TL;DR: Both are PostgreSQL under the hood. Supabase is faster to bootstrap (auth, storage, dashboard). Plain Postgres + NextAuth gives you more control and simpler mental model for fixed-scope MVPs. We default to PostgreSQL + NextAuth on every ShipInADay build.
Founders ask whether they need Supabase on day one. The honest answer: you need a relational database and a clear ownership model — the brand on the box matters less than scope.
What Supabase adds
- Hosted Postgres with a nice dashboard
- Built-in auth, storage, and realtime subscriptions
- Client SDKs that feel like Firebase for SQL
- Fast prototypes when your team already knows the stack
What plain PostgreSQL adds
- No vendor-specific SDK lock-in on day one
- Standard SQL migrations you can run anywhere (OVH, RDS, Neon, etc.)
- Pairs cleanly with NextAuth for session + OAuth in Next.js
- Easier to reason about in a 24-hour fixed scope
Comparison for MVP stage
| Need | Supabase | Postgres + NextAuth |
|---|---|---|
| User accounts | Built-in | NextAuth + users table |
| Row-level security | Native policies | App-layer checks (our default) |
| File uploads | Storage bucket | S3/R2 when needed |
| Realtime | Built-in | Defer unless core to v1 |
| Portability | Good SQL export | Excellent — it's just Postgres |
Our default (and why)
Every Launch and Scale tier ships with:
- PostgreSQL 16
- NextAuth (Google + credentials)
- Migrations in-repo (
database/migrations/) user_idownership on project data — no email-only access
That stack answers 90% of founder MVPs without adding a BaaS dependency on day one.
When we recommend Supabase instead
- You already have Supabase in production and need a fast extension
- Realtime collaboration is the product (not a nice-to-have)
- Your team has zero backend capacity and wants the dashboard on day one
Custom tier projects can integrate Supabase when it is explicitly in scope.
FAQ
Can I migrate from Supabase later?
Yes — it's PostgreSQL. Plan for auth migration (sessions, user IDs) as the hard part, not the data.
Do you host the database?
We deploy your MVP with a defined hosting path; production DB strategy is documented at handoff.
Next step
Pick a tier, read what to prepare, and start your request.
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