Open source alternatives to Auth0

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keycloak26.8.2keycloak/keycloak

Open Source Identity and Access Management For Modern Applications and Services

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authentik2026.8.5goauthentik/authentik

The authentication glue you need.

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zitadelv4.20.3zitadel/zitadel

ZITADEL - Identity infrastructure, simplified for you.

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logtov1.46.0logto-io/logto

🧑‍🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.

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casdoorv4.29.0casdoor/casdoor

An open-source Agent-first Identity and Access Management (IAM) /LLM MCP & agent gateway and auth server with web UI supporting OpenClaw, MCP, OAuth, OIDC, SAML, CAS, LDAP, SCIM, WebAuthn, TOTP, MFA, Face ID, Google Workspace, Azure AD

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supertokens-corev12.5.0supertokens/supertokens-core

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

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kratosv26.2.0ory/kratos

Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, Social Sign In, OIDC, Magic Link, Multi-Factor Auth, SMS, SAML, TOTP, and more. Runs everywhere, runs best on Ory Network.

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hankobackend/v3.1.0teamhanko/hanko

Modern authentication, on your terms. Open source alternative to Auth0, Clerk, WorkOS, Stytch.