Free Tritanomaly
Test Online
Tritanomaly is partial blue-yellow color weakness—less severe than tritanopia. Screen with our free 18-plate test in under 2 minutes.
Free Online Color Blindness Test
Take our free Ishihara color blind test to check for red-green color blindness, deuteranopia, protanopia, and tritanopia. Get instant results with our scientifically-designed 18-plate color vision screening test. No registration required.
- Disable dark mode and blue-light filters (Night Shift, f.lux)
- Set screen brightness to at least 80%
- Ensure you are in a neutral lighting environment
- View screen from a normal reading distance
What Is Tritanomaly?
Tritanomaly is a form of blue-yellow color vision deficiency where short-wavelength (S) cones exist but do not function normally. Colors along the blue-yellow axis are shifted rather than fully absent—as in complete tritanopia.
Tritanomaly vs Tritanopia
Tritanomaly vs tritanopia: tritanopia is dichromatic (no working S-cone channel); tritanomaly is anomalous trichromacy (weakened S-cones). Many people search for a tritanomaly test or mild tritanomaly screening—this 18-plate test flags blue-yellow patterns alongside red-green plates.
Design & Simulation
Preview UI under partial blue-yellow loss with our color blind simulator and adjust severity on the slider.