Chart Color System MCP Server

by socraticstatic Your server? Claim it

answering

Chart Color System is answering right now. Last checked 10 min ago. It exposes 4 tools. Last commit 16 Sep 2026.

Solve, audit and simulate colorblind-safe chart palettes. WCAG contrast, OKLab ΔE. Read-only.

Uptime history 7 days of history

7 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

359 ms

Response time

average over 24h

Stars

last commit 16 Sep 2026

Nothing serious here today

Today is the operative word: we check Chart Color System every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add chart-color-system --transport http https://chart-color-mcp.vercel.app/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "chart-color-system": {
      "url": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.chart-color-system]
url = "https://chart-color-mcp.vercel.app/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "chart-color-system": {
      "url": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "chart-color-system": {
      "url": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

audit

audit_palette

Audit existing chart colors for accessibility: pairwise OKLab separation under normal vision, deuteranopia, protanopia, tritanopia and achromatopsia, plus WCAG 2.2 non-text contrast (3:1) of every color against the chart background. Returns a pass / warn / fail verdict with the numbers behind it. Set ramp=true for sequential or diverging scales, whose steps are meant to be close.

build

build_ramp

Build an evenly spaced perceptual (OKLab) color scale: sequential from start to end, or diverging from start through mid to end. Returns the steps and a background-contrast audit (pairwise separation is not judged for ramps).

simulate

simulate_palette

Show what each color looks like to readers with deuteranopia, protanopia, tritanopia or achromatopsia (published Machado 2009 matrices), so an assistant can describe or render the palette as a colorblind reader sees it.

solve

solve_palette

Generate a categorical chart palette of n colors (1-12) that maximizes perceptual separation under normal vision and colorblindness, with the given brand colors locked as anchors in slot order. Returns the palette, the worst pair distances, the engine's relaxation notes, a full accessibility audit against the background, and a link to open it in the app. Honest cap is 6 slots; above that the result says so.

Endpoints

URL	Transport	State	Latency	Checked
https://chart-color-mcp.vercel.app/mcp	streamable-http	answering	229 ms	10 min ago

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Chart Color System — questions

Answers built from our own checks of this server.

What can Chart Color System do?

It exposes 4 tools, read directly from the server on our last check. Among them: audit_palette, build_ramp, simulate_palette, solve_palette. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Chart Color System working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 359 ms. The bar chart above shows every period we have measured.

How do I connect Chart Color System?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Chart Color System need an API key?

No. Chart Color System completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Chart Color System?

It answers our handshake in 359 ms on average, which is faster than 46% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Chart Color System open source?

We cannot say either way: written in TypeScript and 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.