Color Tools

title: "Color Contrast Tools — Stark, Checker, and CCA" weight: 17 description: "Learn the most popular color contrast checking tools: Stark for design workflows, Colour Contrast Analyser for desktop testing, and WebAIM's contrast checker for quick online verification." date: 2026-06-28 lastmod: 2026-06-28 tags: [accessibility, color-contrast]

Color contrast tools range from design plugins like Stark (Figma, Sketch) and desktop apps like Colour Contrast Analyser to online checkers like WebAIM's -- each suited for different stages of the design-to-development workflow.

## What You'll Learn

You will use Stark for design-time contrast checking, Colour Contrast Analyser for precise desktop measurement, and WebAIM's checker for quick verification.

## Why It Matters

Choosing the right tool for the right stage saves time and catches contrast issues earlier. Design tools catch issues before development. Desktop tools provide precise measurements for QA. Online tools are great for quick checks.

## Real-World Use

A designer uses Stark in Figma to check contrast while designing. Every color choice is validated against WCAG thresholds before reaching developers. During QA, the tester uses Colour Contrast Analyser to verify the implemented colors match the design.

## Tool Selection Flow

```mermaid
flowchart TD
  A[Need contrast check] --> B{What stage?}
  B -->|Design| C[Stark]
  B -->|Development| D[CCA / WebAIM]
  B -->|Automated| E[axe-core / Lighthouse]
  C --> F[Check in design tool]
  D --> G[Verify implemented colors]
  E --> H[Scan for violations]

Using Contrast Tools

Each tool has specific strengths. Use them in combination for complete coverage.

<!-- WebAIM contrast checker: paste hex values -->
<!-- Input: #333 on #fff -->
<!-- Output: Ratio 12.6:1, Passes AA, Passes AAA -->

/* Stark: check in Figma before writing code */
.button-primary {
  background: #0056b3; /* Stark validates against WCAG */
  color: #ffffff;
}

/* Colour Contrast Analyser: verify implemented colors */
.secondary-text {
  color: #666666;
  /* CCA: 4.6:1 against white -- passes AA */
}

// Programmatic contrast checking with axe-core
const AxeBuilder = require('@axe-core/cli');

async function checkColorContrast(url) {
  const results = await AxeBuilder.analyze({
    url,
    rules: ['color-contrast']
  });

  const contrastViolations = results.violations.filter(
    v => v.id === 'color-contrast'
  );

  contrastViolations.forEach(v => {
    console.log(`Element: ${v.nodes[0].target}`);
    console.log(`Issue: ${v.description}`);
  });
}

Common Mistakes

• Using online tools for dynamic colors that change on interaction
• Not checking contrast on the actual implemented colors
• Relying on one tool for all contrast checking needs
• Forgetting to check hover and focus states in design tools
• Using the wrong background color in the tool
• Not calibrating the monitor before visual assessment
• Ignoring alpha transparency in color values

Practice and Challenge

Practice 1: Install Stark and check a color pair in a design file. Practice 2: Use Colour Contrast Analyser to check a live website. Practice 3: Use WebAIM's contrast checker for three color pairs. Practice 4: Compare results between Stark and CCA for the same colors. Practice 5: Run axe-core and find contrast violations on a page.

Challenge: Create a contrast testing workflow document for your team. Specify which tool to use at each stage: design (Stark), development (CCA), QA (axe-core), and monitoring (Lighthouse CI). Include setup instructions and pass/fail criteria for each tool.

FAQ

Mini Project

Create a contrast tool comparison guide. Test the same 10 color pairs across Stark, CCA, WebAIM, axe-core, and Chrome DevTools. Document any differences in results, the workflow integration for each tool, and recommend which tool to use at each stage of development.

What's Next

Color Blindness covers types of color blindness and how to design for them.