How to Use the Color Contrast Checker MCP in Claude

Q: How do I use the Color Contrast Checker in Claude Desktop?

Add the server configuration to your claudedesktopconfig.json file. Once you restart, the tools appear in your chat interface ready for your prompts.

Q: Does the Color Contrast Checker work with Claude Desktop dark mode?

Yes, you can use the checkdarkmodesurface tool to verify your text against standard dark UI backgrounds. It ensures your text remains readable in low-light environments.

Audit your interface accessibility directly within the Claude Desktop app using the Color Contrast Checker MCP server.

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Connect Color Contrast Checker MCP to Claude Desktop

Create your Vinkius account to connect Color Contrast Checker to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Color Contrast Checker with Claude Desktop

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Validate text readability in Claude Desktop

Stop guessing if your UI colors meet WCAG standards. You can use the `check_color_contrast` tool to get an exact ratio for any foreground and background pair. This MCP server gives you the hard data you need to fix accessibility issues before they hit production. Just provide the hex codes to your agent and it handles the math.

Test surface contrast in Claude Desktop

Check your component colors against standard UI surfaces without leaving your chat. The `check_dark_mode_surface` and `check_light_mode_surface` tools verify your text against common background defaults. This keeps your design system consistent across themes. Your agent flags any text that fails to meet compliance requirements immediately.

Rapid monochrome checks in Claude Desktop

Run quick audits for pure black or white text overlays using `check_black_text_on_bg` and `check_white_text_on_bg`. These tools isolate the most common high-contrast scenarios. Use these when you need to verify error messages or labels against custom backgrounds. It saves you from manual testing in design software.

Setup guide

Set up Color Contrast Checker MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Color Contrast Checker MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Color Contrast Checker MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under color-contrast-checker-mcp.

json

{
  "mcpServers": {
    "color-contrast-checker-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by WCAG Color Contrast. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Color Contrast Checker MCP in Claude Desktop

Add the server configuration to your claude_desktop_config.json file. Once you restart, the tools appear in your chat interface ready for your prompts.

Yes, you can use the `check_dark_mode_surface` tool to verify your text against standard dark UI backgrounds. It ensures your text remains readable in low-light environments.

Absolutely. You can request multiple checks in a single conversation thread to audit your entire color palette at once.

This server only processes the hex color codes you provide to calculate contrast ratios. It does not store, log, or transmit your actual design assets or proprietary UI files.

You risk shipping inaccessible interfaces that fail WCAG audits. Always run these checks during your development phase to stay compliant.

Use it with your favorite AI tools

Connect this server to Cursor, Claude, VS Code, and more.

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