#637D18#637D18

#637D18 is a mid, vivid yellow-green. Relative luminance 0.174; OKLCH L 55.0% C 0.126 H 123.6°. Best body text is #FFFFFF at 4.69:1 contrast (WCAG AA passes).

Color values

HEX	#637D18
RGB	rgb(99, 125, 24)
HSL	hsl(75, 68%, 29%)
HSV	hsv(75, 81%, 49%)
CMYK	cmyk(20.8%, 0%, 80.8%, 51%)
CIE-LAB	lab(48.74, -23.82, 47.71)
CIE-LCH	lch(48.74, 53.33, 116.53°)
OKLab	oklab(55% -0.0698 0.1049)
OKLCH	oklch(55% 0.126 123.6)
XYZ	xyz(12.6442, 17.3857, 3.5536)
Luminance	0.1739 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637D18 #32187D

analogous

#7D6518 #637D18 #307D18

triadic

#637D18 #18637D #7D1863

tetradic

#637D18 #187D65 #32187D #7D1830

square

#637D18 #187D65 #32187D #7D1830

split-complementary

#637D18 #18307D #65187D

monochromatic

#141A05 #3A4A0E #637D18 #8CB022 #AFD937

Accessibility & contrast

On white

4.69

#637D18 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.48

#637D18 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #637D18

4.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637D18	#FFFFFF	#000000	##FFFFFF
##637D18	1.00	4.69	4.48	4.69
#FFFFFF	4.69	1.00	21.00	1.00
#000000	4.48	21.00	1.00	21.00
##FFFFFF	4.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#857500

Deuteranopia (green-blind)

#817422

Tritanopia (blue-blind)

#68766A

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #637d18;
/* rgb */ color: rgb(99, 125, 24);
/* oklch */ color: oklch(55.0% 0.126 123.6);

Tailwind

colors: {
  custom: {
    50: '#93a25e',
    500: '#637d18',
    950: '#000000',
  },
}

SCSS

$custom: #637d18;
$custom-light: #93a25e;
$custom-dark: #000000;

JSON

{
  "hex": "#637d18",
  "rgb": {
    "r": 99,
    "g": 125,
    "b": 24
  },
  "hsl": {
    "h": 75.446,
    "s": 67.785,
    "l": 29.216
  },
  "oklch": {
    "l": 0.55004,
    "c": 0.12594,
    "h": 123.6
  },
  "luminance": 0.17386
}

Semantic roles & 50–950 ramp

primary

#637D18

secondary

#5D3FB2

accent

#3DEB6A

background

#F9FAF5

surface

#F2F3EA

border

#CCCDC6

text

#0D0F05

muted

#7E7F79

Preview Lab

Preview with #637D18

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

Preview Lab → · Contrast checker → · Palette generator →