#663FCA Color
#663FCA is rgb(102, 63, 202) in RGB and hsl(257, 57%, 52%) in HSL. The closest CSS named color is SlateBlue. White text is most readable on this background.
#663FCA
HEX
#663FCARGB
rgb(102, 63, 202)HSL
hsl(257, 57%, 52%)HSV
hsv(257, 69%, 79%)OKLCH
oklch(49.6% 0.202 289.8)CMYK
cmyk(50%, 69%, 0%, 21%)Text Contrast & Accessibility
WCAG contrast ratios for text on a #663FCA background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1.
TextWhite text6.71:1AA normal ✓AA large ✓AAA normal ✗
TextBlack text3.13:1AA normal ✗AA large ✓AAA normal ✗
Color Harmonies
Colors that pair well with #663FCA based on color wheel relationships. Click any swatch for its full breakdown.
Tints & Shades
Lighter tints and darker shades of #663FCA, useful for hover states, backgrounds, and text variants.