Doop
Multiplayer design canvas published under the AGPL v3 licence, positioned as the open-source alternative to Paper.design. Every design is a frame that renders real HTML in a sandboxed iframe. People edit in the browser, agents go through the built-in MCP server (Claude Code connects over OAuth), and everyone sees live cursors, per-frame editing status and an activity feed. Hosted version on doop.design, or self-host it with Docker Compose or Bun.
Strengths
- People and agents on the same canvas, with cursors and agent status visible live
- Built-in MCP server: Claude Code or another agent works in it with no bridge to build
- Frames are real HTML, so what you see is already close to code
Limitations
- AGPL v3 licence: if you modify Doop and offer it to others over a network, you must publish your changes
- No link to your Figma files: one more canvas to keep in sync next to your source of truth
- Young project from a small repo: prove it on a trial before a real project
Best for
- A workshop where designer, PM and agent explore screens together in real time
- A team that wants to see what human and agent collaboration on one canvas looks like