How to Simulate Color Blindness
Test your designs for color blindness. Simulate protanopia, deuteranopia, tritanopia, and more. Free accessibility testing tool.
Open Color Blindness Simulator →Step-by-Step Guide
Upload or select an image
Upload any image or design screenshot you want to test. You can also enter a URL to load an image from the web, or use the color picker to test specific colors.
Choose a vision type
Select from different types of color vision deficiency: Protanopia (red-blind), Deuteranopia (green-blind), Tritanopia (blue-blind), or Achromatopsia (complete color blindness). Each type shows how users with that condition perceive colors.
Compare side by side
View the original and simulated versions side by side. This helps you identify problematic color combinations that might be indistinguishable for color-blind users.
Adjust your design
Use the insights to improve your design. Add patterns, textures, or labels alongside colors. Test again until your design is accessible to all users.
Try It Now — Free
No signup, no download. Runs entirely in your browser.
Open Color Blindness Simulator