Alternatives to Auth0

Identity infrastructure, simplified

ZITADEL is a self-contained identity platform: login, signup, SSO, multi-factor auth, user roles, all in one. It's an alternative to Auth0 or Clerk that you can self-host for free.

Open source alternative to Auth0/Firebase Auth/Cognito

SuperTokens is the open source authentication platform: signup, password reset, social login, multi-factor auth, without Auth0 prices or Firebase lock-in. It handles session management, email verification, passwordless login, and social OAuth out of the box.

Headless cloud-native identity management

Ory Kratos is a headless identity server that handles login, registration, password recovery, and account management without depending on Auth0. It handles the backend logic: password hashing, session management, MFA, social sign-in, and you build whatever frontend you want on top of its API.

Auth infrastructure for SaaS and AI apps

Logto is an auth platform you can self-host for free or use their cloud: login, signup, SSO, MFA, and user management for SaaS apps. Drop in their SDK, get a polished login experience, manage users through their admin console, done.

Flexible identity provider

SSO (single sign-on), multi-factor auth, user directories, all in one place. The open source version is extremely capable.