#66C839#66C839

#66C839 is a light, vivid green. Relative luminance 0.444; OKLCH L 74.5% C 0.200 H 137.7°. Best body text is #000000 at 9.89:1 contrast (WCAG AA passes).

Color values

HEX	#66C839
RGB	rgb(102, 200, 57)
HSL	hsl(101, 57%, 50%)
HSV	hsv(101, 72%, 78%)
CMYK	cmyk(49%, 0%, 71.5%, 21.6%)
CIE-LAB	lab(72.51, -53.36, 59.38)
CIE-LCH	lch(72.51, 79.83, 131.94°)
OKLab	oklab(74.53% -0.1476 0.1343)
OKLCH	oklch(74.53% 0.2 137.7)
XYZ	xyz(26.8714, 44.4268, 11.0294)
Luminance	0.4443 (WCAG relative)
Temperature	warm
Family	green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66C839 #9B39C8

analogous

#ADC839 #66C839 #39C853

triadic

#66C839 #3966C8 #C83966

tetradic

#66C839 #39ADC8 #9B39C8 #C85339

square

#66C839 #39ADC8 #9B39C8 #C85339

split-complementary

#66C839 #5339C8 #C839AD

monochromatic

#35691D #4D992B #66C839 #8BD569 #B0E399

Accessibility & contrast

On white

2.12

#66C839 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.89

#66C839 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66C839

9.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66C839	#FFFFFF	#000000	##000000
##66C839	1.00	2.12	9.89	9.89
#FFFFFF	2.12	1.00	21.00	21.00
#000000	9.89	21.00	1.00	1.00
##000000	9.89	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#CEB720

Deuteranopia (green-blind)

#C2AF47

Tritanopia (blue-blind)

#5FC1AC

Achromatopsia (no color)

#B2B2B2

Design tokens & code

CSS

--color: #66c839;
/* rgb */ color: rgb(102, 200, 57);
/* oklch */ color: oklch(74.5% 0.200 137.7);

Tailwind

colors: {
  custom: {
    50: '#9ad978',
    500: '#66c839',
    950: '#000000',
  },
}

SCSS

$custom: #66c839;
$custom-light: #9ad978;
$custom-dark: #000000;

JSON

{
  "hex": "#66c839",
  "rgb": {
    "r": 102,
    "g": 200,
    "b": 57
  },
  "hsl": {
    "h": 101.119,
    "s": 56.522,
    "l": 50.392
  },
  "oklch": {
    "l": 0.74526,
    "c": 0.19957,
    "h": 137.7
  },
  "luminance": 0.44429
}

Semantic roles & 50–950 ramp

primary

#66C839

secondary

#BA8FCE

accent

#48E0B0

background

#FAFDF7

surface

#F3FBEE

border

#CDD4C9

text

#0F1509

muted

#7F837B

Preview Lab

Preview with #66C839

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

Preview Lab → · Contrast checker → · Palette generator →