Color Blindness Test
See how colors may appear with different types of color vision deficiency. Test any color instantly with this free online simulator.
Pick a color to testWhat is a color blindness test?
A color blindness test is a tool that helps illustrate how colors may appear under different forms of color vision deficiency. This simulator lets you compare a selected color across several simulated vision conditions, making it useful for accessibility checks, design reviews, and educational purposes.
How to use this color blindness test
Choose a color using the color picker or enter its HEX code. You can also select one of the quick test colors. The simulator immediately displays the selected color alongside several simulated versions, each with its corresponding HEX value.
The results are intended as a visual reference rather than a clinical assessment. Individual experiences of color vision deficiency can vary, so this tool should not be used to diagnose a vision condition.
Types of color vision deficiency simulated
The simulator includes several common color vision conditions and a grayscale reference:
- Normal vision: Shows the original color as a reference.
- Deuteranopia: Simulates a red-green color vision deficiency associated with reduced green perception.
- Protanopia: Simulates a red color vision deficiency.
- Tritanopia: Simulates a blue-yellow color vision deficiency.
- Achromatopsia: Shows the selected color as a grayscale value for comparison.
- Deuteranomaly: Simulates reduced green sensitivity.
Why color accessibility matters
Color is often used to communicate status, warnings, errors, categories, and other information in digital interfaces. Accessible design should not rely on color alone to communicate important information. The W3C Web Content Accessibility Guidelines recommend providing additional visual or textual cues when color differences carry meaning.
For more information, see the W3C Web Accessibility Initiative (WAI).
Frequently Asked Questions (FAQ)
No. This tool is a visual simulator for educational, design, and accessibility purposes. It is not a diagnostic test. If you are concerned about your color vision, a qualified eye care professional can provide an appropriate clinical evaluation.
The simulations use color transformation matrices to provide an approximation of how selected colors may change under different color vision conditions. They are useful for design and accessibility reviews, but they cannot reproduce every individual's visual experience.
Deuteranopia represents a more pronounced loss of green-sensitive cone function, while deuteranomaly represents reduced green sensitivity. The visual effects can vary between individuals.
Avoid using color as the only way to communicate information. Combine colors with text labels, icons, patterns, or other visual cues. Checking contrast and testing important interface states with accessibility tools can also help identify potential issues.
No. The color transformations are performed directly in your browser. The tool does not need an account or a server connection to process the color you enter.