Laboratory for Apps

Utilities built for your apps

Lab4 builds focused tools that help you get things done. Every product follows a simple pattern: [Utility]4.app — a tool, for you.

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Products

db4
Open source

db4 — database for your apps

Postgres in a browser tab, now open source.

Real Postgres running in your tab, with local RAG over MCP. Use it at db4.lab4.app; run your own relay to connect psql and AI agents.

db4.lab4.app → GitHub →
rec4

rec4 — recording for your apps

Screen recording made simple.

A fast, lightweight recording tool. Capture, trim, and share — no fluff.

rec4.app →

Upcoming

Waitlist open

Android SBS — your whole phone in VR

The 2017 cult app, rebuilt for 2026.

Your entire Android in VR — any app, side by side, on a $20 headset. Bringing it back for rooted phones. Get on the list and you're first to test it.

Join the waitlist →

About

Lab4 is a software laboratory focused on building practical tools for real use cases.

Built on deep experience across data engineering, infrastructure, and open-source development — with a track record of shipping systems that handle real workloads at scale.

Every product follows the [Utility]4.app pattern — a clear, consistent convention where the name tells you exactly what the tool does, and the 4 means it's built for you.

Data Engineering Infrastructure Open Source PostgreSQL Systems Design Developer Tools