Designing for Color Blindness: A Practical Checklist

The three common types

Deuteranopia - green-weak (most common, ~6% of men).

Protanopia - red-weak.

Tritanopia - blue-weak (rare).

Five rules

Never rely on color alone. Use icons, text labels, and patterns alongside color.

Test contrast. 4.5:1 for body text, 3:1 for large text and graphics.

Avoid red/green pairings for critical info like errors and success states.

Use lightness, not just hue, to differentiate categories in charts.

Simulate your designs with our Colorblind Simulator before shipping.

Inclusive color design is not a constraint - it is a forcing function for clarity.