How the simulator works
Each type of color blindness is modeled from how the eye's three cone types respond to light. The simulator converts every pixel into cone responses, removes or weakens the missing signal, and converts it back to color. The strength slider blends from a mild deficiency (anomalous trichromacy) to a complete one (dichromacy).
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Who it's for
Designers checking that charts, maps and interfaces work for color blind users. Parents, partners and teachers who want to understand what someone sees. And anyone who has just found out they're color blind and is curious how their view differs.