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Colour Blindness Simulator

Colour

See how an image looks to someone with colour vision deficiency — protanopia, deuteranopia, tritanopia and the milder anomalous types, side by side.

Runs in your browser•Zero cloud uploads / Files stay on device•No account required

Drop your file here, or browse files

or paste screenshot / image withCtrl + V
image/*
Which types
Coverage

Dichromacy means a cone type is missing entirely. Anomalous trichromacy means it is present but shifted — milder, and far more common: deuteranomaly alone accounts for most colour blindness. All of them are shown side by side, because the useful question is whether your design survives every one, not any single one.

Optimized For Platforms
designdeveloper

How it works

1Drop in a thumbnail, chart, screenshot or design.
2You get the three dichromatic types side by side with the original; switch on the anomalous types for the milder, more common forms.
3Look for anything that depended on a red/green difference — that is what disappears first.
4Download any simulation to share with whoever needs to see it.

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