#637F18#637F18

#637F18 is a mid, vivid yellow-green. Relative luminance 0.179; OKLCH L 55.5% C 0.128 H 124.3°. Best body text is #FFFFFF at 4.59:1 contrast (WCAG AA passes).

Color values

HEX	#637F18
RGB	rgb(99, 127, 24)
HSL	hsl(76, 68%, 30%)
HSV	hsv(76, 81%, 50%)
CMYK	cmyk(22%, 0%, 81.1%, 50.2%)
CIE-LAB	lab(49.37, -24.82, 48.29)
CIE-LCH	lch(49.37, 54.29, 117.20°)
OKLab	oklab(55.51% -0.0725 0.1061)
OKLCH	oklch(55.51% 0.128 124.3)
XYZ	xyz(12.9000, 17.8972, 3.6389)
Luminance	0.1790 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637F18 #34187F

analogous

#7F6818 #637F18 #2F7F18

triadic

#637F18 #18637F #7F1863

tetradic

#637F18 #187F68 #34187F #7F182F

square

#637F18 #187F68 #34187F #7F182F

split-complementary

#637F18 #182F7F #68187F

monochromatic

#141A05 #3B4C0E #637F18 #8BB222 #AED938

Accessibility & contrast

On white

4.59

#637F18 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.58

#637F18 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #637F18

4.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637F18	#FFFFFF	#000000	##FFFFFF
##637F18	1.00	4.59	4.58	4.59
#FFFFFF	4.59	1.00	21.00	1.00
#000000	4.58	21.00	1.00	21.00
##FFFFFF	4.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#877600

Deuteranopia (green-blind)

#837523

Tritanopia (blue-blind)

#68786C

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #637f18;
/* rgb */ color: rgb(99, 127, 24);
/* oklch */ color: oklch(55.5% 0.128 124.3);

Tailwind

colors: {
  custom: {
    50: '#93a45f',
    500: '#637f18',
    950: '#000000',
  },
}

SCSS

$custom: #637f18;
$custom-light: #93a45f;
$custom-dark: #000000;

JSON

{
  "hex": "#637f18",
  "rgb": {
    "r": 99,
    "g": 127,
    "b": 24
  },
  "hsl": {
    "h": 76.311,
    "s": 68.212,
    "l": 29.608
  },
  "oklch": {
    "l": 0.55513,
    "c": 0.12847,
    "h": 124.3
  },
  "luminance": 0.17897
}

Semantic roles & 50–950 ramp

primary

#637F18

secondary

#5F3FB3

accent

#3DEB6C

background

#F9FAF5

surface

#F2F4EA

border

#CCCEC6

text

#0D0F05

muted

#7E7F79

Preview Lab

Preview with #637F18

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

Preview Lab → · Contrast checker → · Palette generator →