Color Blindness Simulator
Simulate color blindness
Color Blindness Simulation
About This Tool
The Color Blindness Simulator shows how colors appear to people with different types of color vision deficiency. About 8% of men and 0.5% of women have some form of color blindness.
Upload an image or enter colors to see how they look with protanopia, deuteranopia, tritanopia, and other conditions. Essential for accessible design.
How It Works
How to Use This Simulator
Using our color blindness simulator is easy:
- Upload an image - Drag and drop or select any image file.
- Or enter colors - Input HEX, RGB, or HSL values to test specific colors.
- Select vision type - Choose from protanopia, deuteranopia, tritanopia, or other conditions.
- Compare results - View side-by-side comparisons of normal vision vs. simulated vision.
Formula
Types of Color Blindness
Red-Green Color Blindness (most common): Protanopia (no red cones, 1% of males), Deuteranopia (no green cones, 1% of males), Protanomaly (weak red cones, 1% of males), Deuteranomaly (weak green cones, 5% of males).
Blue-Yellow Color Blindness (rare): Tritanopia (no blue cones), Tritanomaly (weak blue cones).
Complete Color Blindness (very rare): Achromatopsia (no color vision).
Examples
Examples
Example 1: Red-Green Confusion
- Normal: Red (#FF0000) vs Green (#00FF00)
- Deuteranopia: Both appear yellowish-brown
- Impact: Traffic lights, status indicators
Example 2: Blue-Yellow Issues
- Normal: Blue (#0000FF) vs Yellow (#FFFF00)
- Tritanopia: Blue appears greenish, yellow appears pinkish
- Impact: Charts, data visualization
Example 3: Accessible Design
- Problem: Red error text on green background
- Solution: Add icons, patterns, or high contrast
Frequently Asked Questions
How does the Color Blindness Simulator work?
The simulator applies color transformation matrices that replicate how people with different types of color vision deficiency perceive colors. Upload an image or enter a color to see how it appears under protanopia, deuteranopia, and tritanopia.
What are the main types of color blindness?
Protanopia: reduced red sensitivity (1% of males). Deuteranopia: reduced green sensitivity (5% of males, most common). Tritanopia: reduced blue sensitivity (rare, <1%). Achromatopsia: complete color blindness (extremely rare).
How do I design for color blind users?
Use high contrast between elements. Do not rely on color alone to convey information — add patterns, labels, or icons. Avoid red-green combinations. Test designs with a simulator. Approximately 8% of men and 0.5% of women have some form of color vision deficiency.
What color combinations are safe for color blind users?
Safe pairs: blue and orange, blue and yellow, dark blue and white, black and yellow. Avoid: red and green, green and brown, blue and purple, light green and yellow. The simulator helps verify your specific color choices.
Does WCAG require color blindness accessibility?
WCAG 2.1 guideline 1.4.1 states color must not be the only visual means of conveying information. Guideline 1.4.3 requires minimum contrast ratios: 4.5:1 for normal text, 3:1 for large text. The simulator helps verify compliance.
Disclaimer
Disclaimer: This simulator uses scientifically-based algorithms to approximate how colors appear to people with color vision deficiency. Individual experiences may vary. This tool is intended for design and educational purposes and should not be used as a medical diagnostic tool. All processing happens in your browser; no images are uploaded to any server.
💡 Tips
Tips
- Don't rely on color alone to convey information
- Use patterns, icons, or text labels alongside colors
- Ensure sufficient contrast (WCAG recommends 4.5:1)
- Test your designs with multiple color blindness types
- Consider using colorblind-friendly palettes