Hex is the dominant color format on the web because it is compact and unambiguous. #FF6B6B means red 255, green 107, blue 107. Three-character shorthand like #F66 expands to #FF6666. Designers and developers both speak hex, which is why every export in this tool defaults to it.
Color glossary
Hex Color
A six-character hexadecimal representation of an RGB color, prefixed with #.
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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.