Why should meaning never rest on colour alone?

Red–green colour vision deficiency, where the two look alike, affects about 8% of men. Splitting success and failure by colour alone erases the information for them.

How is “hard to tell apart” decided?

The two colours are converted for each type and the distance between them measured; below a threshold it counts as hard. This is a design check, not a medical diagnosis.

So what should I do instead?

Pair colour with shape, an icon or a label. Widening the difference in lightness helps too.

Color vision simulator

Name: 색각 시뮬레이터
Author: KarmoLab

Protan · deutan · tritan · achromatopsia · distinguishability verdict

색각 시뮬레이터

두 색이 색각 이상에서 어떻게 보이는지 확인하고 구분 가능한지 판정합니다

색 1

색 2

일반

구분 가능 · 차이 175

적색맹 (1형)

구분 가능 · 차이 64

녹색맹 (2형) — 가장 흔함

구분 가능 · 차이 99

청색맹 (3형)

구분 가능 · 차이 148

전색맹

구분 어려움 · 차이 18

1개 유형에서 두 색이 거의 같아 보입니다 — 색만으로 뜻을 나누지 말고 모양·글자를 함께 쓰세요.

Simulates how two colors look under several kinds of color vision deficiency, and judges whether they stay distinguishable.

How to use it

Enter the two colours to compare
See them side by side for each type
Check the hard-to-tell-apart verdict

Common questions

Why should meaning never rest on colour alone?: Red–green colour vision deficiency, where the two look alike, affects about 8% of men. Splitting success and failure by colour alone erases the information for them.
How is “hard to tell apart” decided?: The two colours are converted for each type and the distance between them measured; below a threshold it counts as hard. This is a design check, not a medical diagnosis.
So what should I do instead?: Pair colour with shape, an icon or a label. Widening the difference in lightness helps too.

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