I'm building with Flutter and need user login, what should I use?

For Flutter login, the best choice depends on how much you want to manage yourself.

Best default: use a managed auth service

If you want email/password, social login, password reset, and account management without building everything yourself, use one of these:

• Firebase Authentication — easiest and most common for Flutter
• Supabase Auth — great if you also want a Postgres backend
• Auth0 — very flexible, good for enterprise-style auth
• AWS Cognito — solid, but more complex

My recommendation

• Choose Firebase Auth if you want the fastest path and the simplest Flutter integration.
• Choose Supabase Auth if you want auth plus a SQL database and open-source backend stack.
• Choose Auth0 if you need advanced auth flows, SSO, or enterprise features.

If you need to build it yourself

Only do this if you have a strong reason. A custom auth system means handling:

• passwords securely
• hashing/salting
• refresh tokens
• email verification
• password reset
• MFA
• session storage
• security audits

That’s usually not worth it for most apps.

Typical Flutter stack

A common setup is:

• Flutter UI
• Firebase Auth / Supabase Auth
• State management: Riverpod, Bloc, or Provider
• Secure storage for local tokens if needed

If you want simple email/password login

Use:

• Firebase Auth with firebase_auth
• Google/Apple sign-in if needed

If you want a quick answer

Use Firebase Authentication unless you specifically need SQL backend integration or enterprise auth.

If you want, I can show you:

1. a Flutter login screen example,
2. Firebase Auth setup, or
3. Supabase auth setup.