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Color Accessibility Heatmap

Analyze UI screenshots for color accessibility issues. Generate visual heatmaps that highlight areas with poor contrast ratios and WCAG compliance problems.

Color Accessibility Heatmap

Upload UI screenshots to analyze color accessibility and generate contrast issue heatmaps

Upload Image

WCAG Level

Upload a UI screenshot to begin analysis

How It Works

The Color Accessibility Heatmap tool analyzes your uploaded screenshots pixel by pixel, checking contrast ratios between adjacent colors. It generates a visual overlay showing areas where contrast may not meet WCAG standards.

Analysis Process

Upload your UI screenshot or design mockup
Select WCAG compliance level (AA or AAA)
Tool analyzes adjacent pixel contrast ratios
Heatmap overlay highlights problem areas
Export heatmap for documentation or fixes

Heatmap Colors

Red areas: High contrast issues (very low ratios)
Orange areas: Moderate contrast issues
Clear areas: Good contrast, no issues detected

Best Practices

Image Quality

Use high-resolution screenshots for best results. Lower resolution images may miss fine details and text elements that need checking.

Multiple Views

Test different screen states (light mode, dark mode, hover states) to ensure accessibility across all user interactions.

Focus Areas

Pay special attention to text-over-image areas, form inputs, buttons, and interactive elements highlighted in the heatmap.

Iterative Testing

Use the heatmap to identify issues, make design adjustments, and re-upload to verify improvements.

Frequently Asked Questions

What image formats are supported?

The tool supports all common image formats including PNG, JPEG, GIF, and WebP. For best results, use PNG or high-quality JPEG screenshots.

How accurate is the analysis?

The tool samples pixels to analyze contrast ratios between adjacent colors. While it provides a good overview, manual testing of specific text elements is recommended for critical content.

Can I analyze multiple screenshots at once?

Currently, the tool analyzes one image at a time. Upload and analyze each screenshot separately, then export individual heatmaps for documentation.

What should I do with the heatmap results?

Use the heatmap to identify problem areas in your design. Adjust colors in highlighted regions to improve contrast, then re-upload to verify the fixes. Export heatmaps to share with your team or include in accessibility documentation.