Prototyper is a browser workspace where a visual editing surface and a live React codebase are treated as one artifact: a change on either side appears on the other, and the result runs as a real app rather than a clickable picture. Designers, engineers, product managers, and founders use it to compare several directions at once, with repositories, files, and design tokens sitting next to the work.
Rather than hand off static screens or lock customers to one model, Prototyper connects to the coding agent a customer already uses (Claude Code, Codex, or another MCP client) through its own MCP endpoint, and lets several people and agents edit the same files at once. Work that already lives in GitHub, Google Drive, Linear, Notion, or Figma can be mounted beside the design, so the people and agents building a product share one set of files instead of exporting screens between tools.
