Designing for Color Blind Users: 5 Essential Tips to Boost Accessibility

Globally, about 1 in 12 men and 1 in 200 women experience color vision deficiency (CVD), meaning at least 8 out of every 100 web or app users may have a markedly different experience than expected. This article outlines methods to ensure designs remain attractive and usable for these users.

What is color blindness?

Most people with CVD can see clearly; the difference lies in their inability to distinguish red, green, or blue spectra, caused by an X‑chromosome mutation (making women more likely carriers). The three main types are:

Red‑green blindness : confusion of any colors containing red or green. Red‑blind : insensitivity to red light. Green‑blind : insensitivity to green light; for example, a red‑blind person may confuse blue and purple because they cannot detect the red component in purple. Blue‑blind : the rarest form, unable to recognize blue or yellow spectra.

How to improve color accessibility?

You might wonder why to invest effort for a small user group. Good design for color‑blind users often translates to better design for everyone, so a well‑crafted website should be usable by all.

Usability does not require compromising overall aesthetics. To create a friendly experience for CVD users, consider the following five points:

Use color and symbols together . Do not rely solely on color to convey information; combine with icons or patterns. For example, Facebook’s form error messages pair color with symbols.

Limit the number of colors . Fewer colors reduce confusion; minimalist palettes are both timeless and effective for accessibility.

Employ patterns and textures for contrast . Instead of multiple colors, use distinct textures or add text labels to emphasize elements, especially in charts.

Mind color‑contrast and hue‑contrast . Use a range of clear color contrasts and hue differences rather than only black and white. The four‑color scheme in the game Word Feud remains recognizable for all users.

Avoid problematic color combinations . Certain pairings are especially difficult for CVD users. Avoid:

Green and red

Green and brown

Blue and purple

Green and blue

Bright green and yellow

Blue and gray

Green and gray

Green and black

Images illustrating these concepts:

Testing for color blindness

Many people are unaware they have CVD. Common tests include the Ishihara plates, the Colorblindor Android app, the Coblis simulator, and several other mobile apps.

Conclusion

UX designers should aim for universally friendly websites. While no perfect solution exists, remembering these principles—avoid relying solely on color, limit color count, use patterns, ensure contrast, and steer clear of risky color pairs—can greatly improve accessibility for color‑blind users.