#66D421 Color
#66D421 is rgb(102, 212, 33) in RGB and hsl(97, 73%, 48%) in HSL. The closest CSS named color is LimeGreen. Black text is most readable on this background.
#66D421
HEX
#66D421RGB
rgb(102, 212, 33)HSL
hsl(97, 73%, 48%)HSV
hsv(97, 84%, 83%)OKLCH
oklch(77.4% 0.225 137.1)CMYK
cmyk(52%, 0%, 84%, 17%)Text Contrast & Accessibility
WCAG contrast ratios for text on a #66D421 background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1.
TextWhite text1.91:1AA normal ✗AA large ✗AAA normal ✗
TextBlack text11:1AA normal ✓AA large ✓AAA normal ✓
Color Harmonies
Colors that pair well with #66D421 based on color wheel relationships. Click any swatch for its full breakdown.
Tints & Shades
Lighter tints and darker shades of #66D421, useful for hover states, backgrounds, and text variants.