An accent is a spotlight. It is reserved for what you want users to notice first — a 'New' badge, a free-trial CTA, a notification indicator. Using accent on more than two roles per screen breaks its emphasis. Triadic, complementary, and split complementary rules tend to produce the strongest accents.
Color glossary
Accent Color
A high-saturation contrast color used sparingly to emphasize one or two elements per screen.
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Primary Color
The signature hue that identifies a brand and drives main CTAs and navigation surfaces.
Secondary Color
A supporting hue that complements the primary, used for less critical UI like tags, secondary buttons, and chart series.
WCAG Contrast Ratio
The luminance ratio between two colors, used by the Web Content Accessibility Guidelines to measure legibility.
Monochrome Palette
A palette built from a single hue, varying only saturation and lightness.
Analogous Palette
Three colors adjacent on the color wheel, typically within 30 degrees of each other.
Complementary Palette
Two hues directly opposite on the color wheel — for example blue and orange, red and green.