--- title: "Keycloak — Open Source IAM, SSO & Identity Platform | IDSync" description: "Independent review of Keycloak. Compare open source SSO, SAML/OIDC support, LDAP integration, operational requirements, and top alternatives. See when…" lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "SoftwareApplication", "name": "Keycloak", "applicationCategory": "SecurityApplication", "applicationSubCategory": "SSO", "url": "https://www.keycloak.org", "description": "Keycloak is an open source identity and access management platform developed by Red Hat and supported commercially as Red Hat Single Sign-On (RHSSO). It is one of the most mature and feature-complete open source IAM platforms available, supporting SAML 2.0, OpenID Connect, OAuth 2.0, LDAP, Kerberos, social login, and WS-Federation via extensions. Keycloak is extensively deployed in large enterprises, government agencies, and universities worldwide. Its Service Provider Interface (SPI) architecture allows extensive customization via plugins. The trade-off for this breadth is operational complexity — Keycloak requires meaningful infrastructure expertise and careful planning for production deployments. Community support is available via forums and GitHub; commercial support is available from Red Hat.", "offers": { "@type": "Offer", "category": "Free (open source); Red Hat SSO commercial support available separately" }, "dateModified": "2026-05-31T13:32:15.631476+00:00" }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is Keycloak?", "acceptedAnswer": { "@type": "Answer", "text": "Keycloak is an open source identity and access management platform developed by Red Hat and supported commercially as Red Hat Single Sign-On (RHSSO). It is one of the most mature and feature-complete open source IAM platforms available, supporting SAML 2.0, OpenID Connect, OAuth 2.0, LDAP, Kerberos, social login, and WS-Federation via extensions. Keycloak is extensively deployed in large enterprises, government agencies, and universities worldwide. Its Service Provider Interface (SPI) architecture allows extensive customization via plugins. The trade-off for this breadth is operational complexity — Keycloak requires meaningful infrastructure expertise and careful planning for production deployments. Community support is available via forums and GitHub; commercial support is available from Red Hat." } }, { "@type": "Question", "name": "Who is Keycloak best for?", "acceptedAnswer": { "@type": "Answer", "text": "Organizations that require a fully open source, self-hosted IAM platform with enterprise-grade features and no licensing cost. Strong fit for large enterprises with technical resources to operate it, government agencies with data sovereignty requirements, and universities or research institutions managing complex identity federation." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://idsync.com/" }, { "@type": "ListItem", "position": 2, "name": "Directory", "item": "https://idsync.com/directory" }, { "@type": "ListItem", "position": 3, "name": "SSO", "item": "https://idsync.com/directory/category/sso" }, { "@type": "ListItem", "position": 4, "name": "Keycloak", "item": "https://idsync.com/directory/keycloak" } ] } ] --- [![IDSync — identity software buyer platform](/assets/idsync-logo-BKS89EW4.png)](/) [Directory](/directory) [Compare](/compare) [Resources](/resources) [Browse tools](/directory)[Run Stack Finder](/stack-finder) 1. [Home](/) 2. [Directory](/directory) 3. [SSO](/directory/category/sso) 4. Keycloak ![Keycloak company logo](https://www.google.com/s2/favicons?sz=128&domain=keycloak.org) # Keycloak Keycloak is the most widely deployed open source IAM platform, providing enterprise-grade SSO, MFA, SAML, OIDC, LDAP, and Kerberos support in a self-hosted, Apache 2.0 licensed package maintained by Red Hat. Last updated 3 months ago [Visit site](https://www.keycloak.org) Quick answer ## What is Keycloak? Short answer Keycloak is an open source identity and access management platform developed by Red Hat and supported commercially as Red Hat Single Sign-On (RHSSO). It is one of the most mature and feature-complete open source IAM platforms available, supporting SAML 2.0, OpenID Connect, OAuth 2.0, LDAP, Kerberos, social login, and WS-Federation via extensions. Keycloak is extensively deployed in large enterprises, government agencies, and universities worldwide. Its Service Provider Interface (SPI) architecture allows extensive customization via plugins. The trade-off for this breadth is operational complexity — Keycloak requires meaningful infrastructure expertise and careful planning for production deployments. Community support is available via forums and GitHub; commercial support is available from Red Hat. Best for Organizations that require a fully open source, self-hosted IAM platform with enterprise-grade features and no licensing cost. Strong fit for large enterprises with technical resources to operate it, government agencies with data sovereignty requirements, and universities or research institutions managing complex identity federation. When to choose Choose Keycloak when you need an enterprise-grade, fully open source IAM platform with no per-user licensing cost, have the engineering resources to operate it, require data sovereignty through self-hosting, and need maximum protocol support breadth. When not to choose Avoid Keycloak if you lack the engineering resources for self-hosted operations, want a modern admin UI, need a quick-to-deploy solution, or are a smaller team without Keycloak expertise on staff. Related tools & categories [SSO](/directory/category/sso)[MFA / Passwordless](/directory/category/mfa)[Customer Identity / CIAM](/directory/category/ciam)[Ory](/directory/ory)[Zitadel](/directory/zitadel)[Run the IAM Stack Finder](/stack-finder)[Report: The State of AI Agent Identity 2026](/reports/state-of-ai-agent-identity-2026) ## Categories [SSO ★](/directory/category/sso)[MFA / Passwordless](/directory/category/mfa)[Customer Identity / CIAM](/directory/category/ciam)[Developer Authentication](/directory/category/developer-auth) ## Common use cases - SSO across an application portfolio using SAML and OIDC - Identity federation between organizations using SAML or OIDC - User federation to existing LDAP or Active Directory directories - Social login integration for consumer-facing applications - Fine-grained authorization using Keycloak Authorization Services - Custom authentication flows using Keycloak's Authentication SPI ## Strengths - Apache 2.0 license — fully open source with no per-user cost - Broadest protocol support of any open source platform: SAML 2.0, OIDC, OAuth 2.0, LDAP, Kerberos, social - Highly extensible via Service Provider Interfaces (SPIs) for custom authentication, user federation, and event listeners - Large, active community with extensive documentation and third-party resources - Commercial support available from Red Hat (RHSSO) for enterprises that need it - Production-proven at scale in some of the world's most demanding environments ## Limitations & considerations - Significant operational complexity — requires Keycloak expertise to deploy, tune, and maintain in production - Major version upgrades have historically been complex (particularly pre-21 to 21+ migrations) - Admin UI is functional but dated compared to modern platforms like Zitadel or Authentik - Not suitable for organizations without dedicated infrastructure engineering resources - Multi-tenancy support requires careful realm architecture; not as native as Zitadel's approach ## Pricing model summary Keycloak Community is free and open source (Apache 2.0). Red Hat Single Sign-On (RHSSO) commercial support is available from Red Hat with per-core or subscription pricing. Verify current RHSSO pricing with Red Hat. ## Integrations Active Directory LDAP Google GitHub Facebook Kubernetes Istio Envoy ## Fit Company size Mid-market, Enterprise, Government / Education Deployment Self-hosted Source Open source (Apache 2.0) Pricing model Free (open source); Red Hat SSO commercial support available separately ## Alternatives & comparisons [Ory](/directory/ory) Open source identity, authorization and zero trust stack (Kratos, Hydra, Keto, Oathkeeper) available self-hosted or as Ory Network SaaS. [Compare Keycloak vs Ory →](/compare/keycloak-vs-ory) [Zitadel](/directory/zitadel) Open source identity and access platform with built-in multi-tenancy, SSO, MFA and a managed Zitadel Cloud SaaS. [Compare Keycloak vs Zitadel →](/compare/keycloak-vs-zitadel) [FusionAuth](/directory/fusionauth) FusionAuth is a comprehensive authentication and user management platform offering flexible deployment (self-hosted, private cloud, or FusionAuth Cloud), developer-friendly APIs, and broad feature coverage including SSO, MFA, SAML, OIDC, and multi-tenancy. [Compare Keycloak vs FusionAuth →](/compare/keycloak-vs-fusionauth) IDSync provides educational buyer guidance based on publicly available information, editorial review, and user-submitted data. Vendor information should be verified before purchase. [Who we are, our methodology & disclosure policy](/about). Keycloak and its logo are trademarks of their respective owner. IDSync is an independent buyer resource and does not imply endorsement unless explicitly stated. ### Take action [Request vendor shortlist](/request-shortlist)[Run the IAM Stack Finder](/stack-finder)[Request vendor intro](/contact)[Docs ↗](https://www.keycloak.org/documentation) ### Work at Keycloak? Claim this profile to keep it current. 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