#66C538#66C538

#66C538 is a light, vivid green. Relative luminance 0.430; OKLCH L 73.8% C 0.197 H 137.4°. Best body text is #000000 at 9.61:1 contrast (WCAG AA passes).

Color values

HEX	#66C538
RGB	rgb(102, 197, 56)
HSL	hsl(100, 56%, 50%)
HSV	hsv(100, 72%, 77%)
CMYK	cmyk(48.2%, 0%, 71.6%, 22.7%)
CIE-LAB	lab(71.58, -52.28, 58.80)
CIE-LCH	lch(71.58, 78.68, 131.64°)
OKLab	oklab(73.76% -0.1448 0.133)
OKLCH	oklch(73.76% 0.197 137.4)
XYZ	xyz(26.1587, 43.0410, 10.6700)
Luminance	0.4304 (WCAG relative)
Temperature	warm
Family	green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66C538 #9738C5

analogous

#ACC538 #66C538 #38C551

triadic

#66C538 #3866C5 #C53866

tetradic

#66C538 #38ACC5 #9738C5 #C55138

square

#66C538 #38ACC5 #9738C5 #C55138

split-complementary

#66C538 #5138C5 #C538AC

monochromatic

#35661D #4D952A #66C538 #8AD467 #AFE196

Accessibility & contrast

On white

2.19

#66C538 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.61

#66C538 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66C538

9.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66C538	#FFFFFF	#000000	##000000
##66C538	1.00	2.19	9.61	9.61
#FFFFFF	2.19	1.00	21.00	21.00
#000000	9.61	21.00	1.00	1.00
##000000	9.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#CBB420

Deuteranopia (green-blind)

#BFAC46

Tritanopia (blue-blind)

#60BEA9

Achromatopsia (no color)

#AFAFAF

Design tokens & code

CSS

--color: #66c538;
/* rgb */ color: rgb(102, 197, 56);
/* oklch */ color: oklch(73.8% 0.197 137.4);

Tailwind

colors: {
  custom: {
    50: '#9ad777',
    500: '#66c538',
    950: '#000000',
  },
}

SCSS

$custom: #66c538;
$custom-light: #9ad777;
$custom-dark: #000000;

JSON

{
  "hex": "#66c538",
  "rgb": {
    "r": 102,
    "g": 197,
    "b": 56
  },
  "hsl": {
    "h": 100.426,
    "s": 55.731,
    "l": 49.608
  },
  "oklch": {
    "l": 0.73759,
    "c": 0.19655,
    "h": 137.4
  },
  "luminance": 0.43043
}

Semantic roles & 50–950 ramp

primary

#66C538

secondary

#B88CCD

accent

#49DFAE

background

#FAFDF7

surface

#F3FAEE

border

#CDD3C9

text

#0F1409

muted

#7F837B

Preview Lab

Preview with #66C538

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

Preview Lab → · Contrast checker → · Palette generator →