#66B31C#66B31C

#66B31C is a light, vivid yellow-green. Relative luminance 0.351; OKLCH L 69.0% C 0.189 H 134.1°. Best body text is #000000 at 8.03:1 contrast (WCAG AA passes).

Color values

HEX	#66B31C
RGB	rgb(102, 179, 28)
HSL	hsl(91, 73%, 41%)
HSV	hsv(91, 84%, 70%)
CMYK	cmyk(43%, 0%, 84.4%, 29.8%)
CIE-LAB	lab(65.86, -46.76, 62.05)
CIE-LCH	lch(65.86, 77.70, 127.00°)
OKLab	oklab(69.02% -0.1316 0.1358)
OKLCH	oklch(69.02% 0.189 134.1)
XYZ	xyz(21.8088, 35.1476, 6.7334)
Luminance	0.3515 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B31C #691CB3

analogous

#B1B31C #66B31C #1CB31D

triadic

#66B31C #1C66B3 #B31C66

tetradic

#66B31C #1CB1B3 #691CB3 #B31D1C

square

#66B31C #1CB1B3 #691CB3 #B31D1C

split-complementary

#66B31C #1D1CB3 #B31CB1

monochromatic

#2A490B #487E14 #66B31C #84DE2E #A3E763

Accessibility & contrast

On white

2.62

#66B31C on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.03

#66B31C on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B31C

8.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B31C	#FFFFFF	#000000	##000000
##66B31C	1.00	2.62	8.03	8.03
#FFFFFF	2.62	1.00	21.00	21.00
#000000	8.03	21.00	1.00	1.00
##000000	8.03	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#BAA400

Deuteranopia (green-blind)

#B09E30

Tritanopia (blue-blind)

#65AC98

Achromatopsia (no color)

#A0A0A0

Design tokens & code

CSS

--color: #66b31c;
/* rgb */ color: rgb(102, 179, 28);
/* oklch */ color: oklch(69.0% 0.189 134.1);

Tailwind

colors: {
  custom: {
    50: '#99ca68',
    500: '#66b31c',
    950: '#000000',
  },
}

SCSS

$custom: #66b31c;
$custom-light: #99ca68;
$custom-dark: #000000;

JSON

{
  "hex": "#66b31c",
  "rgb": {
    "r": 102,
    "g": 179,
    "b": 28
  },
  "hsl": {
    "h": 90.596,
    "s": 72.947,
    "l": 40.588
  },
  "oklch": {
    "l": 0.69016,
    "c": 0.18906,
    "h": 134.1
  },
  "luminance": 0.35149
}

Semantic roles & 50–950 ramp

primary

#66B31C

secondary

#965FCB

accent

#38F096

background

#F9FCF6

surface

#F2F8EB

border

#CCD1C6

text

#0F1307

muted

#7E827A

Preview Lab

Preview with #66B31C

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

Preview Lab → · Contrast checker → · Palette generator →