Postgres vs. Supabase vs. Firebase for startup backends in 2026

“Which database?” is really three questions:

1. Data model — relational vs document vs realtime-first
2. Who operates it — you, a platform, or a BaaS
3. Exit strategy — how painful is migration at month 18?

PostgreSQL (self-managed or RDS-style)

Best when: you want maximum control, predictable SQL, and team comfort with migrations.

Pros

• Mature ecosystem, strong consistency
• Works with any ORM (Drizzle, Prisma, etc.)
• Easy to reason about backups and replicas

Cons

• You own auth, APIs, and realtime unless you add layers
• Ops time is real even on managed RDS/Cloud SQL

Official reference: PostgreSQL documentation.

Supabase (Postgres + platform)

Best when: you want Postgres plus auth, storage, and APIs fast — common for Next.js startups.

Pros

• Real Postgres under the hood — less lock-in than pure document BaaS
• Auth and row-level security patterns for multi-tenant apps
• Good DX for MVPs that may grow into serious products

Cons

• Platform limits and pricing tiers matter at scale
• Complex edge cases still need custom backend code

See Supabase docs for RLS and auth patterns.

Firebase (Google)

Best when: mobile-first, rapid prototyping, heavy realtime, and your team already lives in Google Cloud.

Pros

• Extremely fast for certain app shapes
• Strong mobile SDK story

Cons

• Query and reporting patterns can hurt later
• Migration off Firebase is a known pain point — plan early if enterprise buyers appear

Decision matrix (simplified)

Pairing with your frontend

Most Brimode clients on custom software use Next.js + Postgres (often via Supabase early, then evolve). Marketing sites may stay on Webflow while product uses a separate stack — see Webflow vs custom.

Before you commit

• Model your tenancy (single DB vs schema per tenant)
• Write down backup and restore drill once
• Load-test the one query that will run on every dashboard load

Get backend architecture help before your schema becomes archaeology.