Supabase
Open-source Firebase alternative
What it does
Supabase is an open-source Firebase alternative built on Postgres. You get a managed Postgres database + auto-generated REST and GraphQL APIs, authentication (email/password, magic link, OAuth, SSO, phone/SMS), realtime (WebSocket subscriptions to database changes), storage (S3-compatible object storage with a nice UI), edge functions (Deno), and pgvector for AI/embeddings — all with generous free tiers and clean dashboards. The differentiators vs Firebase: it is Postgres (real SQL, real joins, real migrations, portable), and it is open-source so you can self-host if you outgrow it. The differentiator vs raw Postgres: everything else in the box.
Free tier
Yes
Starts at
$25/mo
Setup
medium
Key features
Integrates with
Vercel, Netlify, GitHub, OpenAI
Who this fits
- Startups and solo devs building web/mobile apps that need a database + auth in an afternoon
- B2B SaaS teams that want Postgres without operating Postgres
- AI-first apps needing pgvector for embeddings and semantic search
- Any team migrating off Firebase who wants SQL back
- Agencies delivering apps that clients can eventually own (open-source escape hatch matters)
- Prototype-to-production teams — Supabase scales meaningfully before you need custom infra
Who it does NOT fit
- Enterprise with strict data-residency + on-prem-only requirements (unless self-hosted, and that is a real ops project)
- Ultra-high-write-volume workloads (millions of writes/sec) — needs specialized infra
- Non-technical businesses that just need a website (this is a developer tool)
- Teams that only need a spreadsheet-database hybrid (Airtable wins there)
- Teams that need a specific SQL Server / Oracle / MySQL for legacy compatibility
Pricing
Real gotchas
- RLS (Row Level Security) is the entire security model. Get it wrong and your DB is publicly readable. Test with an anon key before shipping
- Free-tier projects PAUSE after 7 days idle. Prototypes die silently — set a reminder or upgrade to Pro
- Auto-generated APIs (PostgREST) leak column names via error messages if you do not lock them down
- Realtime subscriptions have per-project connection limits — audit before scaling
- Migrations must be handled deliberately — Supabase gives you SQL migrations but you have to run them (via CLI or dashboard)
- Storage is S3-compatible but pricing is not S3 — model it
- Edge functions use Deno, not Node — some npm packages need adjusting
- pgvector performance depends on index type (IVFFlat, HNSW) — pick the right one for the query pattern
Integrations that matter
Otto’s take on this tool
Recommend Supabase when: user is technical, building a web/mobile app, and needs a database + auth. Best fit for B2B SaaS, AI-first apps (pgvector wins here), and startups. Pairs with Vercel or Netlify (frontend), Next.js/SvelteKit/Nuxt, Stripe, Resend (email), and any AI stack (LangChain, LlamaIndex, direct embeddings). Do NOT recommend for non-technical users, for teams committed to Firebase's real-time model who do not want SQL, or for enterprise with strict data residency (unless they will self-host). If the user is on Firebase and hitting query limitations, Supabase is the natural migration. If they need a hosted Postgres without the rest, Neon is a strong alternative — but Supabase's auth + storage + realtime bundle usually wins for a full app.
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