Trade-offs and a Firebase Checklist

Choosing and reviewing

Firebase excels at fast delivery, realtime sync, offline-capable mobile apps and managed auth, at the cost of a NoSQL model without joins, per-operation pricing and platform lock-in. Supabase offers a Postgres database with SQL, joins and row-level security, which suits relational data and teams that know SQL. A custom backend gives full control and portability but you own servers, scaling and security. Many teams mix them, for example Firebase Auth and FCM with a separate database. Before launch, review: rules tested and deployed from the repo, App Check enabled, no secrets in clients, queries bounded and indexed, trusted logic in functions, costs alerted, and backups or exports planned.

The checklist

Use it before launch and in reviews.

[ ] separate projects for dev / staging / production
[ ] Security Rules: deny by default, owner and role checks, field validation
[ ] rules unit tests run against emulators in CI
[ ] App Check enabled; API key restricted where possible
[ ] no secrets in client code; functions use defineSecret
[ ] trusted operations (payments, roles, counters) in Cloud Functions
[ ] data modelled for queries; no unbounded arrays; composite indexes in repo
[ ] every query limited and paginated; listeners unsubscribed
[ ] transactions or batches for multi-document changes; idempotent triggers
[ ] budget alerts and usage dashboards reviewed
[ ] scheduled Firestore exports or backups (check current options)
[ ] Remote Config defaults; staged rollouts watched with Analytics / Crashlytics
[ ] exit plan: data export path if you outgrow the platform

Decide by data shape

If your data is highly relational with complex reporting, weigh a SQL backend; if it is document-shaped and realtime, Firebase is a strong fit.

त्वरित जाँच: Which is a common reason to choose Supabase or a SQL backend over Firestore?

• Wanting managed authentication
• Needing realtime listeners
• Highly relational data that benefits from joins and SQL queries
• Deploying a static site