colorblind-mcp

colorblind-mcp

An MCP server that lets an LLM see a color or an image the way a colorblind person does — it recolors PNG/JPEG for protanopia, deuteranopia, and tritanopia, and hands the recolored image back. The showing counterpart to cvdsafe-mcp, which judges whether colors are safe. Built on opticquiz-cvd (Machado, Oliveira & Fernandes 2009). Runs locally over stdio; nothing leaves your machine.

Tools

• simulateColor — { color, type, severity? } → how one hex color appears under a deficiency.
• compareVision — { color, severity? } → that color under protan, deutan, and tritan at once.
• simulateImage — { path?, dataUri?, type?, severity? } → the image recolored the way the chosen deficiency renders it, returned as an image. Reads PNG and JPEG.

Add it to Claude Desktop

Edit claude_desktop_config.json (Settings → Developer → Edit Config) and add:

{
  "mcpServers": {
    "colorblind": {
      "command": "npx",
      "args": ["-y", "colorblind-mcp"]
    }
  }
}

Restart Claude Desktop. Then ask, e.g., "Show me ./dashboard.png the way a deuteranope sees it," or "What does #d7191c look like to someone with each kind of colorblindness?" — and it calls the tools. Same config shape works in Cursor and other MCP clients.

Note

A simulation for design and communication, not a clinical diagnosis, and no on-screen rendering is exact for a given individual. Method: Machado, Oliveira & Fernandes (2009) — https://doi.org/10.5281/zenodo.21310578