{"slug":"best-self-hosted-customer-identity-platforms","title":"Best self-hosted customer identity platforms","question":"What are the best self-hosted customer identity platforms in 2026?","verdict":"As of 2026-08-04, ChatGPT, Claude and Gemini collectively rank Keycloak #1 for self-hosted customer identity platforms on ModelsAgree — unanimous among the 3 models that have answered. The models' case: The best all-round value: mature, fully open-source, highly extensible, and unusually broad across OIDC, OAuth, SAML, federation, organizations, passkeys, authorization. The models' main caveat: Production customization and multi-cluster operation demand substantial identity and platform expertise. The strongest alternative is ZITADEL — Near-tied with Keycloak and arguably better for greenfield B2B SaaS: first-class organizations and projects, strong delegated administration. Source: https://modelsagree.com/best/best-self-hosted-customer-identity-platforms (modelsagree.com, CC BY 4.0).","category":"Auth","url":"https://modelsagree.com/best/best-self-hosted-customer-identity-platforms","updated":"2026-08-04","models":["ChatGPT","Claude","Gemini"],"consensus":"All 3 models rank Keycloak the top pick","disagreement":null,"combined":[{"rank":1,"product":"Keycloak","domain":"keycloak.org","score":15,"appearances":3,"modelRanks":{"ChatGPT":1,"Claude":1,"Gemini":1},"reason":"The best all-round value: mature, fully open-source, highly extensible, and unusually broad across OIDC, OAuth, SAML, federation, organizations, passkeys, authorization, and deployment patterns. It narrowly beats ZITADEL when protocol breadth, longevity, and avoiding feature licenses matter most."},{"rank":2,"product":"ZITADEL","domain":"zitadel.com","score":11,"appearances":3,"modelRanks":{"ChatGPT":2,"Claude":2,"Gemini":3},"reason":"Near-tied with Keycloak and arguably better for greenfield B2B SaaS: first-class organizations and projects, strong delegated administration, API-first automation, passkeys, SAML/OIDC, SCIM, and comprehensive audit events in a comparatively efficient package."},{"rank":3,"product":"FusionAuth","domain":"fusionauth.io","score":10,"appearances":3,"modelRanks":{"ChatGPT":3,"Claude":3,"Gemini":2},"reason":"Purpose-built for customer identity with native multi-tenancy, flexible user data schemas, high-throughput performance, and webhooks designed for custom registration flows. Shares a near-tie with Keycloak for teams prioritizing rapid developer onboarding over pure open-source licensing."},{"rank":4,"product":"Ory","domain":"ory.sh","score":4,"appearances":3,"modelRanks":{"ChatGPT":5,"Claude":4,"Gemini":5},"reason":"API-first, headless, cloud-native building blocks that give maximum flexibility and clean separation of concerns; ideal when you want to own the UI entirely and compose exactly the flows and authz model you need at scale."},{"rank":5,"product":"Logto","domain":"logto.io","score":2,"appearances":1,"modelRanks":{"ChatGPT":4},"reason":"The most approachable modern option for product teams, with excellent hosted-login UX, clean SDKs and management APIs, organizations, organization RBAC, enterprise SSO, MFA, passkeys, and simple PostgreSQL-based deployment."},{"rank":6,"product":"SuperTokens","domain":"supertokens.com","score":2,"appearances":1,"modelRanks":{"Gemini":4},"reason":"Developer-first architecture delivering pre-built UI components and modular backend SDKs that embed directly into web and mobile codebases, giving teams complete control over user data with minimal setup overhead."},{"rank":7,"product":"Authentik","domain":"goauthentik.io","score":1,"appearances":1,"modelRanks":{"Claude":5},"reason":"Modern, approachable UX with a powerful flow/stage engine, broad protocol support, and a fast-improving open-source project that self-hosters genuinely enjoy operating."}],"perModel":{"ChatGPT":[{"rank":1,"product":"Keycloak","reason":"The best all-round value: mature, fully open-source, highly extensible, and unusually broad across OIDC, OAuth, SAML, federation, organizations, passkeys, authorization, and deployment patterns. It narrowly beats ZITADEL when protocol breadth, longevity, and avoiding feature licenses matter most.","fix":"Production customization and multi-cluster operation demand substantial identity and platform expertise; SCIM remains preview-grade."},{"rank":2,"product":"ZITADEL","reason":"Near-tied with Keycloak and arguably better for greenfield B2B SaaS: first-class organizations and projects, strong delegated administration, API-first automation, passkeys, SAML/OIDC, SCIM, and comprehensive audit events in a comparatively efficient package.","fix":"Its smaller ecosystem and more opinionated architecture make unusual integrations, troubleshooting, and migrations riskier than with Keycloak."},{"rank":3,"product":"FusionAuth","reason":"A polished, purpose-built CIAM server with straightforward self-hosting, strong APIs and documentation, flexible theming, real tenant isolation, broad login methods, and good migration tooling; typically faster to operationalize than Keycloak.","fix":"It is proprietary open-core software, and capabilities such as SCIM, advanced threat detection, tenant administration, and parts of WebAuthn require licenses."},{"rank":4,"product":"Logto","reason":"The most approachable modern option for product teams, with excellent hosted-login UX, clean SDKs and management APIs, organizations, organization RBAC, enterprise SSO, MFA, passkeys, and simple PostgreSQL-based deployment.","fix":"The self-hosted edition has commercial restrictions, including a three-SAML-app limit, and its ecosystem and operational track record remain narrower than the leaders’."},{"rank":5,"product":"Ory","reason":"Its Kratos and Hydra stack offers exceptional headless flexibility, strong standards foundations, customizable identity schemas and flows, passkeys/MFA, and proven OAuth/OIDC scalability; it is ideal when the identity experience must be deeply product-specific.","fix":"It is a toolkit rather than a turnkey CIAM: teams must assemble services, build or adapt user interfaces, and own considerably more integration and operations work."}],"Claude":[{"rank":1,"product":"Keycloak","reason":"The mature, battle-tested standard for self-hosting — full OIDC/OAuth2/SAML, identity brokering, social login, fine-grained authz, and a vast community with abundant tutorials, operators, and Kubernetes tooling; Red Hat backing means it isn't going anywhere and it costs nothing.","fix":"Heavy JVM footprint and operationally complex to run reliably at scale; its lineage is workforce/enterprise IAM, so consumer-scale UX customization and high-volume tuning take real effort, and the admin experience feels dated."},{"rank":2,"product":"ZITADEL","reason":"Purpose-built modern CIAM — multi-tenancy, event-sourced audit trail by design, strong B2B/organization modeling, passkeys/FIDO2 first-class, clean APIs and good DX; a genuinely current architecture rather than a retrofitted legacy one.","fix":"Younger ecosystem and smaller community than Keycloak; the event-sourcing + Postgres/CockroachDB storage model adds operational learning curve, and you'll hit fewer prewritten answers when troubleshooting."},{"rank":3,"product":"FusionAuth","reason":"The most CIAM-focused of the bunch with a polished admin console, excellent documentation, generous self-host tier, and thoughtful consumer features (themes, MFA, lambdas, per-application tenanting) that make it fast to ship a real product.","fix":"Source-available, not truly open source, and single-vendor — several advanced features sit behind paid editions, so you're accepting lock-in and a licensing ceiling."},{"rank":4,"product":"Ory","reason":"API-first, headless, cloud-native building blocks that give maximum flexibility and clean separation of concerns; ideal when you want to own the UI entirely and compose exactly the flows and authz model you need at scale.","fix":"Not a turnkey product — no bundled login UI and multiple services to wire together, so it demands significant engineering investment and is overkill for teams wanting something that works out of the box."},{"rank":5,"product":"Authentik","reason":"Modern, approachable UX with a powerful flow/stage engine, broad protocol support, and a fast-improving open-source project that self-hosters genuinely enjoy operating.","fix":"Its center of gravity is workforce SSO/application access rather than high-volume consumer identity, some enterprise features are paid, and it's backed by a comparatively small team."}],"Gemini":[{"rank":1,"product":"Keycloak","reason":"Battle-tested open-source benchmark for enterprise CIAM offering complete protocol support (OIDC, OAuth2, SAML 2.0), robust user federation, fine-grained access control, and deep Java SPI customization. Ranked top under the assumption that long-term protocol stability and zero-vendor-lock-in outweigh setup complexity for typical enterprise deployments.","fix":"High memory footprint and a steep administration learning curve make simple app integrations unnecessarily over-engineered for lean teams."},{"rank":2,"product":"FusionAuth","reason":"Purpose-built for customer identity with native multi-tenancy, flexible user data schemas, high-throughput performance, and webhooks designed for custom registration flows. Shares a near-tie with Keycloak for teams prioritizing rapid developer onboarding over pure open-source licensing.","fix":"Advanced enterprise capabilities like multi-region database sync, advanced SAML, and dedicated support require paid commercial licenses despite the free self-hosted edition."},{"rank":3,"product":"ZITADEL","reason":"Modern Go-based, cloud-native identity platform offering first-class multi-tenancy, native Passkeys/WebAuthn support, built-in immutable audit logs, and lightweight resource usage out of the box.","fix":"Younger project ecosystem with significantly fewer third-party integrations and smaller community documentation compared to established industry giants."},{"rank":4,"product":"SuperTokens","reason":"Developer-first architecture delivering pre-built UI components and modular backend SDKs that embed directly into web and mobile codebases, giving teams complete control over user data with minimal setup overhead.","fix":"Focuses tightly on modern web/mobile authentication and session management, lacking built-in support for legacy enterprise SAML federation without third-party bridges."},{"rank":5,"product":"Ory","reason":"Headless, API-only identity management providing strict security isolation, zero UI opinions for complete frontend design freedom, and high-performance Go microservice deployment.","fix":"Offers no out-of-the-box user interfaces, creating high initial developer overhead to build and maintain all login, registration, and account recovery screens."}]},"missedByModel":{"ChatGPT":[{"product":"SuperTokens","reason":"excellent embedded authentication and session management, but important CIAM capabilities such as multi-tenancy, MFA, and unified OAuth-provider behavior are paid and its SDK-centric architecture is less broadly interoperable"},{"product":"authentik","reason":"strong self-hosted SSO and application-access platform, but its center of gravity remains workforce and homelab access rather than customer-facing B2B organization workflows"}],"Claude":[{"product":"Logto","reason":"excellent developer-first modern CIAM and strong for startups, but younger with a smaller ecosystem and less proven at large scale"},{"product":"Supabase Auth / GoTrue","reason":"great value when you're already in the Supabase/Postgres stack, but thin as a standalone, protocol-complete CIAM outside that ecosystem"}],"Gemini":[{"product":"Authentik","reason":"engineered primarily for internal workforce SSO and IT infrastructure access control rather than customer-facing application registration and user flows"},{"product":"Logto","reason":"provides an impressive Auth0-like developer experience, but has a less mature track record for complex enterprise multi-tenant customizations"}]}}