Doop

Doop is an open-source multiplayer design canvas where people and AI agents create and edit designs together. Each canvas contains frames that render real HTML in sandboxed iframes; humans edit in the browser, while agents connect through the built-in Model Context Protocol (MCP) server and can create frames, stream HTML in chunks, inspect screenshots, and revise designs. The app synchronizes cursors, presence, frame edits, agent status, comments, tasks, and activity over WebSocket rooms, and includes a server-side Doop Agent that can process queued cards, mentions, and feedback through specialist roles. Canvases are private by default, with email invitations or optional link sharing, and agents inherit the access of the user who authenticates them. Doop also provides design-memory features for exemplar frames, decisions, and proposed style rules, plus browser-based webpage synchronization that imports captured screens as editable HTML frames. It can be used as the hosted doop.design service or self-hosted with Bun, Docker, and embedded PGlite/Postgres; the source code is licensed under GNU AGPL v3.