#66BC39#66BC39

#66BC39 is a light, vivid yellow-green. Relative luminance 0.391; OKLCH L 71.5% C 0.185 H 136.9°. Best body text is #000000 at 8.82:1 contrast (WCAG AA passes).

Color values

HEX	#66BC39
RGB	rgb(102, 188, 57)
HSL	hsl(99, 53%, 48%)
HSV	hsv(99, 70%, 74%)
CMYK	cmyk(45.7%, 0%, 69.7%, 26.3%)
CIE-LAB	lab(68.81, -48.67, 55.58)
CIE-LCH	lch(68.81, 73.87, 131.21°)
OKLab	oklab(71.49% -0.1349 0.1263)
OKLCH	oklch(71.49% 0.185 136.9)
XYZ	xyz(24.2005, 39.0851, 10.1391)
Luminance	0.3909 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66BC39 #8F39BC

analogous

#A7BC39 #66BC39 #39BC4D

triadic

#66BC39 #3966BC #BC3966

tetradic

#66BC39 #39A7BC #8F39BC #BC4D39

square

#66BC39 #39A7BC #8F39BC #BC4D39

split-complementary

#66BC39 #4D39BC #BC39A7

monochromatic

#335E1D #4D8D2B #66BC39 #88D063 #ACDE92

Accessibility & contrast

On white

2.38

#66BC39 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.82

#66BC39 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66BC39

8.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66BC39	#FFFFFF	#000000	##000000
##66BC39	1.00	2.38	8.82	8.82
#FFFFFF	2.38	1.00	21.00	21.00
#000000	8.82	21.00	1.00	1.00
##000000	8.82	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#C2AC25

Deuteranopia (green-blind)

#B7A545

Tritanopia (blue-blind)

#62B5A2

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #66bc39;
/* rgb */ color: rgb(102, 188, 57);
/* oklch */ color: oklch(71.5% 0.185 136.9);

Tailwind

colors: {
  custom: {
    50: '#99d177',
    500: '#66bc39',
    950: '#000000',
  },
}

SCSS

$custom: #66bc39;
$custom-light: #99d177;
$custom-dark: #000000;

JSON

{
  "hex": "#66bc39",
  "rgb": {
    "r": 102,
    "g": 188,
    "b": 57
  },
  "hsl": {
    "h": 99.389,
    "s": 53.469,
    "l": 48.039
  },
  "oklch": {
    "l": 0.71486,
    "c": 0.18484,
    "h": 136.9
  },
  "luminance": 0.39087
}

Semantic roles & 50–950 ramp

primary

#66BC39

secondary

#B388C9

accent

#4BDDAB

background

#F9FCF7

surface

#F2F9ED

border

#CCD2C8

text

#0E1409

muted

#7E827B

Preview Lab

Preview with #66BC39

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

Preview Lab → · Contrast checker → · Palette generator →