Live demo room resource_demo / page:/demo

Embeddable comments, cursors, drawing, APIs, webhooks, and debug visibility.

Published spaces load the native collaboration bundle through the Spacefast runtime bootstrap.

Viewport-safe anchors

Comment anchors store normalized page coordinates, element selectors, bounding boxes, text quotes, and viewport metadata so responsive layouts can be repaired instead of guessed.

Generic room core

Threads and drawing are wrappers over the same room, presence, broadcast, state, event, webhook, and dashboard infrastructure that can later power game-like state sync.

Anonymous and platform identity

Anonymous ids persist in localStorage, session ids persist per tab, and the one Spacefast visitor token carries identity plus space grants — Cast verifies it and derives capability from the grants.

Try it

Click anywhere on this page while Comment mode is active.
Enter a short comment in the prompt.
Switch to Draw and sketch over the viewport.

Published-space bootstrap

<script async src="/__spacefast/sdk.js" data-spacefast-sdk="v1"></script>

Download Collab JS Open native bundle