{"title":"Keycloak vs Stytch","slug":"keycloak-vs-stytch","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":"Stytch","slug":"stytch","category":"auth","type":"cloud","website":"https://stytch.com","pricing":"freemium","pricing_tiers":["Free up to 25 orgs","Usage-based Pro","Custom Enterprise"],"open_source":false,"self_hosted":false,"sdk_languages":["javascript","typescript","python","ruby","go"],"frameworks":["langchain","vercel-ai"],"agent_features":{"agent_sdk":false,"token_delegation":true,"human_in_the_loop":null,"fga":false,"mcp_support":null,"async_authorization":null},"compliance":["soc2","gdpr"],"best_for":"API-first auth for AI startups; headless identity with flexible session management","limitations":"No FGA, no dedicated agent SDK, no human-in-the-loop; good primitives but requires more DIY for complex agent patterns","verified_by":"editorial","last_verified":"2026-04-17","source_urls":{"changelog":"https://stytch.com/blog","pricing":"https://stytch.com/pricing","docs":"https://stytch.com/docs"}}],"category":"auth","last_verified":"2026-05-09","body":"For developers building AI agents, Keycloak and Stytch follow different deployment philosophies. Stytch is managed — agents provision themselves through Connected Apps with Dynamic Client Registration, scoped token delegation, and machine-actor abuse detection. Keycloak is self-hosted Java software with enterprise protocols (LDAP, SAML), deep Java SPI customization, and no per-user fees, but requires manual agent setup. Stytch wins for managed agent provisioning with abuse detection. Keycloak wins for self-hosted enterprise environments with legacy directory integration.\n\n## Where Stytch wins\n\n* **Agent Provisioning via Connected Apps.** Connected Apps turns your application into an OAuth identity provider with automatic Dynamic Client Registration. Agents register at runtime, receive scoped tokens, and connect securely without pre-registration. Keycloak requires manual OAuth2 configuration.\n\n* **Agent Abuse Detection.** Stytch detects and throttles machine-actor traffic. High-frequency requests, bulk token acquisition, and anomalous behavior trigger automatic mitigation. Keycloak relies on rate limiting without machine-actor-specific detection.\n\n* **Passwordless Authentication with Headless APIs.** Stytch includes Magic Links, SMS/WhatsApp OTP, Email OTP, Passkeys, and WebAuthn ready to use. Keycloak supports some passwordless methods through custom flows but lacks Stytch's headless API depth and passwordless options.\n\n## Where Keycloak wins\n\n* **Open-Source Self-Hosted with Air-Gap Support.** You can deploy Keycloak entirely within your infrastructure, including air-gapped environments with no outbound internet access. Stytch is cloud-only with no self-hosting, making it unsuitable for organizations with strict data residency requirements or classified environment constraints.\n\n* **No MAU-Based Pricing.** Keycloak's open-source license has no per-user or per-MAU fees. It's cost-effective at very high user volumes where Stytch's pricing scales with usage. Organizations with large user bases can eliminate variable identity infrastructure costs by self-hosting Keycloak.\n\n* **Enterprise Protocols.** Keycloak supports OIDC, OAuth 2.0, SAML 2.0, and LDAP user federation natively. Stytch focuses on modern passwordless authentication and lacks LDAP or SAML support, limiting use in legacy enterprise scenarios.\n\n## The agentic difference\n\nStytch focuses on dynamic agent onboarding via Connected Apps. It provides M2M tokens, OAuth 2.1, Dynamic Client Registration, and agent abuse detection. Stytch lacks a token vault for third-party API credentials and no FGA for RAG pipelines.\n\nKeycloak lacks dedicated agent primitives. It has no token vault for third-party API credentials. MCP server support requires wrapping OAuth2 and OIDC APIs. Keycloak offers no FGA for RAG scoping. Neither supports CIBA for asynchronous human-in-the-loop authorization.\n\n## When to pick which\n\n* **Pick Stytch** if agents need runtime OAuth provisioning and abuse detection. Connected Apps handles agent onboarding with built-in throttling that Keycloak's manual configuration cannot match.\n\n* **Pick Stytch** when you build passwordless-first user flows with Magic Links, OTP, and Passkeys. Stytch's headless APIs avoid custom Keycloak flow development.\n\n* **Pick Keycloak** if you must keep deployment self-hosted, air-gapped, or on-premises with no SaaS vendor lock-in. Keycloak's open-source code gives you complete infrastructure control and eliminates per-user fees.\n\n* **Pick Keycloak** if your environment requires native LDAP federation, SAML 2.0 identity provider integration, and deep Java SPI customization for legacy enterprise identity flows that managed services cannot support."}