• PASS
  • FAIL
  • CRITICAL
  • HUMAN

How to validate dark mode readability with your AI

Connect the Color Contrast Checker to your AI client. Your agent then handles the math for contrast ratios across different dark themes.

Ask AI about this page

Short answer

How do I check if my dark mode text is readable?

Your AI tests text contrast against dark surfaces and pure black backgrounds. You'll get a clear list of which color combinations pass or fail accessibility standards.

The results.

Where your contrast issues land.

The AI categorizes every color mismatch it finds.

PASS

Legible colors

The AI confirms the contrast ratio meets your requirements. You get a list of safe color combinations for your dark theme.

FAIL

Low contrast warnings

The AI identifies text that is too dim against dark backgrounds. You'll see exactly which hex codes are causing the legibility issues.

CRITICAL

Pure black failures

The AI flags text that disappears against #000000. This highlights elements that are invisible to users in high-contrast dark modes.

HUMAN

Design decisions

The AI flags ambiguous results that need your eye. You decide if a color needs a slight tweak or a total replacement.

The workflow

What your AI does when the request arrives.

Your agent acts as a specialized auditor for your UI colors.

  1. Surface analysis

    The AI looks at the specific dark background you're using to establish a baseline for contrast.

    check_dark_mode_surface

  2. Black background test

    The agent checks how your text performs against a pure black hex code to find extreme legibility failures.

    check_text_on_pure_black

  3. Ratio calculation

    The AI calculates the mathematical contrast ratio between your text and the surface colors.

    check_dark_mode_surface

  4. Issue reporting

    The agent compiles the results into a readable list of passing and failing color pairs.

    check_text_on_pure_black

Try it

Copy these to start.

Use these prompts to kick off the validation process.

Starting points

Swap the bracketed text for your actual hex codes or design file references.

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 #FFFFFF text against my dark mode surface #121212.

  • Run a readability check for my primary button color on a pure black background.

  • Validate all text colors in my Figma design file against this dark theme surface.

  • Tell me if my secondary text color passes contrast checks on #050505.

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

Start here

Connect Color Contrast Checker once, then ask.

Just one connection gives your AI access to these tools. Your credentials stay encrypted and secure.

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 and reports the results. You have to apply the actual code changes yourself.

  • 02

    Does it check accessibility for mobile specifically?

    It checks the mathematical contrast ratios, which apply to both mobile and desktop. It doesn't simulate specific mobile screen brightness levels.

  • 03

    Can it check colors against light mode too?

    No. This specific connector is built only for dark mode surfaces and pure black backgrounds.

  • 04

    Will it delete any of my design files?

    No. The AI only reads color data to perform the checks. It has no capability to modify or delete your files.

  • 05

    How does it know which colors to check?

    It only checks the specific hex codes or surfaces you provide in your prompt.

  • 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