See every color.
Design with confidence.
Preview an image with common color vision deficiency simulations. Everything runs locally, with an intensity control and a downloadable PNG.
Color blindness simulator
Showing a colorful built-in sample.
These are visual approximations based on color-transformation matrices, not a medical test. Use real user testing and contrast checks for accessibility decisions.
Protanopia
Spot colors that need a second cue
What does this simulator show?
It applies common color-transformation approximations for protanopia, deuteranopia, tritanopia, and achromatopsia. The result is a design preview, not a clinical measurement of how any person sees.
Does my image leave the browser?
No. The image is decoded into a local canvas. There is no upload endpoint or account, and the optional PNG download is created on your device.
How should I use the result?
Look for meaning that depends on color alone, then add labels, patterns, icons, or text. Pair this preview with a contrast checker and testing with people who have different visual needs.