Contrast Checker MCP

Name: Contrast Checker MCP
Author: ogSINGH

by ogSINGHversion 1.0.1i★ –iRuns on your computer

Registry nameio.github.ogSINGH/contrast-checker-mcp

Install

Overview

Description from the maker (original English)

MCP - WCAG 2.1 color contrast checker - contrast ratios, compliance and accessible color suggestions

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiVery new↓ 45/wk · ★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Law & government data

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

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

Run this in your terminal

claude mcp add contrast-checker -- npx -y contrast-checker-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "contrast-checker": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "contrast-checker-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 9, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account ogSINGH, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Law & government datai

More stars than 0% of the other 1758 servers in this category
Published to the registry more recently than 1% of the other 1758 servers in this category
Basic checks equal to or better than 100% of the other 1758 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Contrast Checker MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.1) reached the registry 9 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: OffshoreProz Agent Company, TracePass DPP Compliance Assistant, Private Law Wiki

Alternatives

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Private Law Wiki

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

contrast-checker-mcp

An MCP server that provides color contrast checking tools for AI assistants. Verify WCAG 2.1 accessibility compliance, compute contrast ratios with alpha transparency support, and get accessible color suggestions — all via the standard Model Context Protocol.

Contrast calculations match WebAIM's contrast checker — including alpha compositing, WCAG 0.03928 sRGB threshold, and truncated (not rounded) ratios.

Tools

`check_contrast`

Check the contrast ratio between two colors and evaluate WCAG 2.1 compliance.

Inputs:

foreground — Foreground color (e.g. #333, rgb(0,0,0), rgba(0,0,0,0.5), navy)
background — Background color (e.g. #fff, rgb(255,255,255), white)

Output: Contrast ratio, WCAG 2.1 pass/fail results (AA normal, AA large, AAA normal, AAA large), parsed color values. When the foreground has alpha, shows the effective composited color used for the calculation.

`suggest_accessible_color`

Suggest a replacement color that meets a WCAG contrast target, keeping the hue as close to the original as possible.

Inputs:

foreground — Foreground color
background — Background color
target_level — "AA" or "AAA" (default: "AA")
fix — "foreground" or "background" (default: "foreground")

Output: A suggested replacement color (in hex, rgb, hsl) that meets the target level, along with the new contrast ratio.

`parse_color`

Parse a color string and return it in multiple formats.

Inputs:

color — Color to parse (e.g. #ff6600, rgb(255,102,0), tomato)

Output: The color in hex, rgb, and hsl formats.

Supported Color Formats

Hex: #rgb, #rrggbb, #rgba, #rrggbbaa
RGB: rgb(r, g, b), rgba(r, g, b, a)
HSL: hsl(h, s%, l%), hsla(h, s%, l%, a)
CSS named colors: red, cornflowerblue, rebeccapurple, etc.

Setup

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

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

Claude Code

claude mcp add contrast-checker npx -y contrast-checker-mcp

Cursor / VS Code

Add to .cursor/mcp.json or .vscode/mcp.json:

"servers": { "contrast-checker": { "command": "npx", "args": ["-y", "contrast-checker-mcp"] } } }

From source

git clone https://github.com/ogSINGH/contrast-checker-mcp.git

cd contrast-checker-mcp npm install npm run build node dist/index.js

Examples

Black on white — 21:1 ratio, all WCAG levels pass:

check_contrast({ foreground: "#000000", background: "#ffffff" })

Semi-transparent text — alpha composited onto background before checking:

check_contrast({ foreground: "rgba(0,0,0,0.5)", background: "#ffffff" })

→ effective color #808080, ratio 3.94:1

Fix a failing color pair:

suggest_accessible_color({

foreground: "#777777", background: "#ffffff", target_level: "AA" }) → suggests #757575 (4.61:1)

License

Apache-2.0

Contrast Checker MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Law & government datai

Common questions

Alternatives

OffshoreProz Agent Company

TracePass DPP Compliance Assistant

Private Law Wiki

README from the maker

contrast-checker-mcp

Tools

check_contrast

suggest_accessible_color

parse_color

Supported Color Formats

Setup

Claude Desktop

Claude Code

Cursor / VS Code

From source

Examples

License

`check_contrast`

`suggest_accessible_color`

`parse_color`