Color Blindness Simulator

A Color Blindness Simulator transforms RGB colors to replicate how they are perceived by individuals with Color Vision Deficiency (CVD). It helps web designers audit buttons, text, icons, and data charts to ensure visual elements remain distinguishable for all users under WCAG accessibility guidelines.

Protanopia is red-blindness (inability to perceive red light), Deuteranopia is green-blindness (inability to perceive green light — the most common form), Tritanopia is blue-blindness (inability to perceive blue/yellow light), and Achromatopsia is monochromacy or total color blindness (seeing only shades of gray).

Approximately 8% of men and 0.5% of women worldwide experience some form of color vision deficiency. Testing your UI colors ensures your site remains accessible to millions of users.

Never rely solely on color to convey critical information (such as error messages or form field validations). Always pair colors with clear icons, text labels, border patterns, and high contrast ratios.

For users with Protanopia or Deuteranopia (red-green color blindness), pure red and pure green can look virtually identical (a muted yellowish-brown). Always include checkmark/cross icons or text status badges alongside color.

The simulator uses standardized Brettel-Viénot-Mollon transformation matrices, which accurately map 3D RGB color spaces into reduced dichromatic vision channels.

Yes! Each simulated vision card displays the exact converted HEX code so you can copy and test it in accessibility contrast checkers.

Yes, 100% free and privacy-first. All color transformations execute instantly in your browser without any server-side processing.