ContrastKit MCP Server

by workers-mike-tusa-contrastkit Your server? Claim it

answering

ContrastKit is answering right now. Last checked 11 min ago. It exposes 4 tools.

WCAG color contrast checks, nearest accessible color, CSS color conversion and palette pair checks.

Uptime history 68 hours of history

68 hours agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

187 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check ContrastKit 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 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add contrastkit --transport http https://contrastkit.mike-tusa.workers.dev/mcp

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

https://contrastkit.mike-tusa.workers.dev/mcp

~/.codex/config.toml

[mcp_servers.contrastkit]
url = "https://contrastkit.mike-tusa.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "contrastkit": {
      "url": "https://contrastkit.mike-tusa.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "contrastkit": {
      "type": "http",
      "url": "https://contrastkit.mike-tusa.workers.dev/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.

contrast

check_contrast

Compute the WCAG 2.x contrast ratio between a text (foreground) color and a background color, with pass/fail for AA, AA large text, AAA, AAA large text and non-text UI (3:1). Handles translucent colors. Read-only. Same engine as GET /api/contrast.

convert

convert_color

Convert a CSS color to hex, rgb() and hsl(), with its relative luminance, its contrast on white and on black, and the better text color (black or white) to put on it. Read-only. Same engine as GET /api/convert.

palette

check_palette

Contrast ratio for every pair of 2 to 12 colors (up to 66 pairs), highest first, each flagged against the chosen WCAG level. Use it to see which brand colors can be used together for text. Read-only. Same engine as GET /api/palette.

suggest

suggest_accessible_color

For a failing color pair, find the closest color (same hue and saturation, lightness changed as little as possible) that meets the chosen WCAG level. Adjust the foreground (default), the background, or both (best first). Read-only. Same engine as GET /api/suggest.

Endpoints

URL	Transport	State	Latency	Checked
https://contrastkit.mike-tusa.workers.dev/mcp	streamable-http	answering	1499 ms	11 min ago

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Uwarp

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PaletteGet

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ContrastKit — questions

Answers built from our own checks of this server.

What can ContrastKit do?

It exposes 4 tools, read directly from the server on our last check. Among them: check_contrast, check_palette, convert_color, suggest_accessible_color. 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 ContrastKit 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 187 ms. The bar chart above shows every period we have measured.

How do I connect ContrastKit?

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 ContrastKit need an API key?

No. ContrastKit 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 ContrastKit?

It answers our handshake in 187 ms on average, which is faster than 80% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.