa/Configuring-Multifa· checked 1 Oct 2026
apereo.github.io/cas/8.0.x/mfa/FIDO2-WebAuthn-Authentica· checked 1 Oct 2026
apereo.org/contact· checked 1 Oct 2026
apereo.org/news/2026/cas-v736-release· checked 1 Oct 2026