Secondary colors are workhorses. They show up in chart palettes, badges, secondary buttons, and information surfaces where the primary color would feel too loud. A good secondary shares enough hue family with the primary to feel related, but differs enough in saturation or temperature to be readable side by side.
Color glossary
Secondary Color
A supporting hue that complements the primary, used for less critical UI like tags, secondary buttons, and chart series.
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Primary Color
The signature hue that identifies a brand and drives main CTAs and navigation surfaces.
Accent Color
A high-saturation contrast color used sparingly to emphasize one or two elements per screen.
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.