Supabase vs Firebase for Production MVPs (Not Prototypes)

Data Model Philosophy

Firebase is document-store (Firestore) or Realtime DB — great for simple hierarchies, chat, live sync. Painful for relational reporting ("users who subscribed in March with >3 orders"). Supabase is Postgres — SQL, joins, views, Row Level Security. If your product is dashboards, marketplaces, or anything invoice-like, Postgres wins early.

Auth and Security

Both offer email, OAuth, magic links. Supabase RLS policies live in the database — powerful once you learn them. Firebase Security Rules are JSON on collections — fine for simple apps, brittle at scale. For multi-tenant B2B SaaS, teams often prefer RLS + explicit schemas.

Pricing Reality

Firebase free tier is generous for prototypes; Firestore reads scale with usage and surprise bills are common on viral spikes. Supabase pricing is more predictable for steady SaaS (fixed tiers + usage). Neither is "free at scale." Budget backend costs in financial models after 10k MAU.

Ecosystem and Lock-in

Firebase is Google — excellent mobile SDKs, Cloud Functions, FCM push, Analytics integration. Leaving Firebase means rewriting rules, functions, and often client data layers. Supabase is closer to portable Postgres — you can export and self-host or move to RDS. Lock-in matters if acquirers or investors ask about infrastructure independence.

• Choose Firebase: real-time collab, mobile-first, heavy Google stack
• Choose Supabase: SQL, B2B SaaS, complex permissions, Stripe sync
• Hybrid exists but avoid two sources of truth in v1
• Either beats rolling your own auth in 2026

Our Default for Client MVPs

We default to Supabase for SaaS, marketplaces, and apps needing admin reporting. Firebase when the product is mobile-native with heavy offline sync and push-first UX. Wrong choice isn't fatal — migrating at 50k users is. Get v1 live with eyes open.