Chart Color System MCP Server

by socraticstatic Your server? Claim it

not responding

Chart Color System is listed as active in the registry but did not answer our last check. It exposes 4 tools. Last commit 4 Oct 2026.

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

Uptime history 53 days of history · worst day 23%

53 days agonow

53.8%

Uptime 24h

49 of 91 checks

Tools

read from the server

259 ms

Response time

average over 24h

Stars

last commit 4 Oct 2026

Chart Color System does not always answer

Over the last week it answered 57.3% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 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

Settings → Connectors → Add custom connector, then paste this address

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

{
  "servers": {
    "chart-color-system": {
      "type": "http",
      "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	97 ms	14 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 49 of 91 checks got a reply (53.8%), average response time 259 ms. The bar chart above shows every period we have measured.

The registry lists Chart Color System as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

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 in the form 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 259 ms on average, which is faster than 53% 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.