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Firebase Authentication

Auth & Identity Free tier (card may be required)

AuthenticationFree tier (card may be required)
Rate limitFree: 50,000 monthly active users for standard auth, 50 for SAML/OIDC, first 10 SMS per day free; phone auth needs the Blaze plan.

Documentation: firebase.google.com ยท Checked Sep 13, 2026

About

Firebase Authentication is Google's hosted login service for email-password, phone, and social sign-in, usable through client SDKs and a REST API. The free Spark plan covers 50,000 monthly active users for standard authentication and 50 monthly users for SAML and OIDC enterprise providers, with the first 10 SMS verifications per day free. Phone authentication beyond that requires the pay-as-you-go Blaze plan. It is separate from Firebase's Firestore database and pairs well with any Google Cloud backend.

Details

Free tier, but a card may be required to sign up.

Auth: Free tier (card may be required)

Rate limit: Free: 50,000 monthly active users for standard auth, 50 for SAML/OIDC, first 10 SMS per day free; phone auth needs the Blaze plan.

Verified: 2026-09-13

Best for: mobile login social sign-in Google ecosystem

Read the docs Back to catalog

Setup

  1. Create a free Firebase project in the console.
  2. Enable Authentication and turn on the sign-in methods you want.
  3. Register your app and copy the API key and project config.
  4. Install the Firebase Auth SDK for your platform.
  5. Sign users in with the SDK or call the Identity Platform REST endpoints.
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