#21B5A4 Color
#21B5A4 is rgb(33, 181, 164) in RGB and hsl(173, 69%, 42%) in HSL. The closest CSS named color is LightSeaGreen. Black text is most readable on this background.
#21B5A4
HEX
#21B5A4RGB
rgb(33, 181, 164)HSL
hsl(173, 69%, 42%)HSV
hsv(173, 82%, 71%)OKLCH
oklch(69.7% 0.118 182.8)CMYK
cmyk(82%, 0%, 9%, 29%)Text Contrast & Accessibility
WCAG contrast ratios for text on a #21B5A4 background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1.
TextWhite text2.56:1AA normal ✗AA large ✗AAA normal ✗
TextBlack text8.21:1AA normal ✓AA large ✓AAA normal ✓
Color Harmonies
Colors that pair well with #21B5A4 based on color wheel relationships. Click any swatch for its full breakdown.
Tints & Shades
Lighter tints and darker shades of #21B5A4, useful for hover states, backgrounds, and text variants.