🔵 Tritanopia Simulator
See how an image or palette looks with tritanopia, a rare blue-yellow 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 tritanopia simulator works
Each pixel or swatch is linearised and multiplied by the published Machado (2009) tritanopia matrix, then converted back to sRGB, with a severity slider for milder tritanomaly. Everything runs on a canvas in your browser.
Tritanopia (blue-weak) is rare but affects blues and yellows — the colors many UIs use for links and highlights — so blue/teal or yellow/pink distinctions are the ones to verify.
Frequently asked questions
What is tritanopia?
Tritanopia is a blue-yellow color-vision deficiency where the blue-sensitive (S) cones are absent. Blues and greens, and yellows and pinks, become hard to distinguish. It is much rarer than the red-green types and affects men and women about equally.
What should I check for?
Blue links versus teal, and yellow versus pink or light-green cues. If these collapse, add text or shape cues or widen the lightness gap.
How common is tritanopia?
Very rare — well under 1% of people — but simulating it still catches blue/yellow ambiguities that affect more common conditions and low-light viewing.
Is my image uploaded?
No — it is processed on a canvas in your browser and never sent anywhere.
Can I simulate partial blue-weakness?
Yes — the severity slider approximates tritanomaly by interpolating toward full tritanopia.