{"slug":"best-self-hosted-auth-platform","title":"Best self-hosted auth platform","question":"What are the best self-hosted (open-source or downloadable) authentication and identity platforms for web and SaaS apps in 2026?","category":"Backend","url":"https://modelsagree.com/best/best-self-hosted-auth-platform","updated":"2026-07-16","models":["ChatGPT","Claude","Gemini","Grok"],"consensus":"2 of 4 models rank Keycloak the top pick","disagreement":"Gemini picks ZITADEL; Grok picks Authentik","combined":[{"rank":1,"product":"Keycloak","domain":"keycloak.org","score":17,"appearances":4,"modelRanks":{"ChatGPT":1,"Claude":1,"Gemini":2,"Grok":3},"reason":"Best overall balance of mature OIDC/SAML, identity brokering, LDAP/AD federation, fine-grained authorization, organizations, passkeys, extensibility, and zero license cost; especially strong when standards coverage and long-term operability matter"},{"rank":2,"product":"ZITADEL","domain":"zitadel.com","score":17,"appearances":4,"modelRanks":{"ChatGPT":2,"Claude":2,"Gemini":1,"Grok":2},"reason":"Narrowly beats Keycloak for SaaS apps due to its first-class multi-tenant organization isolation, modern Go codebase, and event-sourced audit logging, making it much easier to deploy and scale for client-facing applications."},{"rank":3,"product":"Authentik","domain":"goauthentik.io","score":13,"appearances":4,"modelRanks":{"ChatGPT":4,"Claude":3,"Gemini":3,"Grok":1},"reason":"Excellent modern UI/admin experience, broad protocol support (OIDC/OAuth2/SAML/LDAP/SCIM), proxy/forward-auth mode for easy self-hosted app integration, flexible flows, strong for homelabs/SMB/internal tools + SaaS, active community and polished self-hosting (Docker/K8s)."},{"rank":4,"product":"Ory","domain":"ory.sh","score":4,"appearances":3,"modelRanks":{"ChatGPT":5,"Claude":4,"Grok":5},"reason":"The best headless, API-first option — you own the entire login UI, components compose cleanly (Kratos for identity, Hydra for OAuth2/OIDC, Keto for permissions), it's genuinely cloud-native, and Hydra's OpenID certification is rock solid. Earns its spot for engineering teams building auth as a product surface rather than adopting a boxed IdP."},{"rank":5,"product":"FusionAuth","domain":"fusionauth.io","score":4,"appearances":2,"modelRanks":{"ChatGPT":3,"Claude":5},"reason":"Polished developer experience, straightforward deployment, strong tenant support, customizable hosted pages, passkeys, enterprise federation, and useful migration tooling; ranks highly for teams willing to buy advanced capabilities"},{"rank":6,"product":"Authelia","domain":"authelia.com","score":2,"appearances":1,"modelRanks":{"Grok":4},"reason":"Lightweight, secure forward-auth focused for reverse-proxy protected self-hosted apps, low resource footprint, solid 2FA/ACLs, simple config for typical practitioner protecting internal tools."},{"rank":7,"product":"Logto","domain":"logto.io","score":2,"appearances":1,"modelRanks":{"Gemini":4},"reason":"Offers the absolute best developer experience (DX) and polished, out-of-the-box consumer-grade interfaces, functioning as a direct, self-hosted open-source drop-in replacement for Clerk or Auth0."},{"rank":8,"product":"SuperTokens","domain":"supertokens.com","score":1,"appearances":1,"modelRanks":{"Gemini":5},"reason":"Uses a unique SDK-first, app-embedded architecture that integrates directly into frontend and backend APIs, giving developers complete control over UI and auth flows without redirecting users to a separate portal."}],"perModel":{"ChatGPT":[{"rank":1,"product":"Keycloak","reason":"Best overall balance of mature OIDC/SAML, identity brokering, LDAP/AD federation, fine-grained authorization, organizations, passkeys, extensibility, and zero license cost; especially strong when standards coverage and long-term operability matter","fix":"Operationally heavy and comparatively awkward to customize into a polished, product-native SaaS experience"},{"rank":2,"product":"ZITADEL","reason":"Near-tie with Keycloak for SaaS; excellent organization-native multitenancy, delegated administration, passkeys, service accounts, strong APIs, and modern self-service flows make it the cleaner default for greenfield B2B products","fix":"Its event-driven architecture and self-hosted operations are more complex than simpler PostgreSQL-backed alternatives"},{"rank":3,"product":"FusionAuth","reason":"Polished developer experience, straightforward deployment, strong tenant support, customizable hosted pages, passkeys, enterprise federation, and useful migration tooling; ranks highly for teams willing to buy advanced capabilities","fix":"Important enterprise features and support require paid editions, weakening its value for fully open-source deployments"},{"rank":4,"product":"Authentik","reason":"Excellent self-hosted SSO and identity gateway with OIDC, SAML, LDAP, SCIM, proxy authentication, flexible visual flows, and a notably approachable admin experience","fix":"Better suited to securing organizations and existing applications than serving as deeply embedded, high-scale customer identity infrastructure for a SaaS product"},{"rank":5,"product":"Ory","reason":"Strong headless, API-first identity components with excellent protocol foundations and unusually flexible control over registration, login, sessions, consent, and UI; ideal for teams building identity deeply into their product","fix":"The composable architecture shifts substantial integration, UI, policy, and operational work onto the application team"}],"Claude":[{"rank":1,"product":"Keycloak","reason":"The most complete self-hosted IdP by a wide margin — OIDC/OAuth2/SAML, user federation (LDAP/AD), fine-grained authorization, identity brokering, and passkeys, all battle-tested at enterprise scale with CNCF backing and Red Hat's commercial build (RHBK) behind it; the Quarkus rewrite fixed most of the old resource-hunger complaints. Assumption: the typical practitioner wants one server that can handle whatever auth requirement shows up next year, which rewards breadth and maturity over elegance.","fix":"Operationally heavy and admin-UX-dense — themes, SPIs, and realm config have a steep learning curve, and it's overkill for a single small app that just needs login."},{"rank":2,"product":"ZITADEL","reason":"The strongest modern challenger — Go-based single binary, first-class multi-tenancy (organizations/projects) that SaaS builders actually need, event-sourced audit trail, good passkey and OIDC/SAML support, and a clean API-first design with a permissive-enough license and managed-cloud escape hatch. Near-tie with Authentik; Zitadel wins for SaaS/B2B multi-tenant use cases specifically.","fix":"Smaller ecosystem and community than Keycloak, and its opinionated event-sourced architecture plus login-UI customization model can fight you when you need deep bespoke flows."},{"rank":3,"product":"Authentik","reason":"The best experience for teams that want a self-hosted IdP that's pleasant to run — polished admin UI, visual flow designer for custom auth journeys, built-in outpost proxy for protecting legacy/non-OIDC apps, and broad protocol coverage (OIDC, SAML, LDAP, RADIUS, SCIM); it has become the default for homelab-to-mid-size-company deployments.","fix":"Python/Django stack scales less predictably at high volume, and its enterprise-gated features plus smaller security-research track record make conservative enterprises pick Keycloak instead."},{"rank":4,"product":"Ory","reason":"The best headless, API-first option — you own the entire login UI, components compose cleanly (Kratos for identity, Hydra for OAuth2/OIDC, Keto for permissions), it's genuinely cloud-native, and Hydra's OpenID certification is rock solid. Earns its spot for engineering teams building auth as a product surface rather than adopting a boxed IdP.","fix":"You assemble it yourself — no batteries-included admin console or ready UI, multiple services to operate, and the open-source vs. Ory Network feature split requires reading the fine print; wrong choice for teams that want auth done this week."},{"rank":5,"product":"FusionAuth","reason":"The strongest downloadable commercial option — free unlimited-user community edition you self-host, excellent developer docs, clean tenanting, every OAuth/OIDC grant done correctly, and paid tiers add advanced MFA and threat detection with real vendor support behind it; a pragmatic pick for teams that want Keycloak-class capability with a company on the hook.","fix":"Not open source (source-available/proprietary core), so the best features sit behind license fees and you're exposed to vendor pricing changes in a way Keycloak/Authentik users aren't."}],"Gemini":[{"rank":1,"product":"ZITADEL","reason":"Narrowly beats Keycloak for SaaS apps due to its first-class multi-tenant organization isolation, modern Go codebase, and event-sourced audit logging, making it much easier to deploy and scale for client-facing applications.","fix":"Not built for legacy enterprise setups needing deep Active Directory forest synchronization or complex visual policy flow editors."},{"rank":2,"product":"Keycloak","reason":"The battle-tested industry standard with unmatched protocol support (OIDC, SAML, OAuth 2.0), comprehensive enterprise directory federation (LDAP, Active Directory), and a massive ecosystem of extensions.","fix":"High operational overhead due to its heavy JVM/Quarkus footprint and complex upgrade paths that require dedicated DevOps support."},{"rank":3,"product":"Authentik","reason":"Offers a highly flexible, visual flow-based policy editor for designing complex auth pipelines (MFA, step-up auth, account linking) combined with strong support for forward proxying and LDAP/SCIM out of the box.","fix":"Relies on a resource-heavy stack (PostgreSQL, Redis, Celery) that is over-engineered for simple apps, and its GitOps configuration is less mature than its UI."},{"rank":4,"product":"Logto","reason":"Offers the absolute best developer experience (DX) and polished, out-of-the-box consumer-grade interfaces, functioning as a direct, self-hosted open-source drop-in replacement for Clerk or Auth0.","fix":"Lacks advanced enterprise features like complex B2B multi-tenant federation and native LDAP directory synchronization found in Zitadel or Keycloak."},{"rank":5,"product":"SuperTokens","reason":"Uses a unique SDK-first, app-embedded architecture that integrates directly into frontend and backend APIs, giving developers complete control over UI and auth flows without redirecting users to a separate portal.","fix":"Lacks a centralized visual admin/management dashboard out of the box and is not designed to serve as a standalone identity provider (IdP) for SSO."}],"Grok":[{"rank":1,"product":"Authentik","reason":"Excellent modern UI/admin experience, broad protocol support (OIDC/OAuth2/SAML/LDAP/SCIM), proxy/forward-auth mode for easy self-hosted app integration, flexible flows, strong for homelabs/SMB/internal tools + SaaS, active community and polished self-hosting (Docker/K8s).","fix":null},{"rank":2,"product":"ZITADEL","reason":"Cloud-native Go-based, excellent multi-tenancy/organizations for B2B SaaS, API-first/developer-friendly, strong audit/event sourcing, passkeys/MFA, efficient self-hosting (low overhead, K8s-friendly), modern alternative to legacy systems.","fix":null},{"rank":3,"product":"Keycloak","reason":"Battle-tested (Red Hat-backed), broadest enterprise protocol/federation support (incl. LDAP/AD/SAML/Kerberos), full-featured realms/authorization, proven at scale for complex orgs.","fix":null},{"rank":4,"product":"Authelia","reason":"Lightweight, secure forward-auth focused for reverse-proxy protected self-hosted apps, low resource footprint, solid 2FA/ACLs, simple config for typical practitioner protecting internal tools.","fix":null},{"rank":5,"product":"Ory","reason":"Highly modular/cloud-native, flexible for custom auth/authorization (Zanzibar permissions), strong for developers building tailored SaaS flows, open protocols.","fix":null}]},"missedByModel":{"ChatGPT":[{"product":"SuperTokens","reason":"excellent application-native sessions and customizable login SDKs, but paid multitenancy and narrower federation breadth reduce self-hosted value"},{"product":"Casdoor","reason":"broad protocols and integrations at low cost, but documentation, polish, and operational confidence trail the top five"}],"Claude":[{"product":"SuperTokens","reason":"great embeddable OSS auth for a single app with prebuilt UI components, but it's an auth library/service for your app more than a full standalone IdP — weaker SAML/federation story"}],"Gemini":[{"product":"Ory Kratos","reason":"requires orchestrating separate components like Hydra and Keto and building a custom UI, creating high operational complexity for typical SaaS teams"},{"product":"Authelia","reason":"designed primarily as a lightweight reverse-proxy gateway for homelabs rather than a full customer identity provider for web apps"}],"Grok":[{"product":"FusionAuth","reason":"strong self-hostable with good features but core not fully open-source, commercial lean"}]}}