Postgres compiled to WASM, running inside your browser

What it does

database.build is a web-based sandbox that spins up real Postgres instances using PGlite, a WASM build of Postgres. Each database runs directly in your browser and persists its data in IndexedDB, so refreshing the tab won’t wipe your schema or rows. An integrated LLM helps generate tables from CSV drops, write reports, create charts, and draft database diagrams.

The interesting bit

The entire query lifecycle happens client-side; there is no remote Postgres container or WebSocket proxy handling the SQL. If you want to move from prototype to production, a deploy worker can push the in-browser database to Supabase.

Key highlights

• Uses PGlite to run a real Postgres engine inside the browser via WebAssembly.
• Data persists across sessions using the browser’s IndexedDB.
• LLM integration for drag-and-drop CSV import, report generation, charting, and diagramming.
• Includes a browser proxy app that tunnels Postgres TCP connections over WebSockets via pg-gateway.
• Monorepo structure with a Next.js frontend and a deploy worker targeting Supabase.

Caveats

• S3 deployment is listed as coming “soon,” so that feature is not yet available.
• The project depends on a local Supabase stack, Redis, and an OpenAI key for development, giving it a heavy local footprint.

Verdict

Worth a look if you want a private playground for prototyping Postgres schemas or exploring data with AI assistance without installing a local server. Skip it if you need a production database or a trivial self-hosting setup.