Blog

Notes from the lab — what we're building, and why.

db4: local RAG on Postgres in a browser tab

October 20, 2026

db4 is open source: local RAG on Postgres in a browser tab

db4 runs real Postgres inside a browser tab, with vector search in plain SQL, so a local LLM can do RAG over your data and nothing leaves your machine. psql, ORMs and MCP clients connect too. Now MIT-licensed on GitHub.

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October 18, 2026

Android SBS is coming back for 2026

The 2017 cult app that put your whole phone in VR is being rebuilt from scratch. Here's the plan — and how to get in first.

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October 10, 2026

Welcome to the Lab4 blog

A place for build notes, launches, and the occasional experiment that didn't make it.

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