Color Blindness Simulator

Four. Protanopia (missing red cones) and deuteranopia (missing green cones) are the common red-green types. Tritanopia is the rare blue-yellow type. Achromatopsia is total color blindness, shown as grayscale.

It uses well-known linear color matrices that approximate each deficiency, the same approach used by browser accessibility tools. It is a useful approximation for design checks, not a medical diagnosis, and real color vision varies from person to person.

Both are red-green color blindness. Protanopia comes from missing or non-working red (L) cones, so reds look darker and dimmer. Deuteranopia comes from missing or non-working green (M) cones. The two look similar but shift colors slightly differently.

Around 1 in 12 men and 1 in 200 women have some color vision deficiency. If you rely on color alone to show status, charts, or links, those users may not tell the colors apart. Simulating helps you add contrast or labels where it matters.

No. The color math runs entirely in your browser with JavaScript, so the colors you enter never leave your device. There is nothing to upload and nothing is stored.

Yes. The API takes a HEX color and an optional type and returns the simulated HEX, or all four types when no type is given. The same engine powers both the page and the endpoint.