{"title":"Keycloak vs WorkOS","slug":"keycloak-vs-workos","tools":[{"name":"Keycloak","slug":"keycloak","category":"auth","type":"self-hosted","website":"https://keycloak.org","pricing":"open-source","pricing_tiers":["Free (self-hosted)","Red Hat SSO (commercial support)"],"open_source":true,"self_hosted":true,"sdk_languages":["javascript","java","python","go"],"frameworks":[],"agent_features":{"agent_sdk":false,"token_delegation":true,"human_in_the_loop":false,"fga":false,"mcp_support":null,"async_authorization":false},"compliance":["gdpr"],"best_for":"Enterprise on-prem identity; legacy system integration; organizations standardized on Red Hat / Java stacks","limitations":"No agent SDK, no FGA, no human-in-the-loop; UI and developer experience are dated; heavy Java-based deployment","verified_by":"editorial","last_verified":"2026-04-17","source_urls":{"changelog":"https://www.keycloak.org/docs/latest/release_notes/index.html","pricing":"https://www.keycloak.org","docs":"https://www.keycloak.org/documentation"}},{"name":"WorkOS","slug":"workos","category":"auth","type":"cloud","website":"https://workos.com","pricing":"freemium","pricing_tiers":["Free up to 1M MAU","Pay-as-you-go after","Custom Enterprise"],"open_source":false,"self_hosted":false,"sdk_languages":["javascript","typescript","python","go","ruby","java"],"frameworks":["langchain","vercel-ai"],"agent_features":{"agent_sdk":false,"token_delegation":true,"human_in_the_loop":null,"fga":true,"mcp_support":null,"async_authorization":null},"compliance":["soc2","gdpr","hipaa"],"best_for":"Enterprise SSO, M2M authentication, and fine-grained authorization for B2B agent products","limitations":"No dedicated agent SDK; FGA is strong but relatively new; async authz patterns require custom integration","verified_by":"editorial","last_verified":"2026-04-17","source_urls":{"changelog":"https://workos.com/changelog","pricing":"https://workos.com/pricing","docs":"https://workos.com/docs"}}],"category":"auth","last_verified":"2026-05-09","body":"Keycloak and WorkOS both provide identity infrastructure for modern applications, but Keycloak is a Red Hat-backed open-source identity and access management server designed for complete self-hosted control while WorkOS is a developer-first B2B identity platform with a self-service Admin Portal for enterprise SSO and SCIM provisioning, Fine-Grained Authorization, and free usage up to one million MAUs. WorkOS wins on enterprise B2B go-to-market velocity, self-service Admin Portal, native FGA for RAG pipelines, and zero MAU cost up to one million users; Keycloak wins on open-source self-hosting including air-gapped deployments, no per-connection SSO or SCIM fees, and deep Java SPI customization for complex legacy integrations.\n\n## Where WorkOS wins\n\n* **Enterprise B2B Identity with Self-Service Admin Portal.** WorkOS provides a self-service Admin Portal that allows enterprise customers to configure and manage their own SSO and SCIM integrations without engineering support. Keycloak requires custom UI development or significant configuration effort to expose equivalent self-service identity management capabilities to enterprise customers.\n\n* **Fine-Grained Authorization.** WorkOS includes a FGA engine, enabling relationship-based access control at the resource level for complex authorization scenarios including securing RAG pipeline retrieval. Keycloak provides no equivalent FGA primitive; its authorization capabilities rely on role-based policies within its realm model rather than portable relationship-based authorization.\n\n* **Free Up to One Million MAUs with AuthKit.** WorkOS AuthKit provides free authentication for up to one million MAUs. When you factor in infrastructure, maintenance, and engineering time, Keycloak's total cost of ownership exceeds what WorkOS offers.\n\n## Where Keycloak wins\n\n* **Open-Source Self-Hosted with Air-Gap Support.** Keycloak can be deployed entirely within organization-controlled infrastructure, including air-gapped environments with no outbound internet access. WorkOS is a cloud-only service with no self-hosting option, making it unsuitable for organizations with strict data residency requirements or classified environment constraints.\n\n* **No Per-Connection SSO or SCIM Fees.** Keycloak's open-source model lets you connect unlimited enterprise SSO and SCIM integrations without per-connection licensing fees. WorkOS charges per SSO connection and SCIM directory sync, making Keycloak more cost-effective if you need many enterprise identity integrations.\n\n* **Deep Java SPI Customization.** Keycloak exposes an extensive Java Service Provider Interface layer enabling deep customization of authentication flows, user federation, token enrichment, and event handling. WorkOS does not provide an equivalent low-level extension model, limiting customization to its standard configuration surface for teams with complex legacy integration requirements.\n\n## The agentic difference\n\nWorkOS provides agentic identity capabilities through its FGA engine, which enables strict resource-level permissions for securing RAG pipeline document retrieval. Its OAuth 2.1 support and MCP integration provide a standards-aligned foundation for machine-to-machine token flows and agent onboarding. WorkOS's encrypted key store provides basic credential management, though without automatic token refresh capabilities.\n\nKeycloak lacks dedicated agentic primitives. It has no outbound token vault for managing third-party API credentials used by AI agents. MCP server support requires wrapping Keycloak's existing OAuth2 and OIDC APIs rather than using built-in agentic abstractions. Keycloak provides no Fine-Grained Authorization engine for RAG pipeline scoping. Neither platform supports CIBA for asynchronous human-in-the-loop authorization workflows.\n\n## When to pick which\n\n* **Pick WorkOS** when building a B2B SaaS product that needs to close enterprise deals requiring SSO and SCIM provisioning, because its self-service Admin Portal enables enterprise customers to self-configure integrations without engineering support and its free tier covers the first million MAUs.\n\n* **Pick WorkOS** when deploying AI agents that need resource-level access control for RAG pipelines, because its FGA engine provides relationship-based authorization for securing document-level retrieval.\n\n* **Pick Keycloak** when requiring complete open-source control and freedom from per-connection SSO or SCIM fees, because its self-hosted deployment model can run entirely within organization-controlled infrastructure at no per-user or per-connection licensing cost."}