I spent a weekend using Claude Code to build a small reactive UI library on top of Effect called effect-ui. It’s an experiment in building a UI system entirely on Effect’s primitives like streams, fibers, and scopes, without a virtual DOM or reactive wrappers. Components run once, updates flow through streams. The result was surprisingly coherent and showed how capable Effect already is for UI work.

Find the repo here: https://github.com/stefvw93/effect-ui