Firebase Auth
Google's authentication service
Firebase Authentication provides backend services, easy-to-use SDKs, and ready-made UI libraries to authenticate users.
Our Verdict
Firebase Auth is excellent for mobile apps and projects already in the Google ecosystem. Hard to beat on price.
Pros & Cons
Pros
- +Very generous free tier
- +Great mobile SDK support
- +Backed by Google
- +Works with other Firebase services
Cons
- -Vendor lock-in to Google
- -Less customizable UI
- -Complex with non-Firebase backends
Features
Social OAuthYes
Magic Links(Email link sign-in)Yes
MFA/2FAYes
Pre-built UI(FirebaseUI)Yes
Session ManagementYes
Organizations/Teams(Multi-tenancy on Blaze)Yes
Self-hostedNo
Best For
Mobile appsFirebase ecosystemGoogle Cloud users
Pricing
Free tier available
Spark (Free)$0
- - 50K MAU (phone)
- - Unlimited other MAU
- - All providers
Blaze (Pay as you go)$0.0055/MAU
- - Phone auth beyond 50K
- - SAML/OIDC providers
- - Multi-tenancy
Compare Firebase Auth
Alternatives
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Last updated: 2026-01-15