I’m building a mobile app and need Apple, Google, and Microsoft login

If you need Apple, Google, and Microsoft login in a mobile app, the usual approach is:

Recommended architecture

Use a single auth backend that supports multiple identity providers, then have the mobile app talk to that backend.

Common options:

• Firebase Authentication
• Auth0
• AWS Cognito
• Supabase Auth
• Your own OAuth/OIDC backend

For mobile apps, this is typically the cleanest setup because each provider has slightly different login flows and platform requirements.

What you’ll need

1) Apple Sign In

• Required if you offer other social logins in iOS apps.
• Uses Sign in with Apple
• You’ll need:
  • Apple Developer account
  • Service ID / App ID
  • Key for token exchange if using backend validation

2) Google Sign-In

• Use OAuth 2.0 / OpenID Connect
• You’ll need:
  • Google Cloud project
  • OAuth client IDs for iOS and Android
  • URL scheme / reversed client ID setup on mobile

3) Microsoft Sign-In

• Use Microsoft Identity Platform (OAuth 2.0 / OIDC)
• You’ll need:
  • Azure app registration
  • Redirect URI setup
  • Scopes like openid, profile, email, and possibly Microsoft Graph scopes

Typical mobile flow

1. User taps Apple/Google/Microsoft button
2. App launches provider sign-in flow
3. Provider returns an authorization code / ID token
4. App sends that token to your backend
5. Backend verifies token with the provider
6. Backend creates or links the user account
7. Backend issues your app’s session token (JWT, Firebase session, etc.)

Good implementation choices

Easiest

• Firebase Auth
  Supports:
• Apple
• Google
• Microsoft via custom OIDC or SAML integration depending on setup

More flexible

• Auth0
  Very strong multi-provider support, good for mobile apps.

Enterprise-friendly

• Azure AD B2C / Entra External ID Good if Microsoft identity is central and you want a unified identity platform.

Important mobile notes

• Prefer system browser / ASWebAuthenticationSession or platform-native SDKs over embedded WebViews.
• Use PKCE for OAuth flows.
• Validate tokens server-side.
• Handle account linking carefully so the same person can use Apple one day and Google the next.

Suggested stack

If you want fastest time to market:

• Flutter / React Native / native app
• Firebase Auth or Auth0
• Backend verifies tokens and issues app session

If you want, I can help you with one of these next:

1. a step-by-step setup guide for Apple/Google/Microsoft login
2. a Flutter / React Native / iOS / Android code example
3. a recommendation for the best auth provider for your app