Who is Firebase Authentication best for?

Best use cases for Firebase Authentication

• Applications built on the Firebase/Google Cloud ecosystem where authentication integrates natively with Firestore, Realtime Database, Cloud Storage security rules, and Firebase Cloud Messaging.
• Mobile applications (iOS, Android) where Firebase Authentication's native SDK handles token management, session persistence, and re-authentication flows without custom backend work.
• Teams that want phone number authentication with Google's SMS delivery infrastructure — Firebase's phone auth is among the easiest phone verification implementations available for mobile apps.

Who should avoid Firebase Authentication?

• You need enterprise SSO and provisioning as a core requirement
• You need sophisticated B2B org/role governance out of the box
• You require deep customization of identity flows and policies
• You want cloud-provider neutrality
• Your buyer requires formal identity governance controls

Upgrade triggers for Firebase Authentication

• Need enterprise SSO for B2B deals (pushes toward Auth0/Entra)
• Need stronger governance and audit capabilities
• Need multi-tenant SaaS access controls and org structures
• Need to control phone auth costs and abuse at scale
• Need higher compliance guarantees for regulated customers

Next steps