Use of Color (1.4.1)

Color must not be the only means of conveying information, indicating an action, prompting a response, or distinguishing a visual element.

WCAG Reference

Applies to: WCAG 2.0, WCAG 2.1, WCAG 2.2 Introduced in: WCAG 2.0 | Level: A | Read the official specification →

What this rule checks

The scanner flags instances where meaning is communicated exclusively through color without a secondary visual indicator such as text, icons, patterns, or underlines.

Why it matters

Users with color-vision deficiency, low vision, or monochrome displays cannot distinguish elements when the only differentiator is color. Adding a secondary cue ensures everyone perceives the intended meaning.

Common failure patterns

required form fields marked only with red text
chart series differentiated only by color with no patterns or labels
links within body text that are distinguished only by color (no underline or icon)
status indicators (success/error) using only green/red with no text or icon

Remediation guidance

pair color with a text label, icon, pattern, or border change
underline links or add a visible icon to distinguish them from surrounding text
use patterns, hatching, or data labels in charts alongside color
test the interface with a color-blindness simulator to confirm the secondary cue is visible