Tritanopia Simulator

Tritanopia is a rare form of color blindness where the blue-sensitive cone cells (S-cones) are missing or non-functional. It affects fewer than 1 in 10,000 people and causes difficulty distinguishing between blue and yellow hues. Blues may appear greenish, yellows can look pink or gray, and the entire color spectrum shifts toward reds and cyans.

Since blue is the most common link color on the web, tritanopic users may have difficulty identifying links — especially if they're not underlined. Blue buttons can blend with surrounding elements. Yellow highlights and warning banners become hard to distinguish. Always underline links and use borders or icons alongside color for important UI elements.

While tritanopia is rare, testing for it demonstrates commitment to inclusive design. More importantly, designs that work for tritanopic users tend to work better for everyone — the practice of not relying solely on blue-yellow distinctions leads to clearer, more robust UIs. It's a quick check that adds significant value.

Red and green tones are generally perceived normally by tritanopic users — making red-green palettes (which fail for deuteranopia/protanopia) actually work well here! However, the safest approach is a high-contrast grayscale base supplemented with red and teal accents, avoiding blue-yellow color coding entirely.