Color Blindness Simulator
Roughly 1 in 12 men sees color differently. TheWCAG's lens lets you view any app through the most common color-vision deficiencies - live, across your entire screen - so you can catch information that relies on color alone.
Simulated vision types
Deuteranopia
Reduced sensitivity to green - the most common form (~6% of men).
Protanopia
Reduced sensitivity to red; reds look darker and can blend with black.
Tritanopia
Rare blue–yellow deficiency; blues and greens become hard to tell apart.
Low acuity / blur
Simulates reduced sharpness to test whether layout survives without fine detail.
Why it matters (WCAG 1.4.1)
Success Criterion 1.4.1 “Use of Color” requires that color is never the only way to convey information - think error states, chart series, or required-field markers. Viewing your UI through a simulator is the fastest way to spot where color is doing work that a label, icon, or pattern should share. Pair it with the contrast checker for a complete color pass.
FAQ
- How many people are color blind?
- About 1 in 12 men (8%) and 1 in 200 women have some form of color vision deficiency - roughly 300 million people worldwide.
- Does the simulator work in any app?
- Yes. TheWCAG's lens is a live overlay, so it filters whatever is beneath it - your design tool, a website, a native app, or a video.
- Which types can I simulate?
- Deuteranopia, protanopia, tritanopia, and a low-acuity blur, each adjustable in strength from anomalous trichromacy up to full dichromacy.