* [ Email Link Authentication  ](/docs/auth/android/email-link-auth)
      * [ Google  ](/docs/auth/android/google-signin)
      * [ Facebook Login  ](/docs/auth/android/facebook-login)
      * [ Sign in with Apple  ](/docs/auth/android/apple)
      * [ Twitter  ](/docs/auth/android/twitter-login)
      * [ GitHub  ](/docs/auth/android/github-auth)
      * [ Microsoft  ](/docs/auth/android/microsoft-oauth)
      * [ Yahoo  ](/docs/auth/android/yahoo-oauth)
      * [ Play Games Sign-in  ](/docs/auth/android/play-games)
      * [ Phone Number  ](/docs/auth/android/phone-auth)
      * [ OpenID Connect  ](/docs/auth/android/openid-connect)
      * [ Use a Custom Auth System  ](/docs/auth/android/custom-auth)
      * [ Anonymous Authentication  ](/docs/auth/android/anonymous-auth)
      * [ SMS Multi-factor Auth  ](/docs/auth/android/multi-factor)
      * [ TOTP Multi-factor Auth  ](/docs/auth/android/totp-mfa)
      * [ Link Multiple Auth Providers  ](/docs/auth/android/account-linking)
      * [ Passing State in Email Actions  ](/docs/auth/android/passing-state-in-email-actions)

    * Flutter 

      * [ Get Started  ](/docs/auth/flutter/start)
      * [ Manage Users  ](/docs/auth/flutter/manage-users)
      * [ Password Authentication  ](/docs/auth/flutter/password-auth)
      * [ Email Link Authentication  ](/docs/auth/flutter/email-link-auth)
      * [ Federated Identity & Social  ](/docs/auth/flutter/federated-auth)
      * [ Phone Number  ](/docs/auth/flutter/phone-auth)
      * [ Use a Custom Auth System  ](/docs/auth/flutter/custom-auth)
      * [ Anonymous Authentication  ](/docs/auth/flutter/anonymous-auth)
      * [ Multi-factor Auth  ](/docs/auth/flutter/multi-factor)
      * [ Link Multiple Auth Providers  ](/docs/auth/flutter/account-linking)
      * [ Passing State in Email Actions  ](/docs/auth/flutter/passing-state-in-email-actions)
      * [ Handle Errors  ](/docs/auth/flutter/errors)

    * Web 

      * [ Sign in with a pre-built UI  ](/docs/auth/web/firebaseui)
      * [ Get Started  ](/docs/auth/web/start)
      * [ Manage Users  ](/docs/auth/web/manage-users)
      * [ Password Authentication  ](/docs/auth/web/password-auth)
      * [ Email Link Authentication  ](/docs/auth/web/email-link-auth)
      * [ Google  ](/docs/auth/web/google-signin)
      * [ Facebook Login  ](/docs/auth/web/facebook-login)
      * [ Sign in with Apple  ](/docs/auth/web/apple)
      * [ Twitter  ](/docs/auth/web/twitter-login)
      * [ GitHub  ](/docs/auth/web/github-auth)
      * [ Microsoft  ](/docs/auth/web/microsoft-oauth)
      * [ Yahoo  ](/docs/auth/web/yahoo-oauth)
      * [ Phone Number  ](/docs/auth/web/phone-auth)
      * [ OpenID Connect  ](/docs/auth/web/openid-connect)
      * [ SAML  ](/docs/auth/web/saml)
      * [ Use a Custom Auth System  ](/docs/auth/web/custom-auth)
      * [ Anonymous Authentication  ](/docs/auth/web/anonymous-auth)
      * [ SMS Multi-factor Auth  ](/docs/auth/web/multi-factor)
      * [ TOTP Multi-factor Auth  ](/docs/auth/web/totp-mfa)
      * [ Link Multiple Auth Providers  ](/docs/auth/web/account-linking)
      * [ Customize Dependencies  ](/docs/auth/web/custom-dependencies)
      * [ OAuth Sign-In for Cordova  ](/docs/auth/web/cordova)
      * [ Sign in users from a Chrome extension  ](/docs/auth/web/chrome-extension)
      * [ Auth State Persistence  ](/docs/auth/web/auth-state-persistence)
      * [ Passing State in Email Actions  ](/docs/auth/web/passing-state-in-email-actions)
      * [ Service Worker Sessions  ](/docs/auth/web/service-worker-sessions)
      * [ Best practices for signInWithRedirect flows  ](/docs/auth/web/redirect-best-practices)

    * C++ 

      * [ Get Started  ](/docs/auth/cpp/start)
      * [ Manage Users  ](/docs/auth/cpp/manage-users)
      * [ Password Authentication  ](/docs/auth/cpp/password-auth)
      * [ Google  ](/docs/auth/cpp/google-signin)
      * [ Play Games Sign-in  ](/docs/auth/cpp/play-games)
      * [ GitHub  ](/docs/auth/cpp/githu