Website and live demo · Download for Mac · Contributing

spool is a local-first prototyping canvas for websites, apps and presentations. Your agent writes live TSX frames into your repo, and you play the flows between them like a real app.

Free on your Mac, with the source on GitHub. Spool Cloud for teams, from $16 a seat. Pre-1.0, actively developed and used every day.

Get spool

Mac app

Download Spool for Mac

Apple silicon, macOS 14 or later. Includes everything you need and updates itself.

Command line

npm i -g spool.page
cd your-product
spool init

Node 22.19 or later. macOS and Linux; on Windows, use WSL. Open the canvas in Chrome.

If your npm setup blocks dependency install scripts, use npm i -g spool.page --allow-scripts=esbuild to permit esbuild’s required install script.

Work with your agent

The agent rail runs the agent you already use, Claude Code, Codex or pi,…