#66BC37#66BC37

#66BC37 is a light, vivid yellow-green. Relative luminance 0.391; OKLCH L 71.5% C 0.186 H 136.7°. Best body text is #000000 at 8.81:1 contrast (WCAG AA passes).

Color values

HEX	#66BC37
RGB	rgb(102, 188, 55)
HSL	hsl(99, 55%, 48%)
HSV	hsv(99, 71%, 74%)
CMYK	cmyk(45.7%, 0%, 70.7%, 26.3%)
CIE-LAB	lab(68.80, -48.82, 56.33)
CIE-LCH	lch(68.80, 74.54, 130.92°)
OKLab	oklab(71.47% -0.1355 0.1277)
OKLCH	oklch(71.47% 0.186 136.7)
XYZ	xyz(24.1516, 39.0655, 9.8815)
Luminance	0.3907 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66BC37 #8D37BC

analogous

#A9BC37 #66BC37 #37BC4A

triadic

#66BC37 #3766BC #BC3766

tetradic

#66BC37 #37A9BC #8D37BC #BC4A37

square

#66BC37 #37A9BC #8D37BC #BC4A37

split-complementary

#66BC37 #4A37BC #BC37A9

monochromatic

#335D1B #4C8D29 #66BC37 #88D060 #ABDE8F

Accessibility & contrast

On white

2.38

#66BC37 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.81

#66BC37 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66BC37

8.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66BC37	#FFFFFF	#000000	##000000
##66BC37	1.00	2.38	8.81	8.81
#FFFFFF	2.38	1.00	21.00	21.00
#000000	8.81	21.00	1.00	1.00
##000000	8.81	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#C2AC21

Deuteranopia (green-blind)

#B7A544

Tritanopia (blue-blind)

#62B5A2

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #66bc37;
/* rgb */ color: rgb(102, 188, 55);
/* oklch */ color: oklch(71.5% 0.186 136.7);

Tailwind

colors: {
  custom: {
    50: '#99d176',
    500: '#66bc37',
    950: '#000000',
  },
}

SCSS

$custom: #66bc37;
$custom-light: #99d176;
$custom-dark: #000000;

JSON

{
  "hex": "#66bc37",
  "rgb": {
    "r": 102,
    "g": 188,
    "b": 55
  },
  "hsl": {
    "h": 98.797,
    "s": 54.733,
    "l": 47.647
  },
  "oklch": {
    "l": 0.7147,
    "c": 0.18614,
    "h": 136.7
  },
  "luminance": 0.39067
}

Semantic roles & 50–950 ramp

primary

#66BC37

secondary

#B186C9

accent

#4ADEAA

background

#F9FCF7

surface

#F2F9ED

border

#CCD2C8

text

#0E1409

muted

#7E827B

Preview Lab

Preview with #66BC37

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →