Color Blindness Simulator
Preview how colors appear to people with different types of color vision deficiency.
Original Color
Color Blindness Types
Test Color Palette
Add multiple colors to see how they appear together for different vision types.
What Is Color Blindness?
Color blindness (color vision deficiency) is a condition where a person cannot distinguish certain colors or perceives them differently than most people. It affects approximately 8% of men and 0.5% of women worldwide — roughly 300 million people globally. Most color blindness is genetic, caused by absent or altered photopigments in the cone cells of the retina.
Types of Color Blindness
- Protanopia: Complete absence of red cone cells. Red appears dark, and red-green distinctions are lost. Affects ~1% of males.
- Deuteranopia: Complete absence of green cone cells. The most common form of color blindness, affecting ~6% of males. Green-red confusion is the primary symptom.
- Tritanopia: Absence of blue cone cells. Extremely rare (~0.01% of the population). Blue-yellow confusion is the primary symptom.
- Achromatopsia: Complete color blindness — only shades of gray are perceived. Very rare (~1 in 30,000 people).
Why Simulate Color Blindness?
Designers and developers must ensure their interfaces are usable by everyone, including people with color vision deficiencies. This simulator helps you:
- Test UI designs: Verify that buttons, alerts, charts, and status indicators are distinguishable without relying solely on color.
- Meet WCAG accessibility standards: WCAG 2.1 guideline 1.4.1 states that color should not be the only visual means of conveying information.
- Validate data visualizations: Ensure charts, maps, and graphs are readable by color-blind users by testing your color palette.
- Improve user experience: Making your design accessible to 8% more users directly improves engagement and usability metrics.
Design Tips for Color Accessibility
| Tip | Example |
|---|---|
| Never rely on color alone | Use icons, labels, or patterns alongside color (e.g., ✓ green checkmark, ✗ red X) |
| Ensure sufficient contrast | Maintain at least 4.5:1 contrast ratio for text (WCAG AA) |
| Use color-blind-safe palettes | Tools like ColorBrewer provide palettes designed for color vision deficiencies |
| Avoid red-green combinations | Use blue-orange or blue-red instead for status indicators |
| Add texture to charts | Use stripes, dots, or cross-hatching in addition to different colors |
How to Use This Tool
- Enter a HEX color code or use the color picker.
- View how the color appears under different types of color vision deficiency.
- Compare the original color with simulated versions side by side.
- Use the results to ensure your designs are accessible to all users.
Why Use This Tool?
- Test your designs for color accessibility compliance.
- Covers all major types: Protanopia, Deuteranopia, Tritanopia, and more.
- Essential for meeting WCAG accessibility guidelines.
- Runs entirely in your browser — no uploads required.
Frequently Asked Questions
How accurate is this simulator?
This tool uses established color science algorithms to approximate how colors appear to people with different types of color vision deficiency. While no simulation is perfect (individual experiences vary), it provides a reliable representation for design testing purposes.
Can color blindness be cured?
Currently, there is no cure for inherited color blindness. However, special corrective lenses (like EnChroma glasses) can enhance color perception for some types, and gene therapy research is ongoing.