Firebase Authentication
Work on Firebase Authentication? Verify this listing (free)Google's drop-in auth for web and mobile apps
Email/password, email link, phone and social sign-in with SDKs for web, iOS, Android and Flutter, part of Firebase. Upgrading to Identity Platform adds SAML/OIDC, MFA and blocking functions.
Best for: Mobile and Flutter apps, or projects already on Firebase and Google Cloud
Visit Firebase Authentication ↗- Pricing
- No-cost Spark plan; with Identity Platform, no-cost up to 50K MAU (50 MAU for SAML/OIDC), then Google Cloud pricing; phone verification SMS is Blaze (pay-as-you-go) only and billed per SMS
- Free tier
- Yes: no-cost on the Spark plan; with Identity Platform free up to 50K MAU (Spark caps Identity Platform at 3,000 daily active users, and password-reset emails at 150/day)
- Open source
- No
- Last verified
- 2026-10-24
Firebase Authentication pricing breakdown, history and cheaper alternatives →
Sources (checked 2026-10-24): firebase.google.com/pricing · firebase.google.com/docs/auth/limits
Score breakdown
- Fit for the use case19 / 25
- Vibe-coder friendliness12 / 15
- Output quality & reliability13 / 15
- Pricing & free tier13 / 15
- Ecosystem & integrations9 / 10
- Momentum5 / 10
- Code ownership & lock-in3 / 10
Why this score: Battle-tested, free for most small apps and excellent on mobile. Lock-in to Google, tight Spark-plan email quotas and less momentum among web vibe coders than Supabase Auth or Clerk.
Based on desk research of official pricing pages and docs; see methodology.
FAQ
- Is Firebase Authentication free?
- Firebase Authentication free tier: Yes: no-cost on the Spark plan; with Identity Platform free up to 50K MAU (Spark caps Identity Platform at 3,000 daily active users, and password-reset emails at 150/day). Paid pricing: No-cost Spark plan; with Identity Platform, no-cost up to 50K MAU (50 MAU for SAML/OIDC), then Google Cloud pricing; phone verification SMS is Blaze (pay-as-you-go) only and billed per SMS.
- What is Firebase Authentication pricing in 2026?
- Firebase Authentication pricing (as of our last verification on 2026-10-24): No-cost Spark plan; with Identity Platform, no-cost up to 50K MAU (50 MAU for SAML/OIDC), then Google Cloud pricing; phone verification SMS is Blaze (pay-as-you-go) only and billed per SMS. Always confirm on the official site — plans change.
- Is Firebase Authentication open source?
- No. Firebase Authentication is not open source.
- What is Firebase Authentication's PromptToProd score?
- Firebase Authentication scores 74/100 on PromptToProd (fit, vibe-coder friendliness, quality, pricing, ecosystem, momentum, ownership). See the score breakdown on this page and our methodology.
- What is Firebase Authentication best for?
- Firebase Authentication is best for: Mobile and Flutter apps, or projects already on Firebase and Google Cloud.
- When was Firebase Authentication last verified on PromptToProd?
- Pricing and details for Firebase Authentication were last verified on 2026-10-24 from official docs and pricing pages.
Alternatives
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