Launching Open Canvas - a multiplayer site builder with an agent at the cursor.

Most website tools still work the same way: pick a template, fill in the blanks, publish, wait for a reload. I wanted to find out what a builder looks like if you start from a canvas instead with absolutely full control.

Open Canvas lets you design on a free-form 2D canvas - dragging primitives anywhere, not into predefined slots. An AI agent edits at your cursor: describe a change in plain language, preview it, accept it. Invite a teammate and you co-edit in real time with conflict-free sync and Figma-style cursors. And the moment you publish, every open visitor tab updates in under 100ms - no refresh.

Under the hood it runs as a single Cloudflare Worker on serverless Postgres, with a first-class CMS, full version history, a blocking accessibility audit before every publish, AI image generation, custom domains, and HMAC-signed form webhooks - all shipping as clean, framework-free HTML.

It's open source under MIT, and built in the open.

Live: http://opencanvas.aayushman.dev

Code: http://github.com/aayushman-singh/open-canvas

YouTube: https://youtu.be/7BdXAzyKAUo