Firebase Auth

Firebase Auth provides a complete identity system with pre-built UI and SDKs for email, social, and phone-based authentication.

Google manages the heavy lifting of secure credential storage and account recovery so you can focus on your app. The platform supports industry standards like OAuth 2.0 and OpenID Connect, integrating seamlessly with providers like Google, Apple, and GitHub. You get a drop-in UI library (FirebaseUI) to handle complex flows like password resets and multi-factor authentication (MFA) with minimal code. It scales automatically to millions of users while maintaining tight integration with the broader Firebase ecosystem, including Firestore and Cloud Functions.

https://firebase.google.com/docs/auth