What is the most common type of colour blindness?

Deuteranopia/deuteranomaly (green-weak/absent) affects ~6% of males. Protanopia/protanomaly (red-weak/absent) affects ~2%. Together they account for ~8% of males and ~0.5% of females worldwide.

Does this accurately simulate colour blindness?

The tool uses the Brettel and Machado colour transformation matrices, which are the standard scientific model used by accessibility tools like Coblis. They produce accurate simulations for dichromatic (2-receptor) types.

Color Blindness Simulator

Simulates how uploaded images appear to people with various types of colour vision deficiency: Protanopia (red-blind), Deuteranopia (green-blind), Tritanopia (blue-blind), Protanomaly/Deuteranomaly/Tritanomaly (partial deficiencies), and Achromatopsia (monochromacy). Uses scientifically validated colour transformation matrices applied via a canvas element. Useful for designing accessible UIs.