Prototyper
Infinite canvas where sketches are running React and your own coding agent works beside you
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prototyper.coAbout Prototyper
Prototyper is an infinite canvas where the design and the running code are the same artifact. You draw an interface on the canvas and it becomes real, executing React; move a shape and the code updates, edit the code and the shape follows. The company's framing is that the prototype is the product — try ten variants, keep the one, and ship it rather than rebuilding it in a second tool. The second half of the pitch is agents. Rather than shipping its own captive coding model, Prototyper lets you bring the agent you already pay for: Claude Code, Codex, Cursor or GitHub Copilot connect by pasting a single install line, after which the agent reads your files, writes real React and opens pull requests while the result renders beside you on the canvas. Humans get cursors and agents get ghosts, so you can watch three agents work in parallel — one on the UI, one on tests, one on copy — and see status as the work itself rather than as a standup. The workspace mounts the stack you already use: GitHub, Google Drive, Linear, Notion, Figma, your CI and arbitrary MCP servers are all readable from the canvas the way they exist on your machine. Version 1.0 shipped with multiplayer, live preview, and per-file version history.
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Key Features
Prototyper Pros & Cons
✅ Pros
- +Bring-your-own-agent works on the free tier, so an existing Claude Code seat carries over
- +Design-code round-tripping removes the usual handoff rebuild
- +MCP mounts mean your existing stack is readable without bespoke integration
⚠️ Cons
- −Bundled AI credits with metered overage make cost harder to forecast
- −React-first — other frameworks are not part of the pitch
- −Free tier's 5 messages and 100 MCP calls per week are quickly exhausted
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