Tetradic is the most colorful basic scheme. It is risky in product UI because it gives you four contenders for primary. Use it for editorial layouts, dashboards with many chart series, or marketing pages with distinct sections — and decide hierarchy first.
Color glossary
Tetradic Palette
Four colors arranged into two complementary pairs on the color wheel.
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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.
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.