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Color Blindness Simulator

Check that your colours still work for people who see them differently.

  • Free
  • No sign-up
  • Files stay on your device
Normal vision
Protanopia (no red cones)
Deuteranopia (no green cones)
Tritanopia (no blue cones)
Achromatopsia (no colour)

If two swatches in a row look alike, people with that type of colour vision can't tell those colours apart — add labels, patterns or stronger lightness contrast.

or drag and drop it here

Processed on your device.

Your files are processed entirely in your browser using built-in web technologies. They are not uploaded to our servers, and closing the page clears them from memory.

How to use the Color Blindness Simulator

  1. Enter your palette's hex colours to compare swatches.
  2. Upload an image, chart or screenshot.
  3. Switch between types and compare with normal vision.

What does this tool do?

About 1 in 12 men and 1 in 200 women have some form of colour vision deficiency, most often red–green. The simulation uses the Machado (2009) model applied in linear RGB. If two colours look alike in a simulation, add labels, patterns or stronger lightness differences.

Images are processed on your device.

Why use it?

  • Four types of CVD.
  • Palette and image checks.
  • Scientific model.

Privacy

Your files are processed entirely in your browser using built-in web technologies. They are not uploaded to our servers, and closing the page clears them from memory. There's no account to create and nothing to install.

Last reviewed by the M2Toolkit team.

Other tools people use alongside the color blindness simulator.