• PASS
  • FAIL
  • DATA
  • HUMAN

How to check error state contrast with your AI

Connect this MCP to your AI client once. From there, you can instantly test color combinations for accessibility.

Ask AI about this page

Short answer

How can I check if my error text is readable?

Tell your AI to run a contrast check on your specific hex codes or UI elements. It will immediately tell you if your danger red text passes accessibility requirements against your chosen backgrounds.

The results.

What you get from these checks.

The AI handles the math and the standards, leaving you with clear results.

PASS

Valid color pairs

The AI confirms that your red text meets contrast ratios. You get the green light to use these colors in your UI.

FAIL

Accessibility warnings

The AI identifies where red text disappears into the background. It flags these specific combinations as non-compliant.

DATA

Contrast ratios

You receive the exact numerical ratios calculated by the tool. This helps you understand how close you are to the threshold.

HUMAN

Design decisions

The AI provides the data, but you decide which color adjustments look best. You choose the final palette based on the results.

The workflow

What your AI does when the request arrives.

The AI acts as a specialized auditor for your color choices.

  1. Analyze input

    Your AI takes the hex codes for your error text and your background colors.

    check_danger_text_contrast

  2. Calculate ratios

    The tool computes the luminance and contrast ratio between the red text and the background.

    check_danger_text_contrast

  3. Compare standards

    The AI checks the calculated ratio against accessibility guidelines to see if it passes.

    check_danger_text_contrast

  4. Report results

    The AI tells you exactly which combinations work and which ones fail.

    check_danger_text_contrast

Try it

Copy these to start.

Use these prompts to trigger the contrast check immediately.

Starting points

Swap the hex codes in these prompts with your actual design values.

WCAG Color Contrast Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_ToTQpdJuObTgdPgJyLWHlH7B6StfiSmankHl08eC/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — WCAG Color Contrast capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "color-contrast-checker-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_ToTQpdJuObTgdPgJyLWHlH7B6StfiSmankHl08eC/mcp"
    }
  }
}
Copy into chat04

  • Check the contrast of #FF0000 text on a #FFFFFF background.

  • Does this red error text (#D32F2F) pass contrast checks on a dark grey (#212121) background?

  • Run a contrast check for my error state colors: text #B00020 and background #F5F5F5.

  • Verify if my danger red text is readable on this specific background: #000000.

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect Color Contrast Checker once, then ask.

Click the link to connect the MCP to your client. Your login stays encrypted, and you can start checking colors right away.

Connect Color Contrast Checker to your AI

FAQ

How this task behaves.

  • 01

    Can the AI change my CSS files automatically?

    No. The AI only checks the colors you provide; it cannot modify your code or design files.

  • 02

    Does it check colors other than red?

    No. This specific tool is designed to verify danger red text specifically.

  • 03

    Will it suggest new hex codes for me?

    The AI can suggest alternatives if a check fails, but it only does this through your conversation.

  • 04

    Can I check multiple backgrounds at once?

    Yes, you can provide a list of different background hex codes in a single prompt.

  • 05

    Does the AI save my color palettes?

    No. The AI does not store your design data or color combinations after the session ends.

  • More questions about Color Contrast Checker? The Connector page answers them. See everything the Color Contrast Checker Connector can do

Connect WCAG Color Contrast to Claude, Cursor, ChatGPT & more