Color contrast accessibility ensures text is readable for all users, including those with visual impairments. WCAG requires 4.5:1 ratio for normal text.
Color contrast accessibility refers to ensuring sufficient luminance difference between text (or UI elements) and their background, as measured by the WCAG (Web Content Accessibility Guidelines) contrast ratio.
WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18px+ bold or 24px+ regular). The ratio is calculated from the relative luminance of the foreground and background colors. Many brand palettes look beautiful but fail contrast checks — light purple text on white, gray text on light gray backgrounds, etc. Tools like Chrome DevTools and WebAIM's contrast checker make this easy to verify.
About 8% of men have some form of color vision deficiency. Even users with normal vision struggle with low-contrast text in bright sunlight or on cheap monitors. Accessibility isn't just about compliance — it's about making your product usable by everyone. And in many jurisdictions, it's a legal requirement.
Primary indigo (#6366F1) on white (#FFFFFF): contrast ratio 4.6:1 ✅ passes AA. The same indigo on light gray (#F3F4F6): 3.9:1 ❌ fails for normal text. Solution: use the 700 shade (#4338CA) on light backgrounds for 7.0:1.
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