🟢 Deuteranopia Simulator
See how an image or palette looks with deuteranopia, the most common red-green color-vision deficiency — processed entirely on your device.
Choose an image to see the original and simulated versions side by side. It never leaves your device.
Machado, Oliveira & Fernandes (2009) matrices in linear-sRGB. Approximates average CVD perception. 🔒 Images processed on-device, never uploaded.
How the deuteranopia simulator works
Each pixel or swatch is linearised and multiplied by the published Machado (2009) deuteranopia matrix, then converted back to sRGB; a severity slider interpolates toward milder deuteranomaly. Images run on a canvas and are never uploaded.
Deuteranopia (green-weak) is the most common form of color blindness — roughly 6% of men — so it is the first thing to test when red and green carry meaning in a UI or chart.
Frequently asked questions
What is deuteranopia?
Deuteranopia is a red-green color-vision deficiency where the green-sensitive (M) cones are absent, making reds, greens, browns and oranges hard to tell apart. It is the most common type of color blindness.
How common is it?
Deuteranomaly and deuteranopia together affect roughly 6% of men (and far fewer women), making green-weakness the single most prevalent color-vision deficiency.
What should I check for?
That red/green status colors, chart series and success/error states remain distinguishable. If two collapse to the same look, add text, icons or a lightness difference.
Is the image uploaded?
No — it is processed in your browser on a canvas and never sent anywhere.
Can I simulate milder green-weakness?
Yes — the severity slider interpolates between your original and full deuteranopia to approximate deuteranomaly (partial green-weakness).