Firebase vs Supabase in 2025: Which one actually scales with you ...

### Firebase’s problems at scale 1. **Lock-in is real** - Firebase isn’t just a tool. It’s an ecosystem. - Your backend logic lives in Cloud Functions, your data in Firestore or Realtime DB, your auth rules in a custom DSL. - Migrating *anything* becomes painful. **2. Querying Firestore gets weird fast** - No joins. Limited where clauses. You start doing gymnastics with data duplication and client-side merging. - Performance suffers — and so does your sanity. **3. Debugging is painful** - Ever tried debugging a Firebase rule mismatch at 2 a.m.? Good luck. - Logs are spread across tools. Testing access control becomes trial-and-error. ### Supabase’s problems at scale 1. **You own the ops (even if they hide it)** - Sure, Supabase is “hosted,” but you’re closer to the DB. - Bad queries = bad performance. - You’ll need to think like a backend dev eventually (indexes, auth layers, rate limits). **2. DevEx gaps still exist** - The dashboard UI and auth workflows aren’t as frictionless as Firebase. - Docs are good, but edge cases can take digging. - Community is smaller (but growing fast).