Firebase Auth

Mobile-first auth from Google

Free tier + paidAuth & user managementfirebase.google.com

What it is

Google's authentication service, strongest on mobile. Standard email and social sign-in is free with no user cap; the upgraded Identity Platform tier is free to 50,000 MAU and then billed through Google Cloud. Phone and SMS verification is billed per message and requires the paid Blaze plan.

Why it earns a slot

Still the least-effort option for a native iOS or Android app, with mature SDKs, offline handling and free anonymous auth for try-before-you-signup flows.

Know before you commit

SMS auth is both a real cost and a fraud target — SMS pumping attacks on Blaze projects have produced large surprise bills. Exporting users is possible, but passwords use a Google-specific scrypt variant that complicates migration.

Getting started

npm i firebase

Field notes

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Pricing snapshot

Free · Identity Platform free to 50k MAU · SMS billed per message

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Drop into your Lovable chat

Evaluate Firebase Auth (https://firebase.google.com/products/auth) for this project, then use it only if it fits what we are already building.
Context: Mobile-first auth from Google. Google's authentication service, strongest on mobile. Standard email and social sign-in is free with no user cap; the upgraded Identity Platform tier is free to 50,000 MAU and then billed through Google Cloud. Phone and SMS verification is billed per message and requires the paid Blaze plan.
Reviewer notes (general, not written for this codebase): Still the least-effort option for a native iOS or Android app, with mature SDKs, offline handling and free anonymous auth for try-before-you-signup flows.
Watch out for: SMS auth is both a real cost and a fraud target — SMS pumping attacks on Blaze projects have produced large surprise bills. Exporting users is possible, but passwords use a Google-specific scrypt variant that complicates migration.
Pricing: Free · Identity Platform free to 50k MAU · SMS billed per message
Setup: npm i firebase
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

/api/public/tools/firebase-auth

Neighbourhood

How Firebase Auth sits against the rest of the atlas — swaps, companions and the tools builders actually save alongside it.