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Colour Blindness Simulator

See how a colour appears to people with protanopia, deuteranopia and tritanopia.

To simulate colour blindness, pick a colour and see how it appears under protanopia, deuteranopia, tritanopia and achromatopsia. This matters most for red-green pairs used to signal success and error, which can become indistinguishable to around 8% of men.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Which colour pairs should I avoid?

Red and green are the classic problem, since red-green deficiency is by far the most common. Also avoid green/brown, blue/purple and light green/yellow. Add an icon or label rather than relying on hue.

How to use the colour blindness simulator

  1. 1Pick the colour.
  2. 2Choose the simulate.
  3. 3The result appears immediately — copy or download it.

Embed this tool

Put the working colour blindness simulator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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