Color Contrast and Accessibility: A Practical WCAG Guide
Check text contrast early and use WCAG thresholds as a practical design constraint, not a final audit surprise.
Low-contrast text can make a page difficult or impossible to read for many people, especially in bright environments or on lower-quality displays. Contrast is therefore a functional design requirement, not merely a cosmetic preference.
WCAG contrast ratios compare the relative luminance of foreground and background colors. Common targets are 4.5:1 for normal text and 3:1 for large text at AA, while AAA targets are stricter and may not fit every visual system.
Use /tools/color-contrast-checker while choosing text and background colors, not only after a page is complete. Test hover states, muted copy, buttons, and status colors because a palette can pass in one pairing while failing in another.
Do not rely on color alone to communicate a state such as an error, chart category, or required field. Add clear text, icons, patterns, or structural cues so the meaning remains available when color perception or contrast is limited.
Treat automated contrast checks as a starting point. Real interface review should also consider font size, weight, focus indicators, disabled states, and the way content appears across different screens and lighting conditions.