#428F18#428F18

#428F18 is a mid, vivid yellow-green. Relative luminance 0.209; OKLCH L 57.9% C 0.166 H 137.5°. Best body text is #000000 at 5.17:1 contrast (WCAG AA passes).

Color values

HEX	#428F18
RGB	rgb(66, 143, 24)
HSL	hsl(99, 71%, 33%)
HSV	hsv(99, 83%, 56%)
CMYK	cmyk(53.8%, 0%, 83.2%, 43.9%)
CIE-LAB	lab(52.80, -44.12, 50.80)
CIE-LCH	lch(52.80, 67.29, 130.98°)
OKLab	oklab(57.86% -0.1224 0.1121)
OKLCH	oklch(57.86% 0.166 137.5)
XYZ	xyz(12.2337, 20.8682, 4.2473)
Luminance	0.2087 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428F18 #65188F

analogous

#7D8F18 #428F18 #188F2A

triadic

#428F18 #18428F #8F1842

tetradic

#428F18 #187D8F #65188F #8F2A18

square

#428F18 #187D8F #65188F #8F2A18

split-complementary

#428F18 #2A188F #8F187D

monochromatic

#122606 #2A5B0F #428F18 #5AC321 #7ADF42

Accessibility & contrast

On white

4.06

#428F18 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.17

#428F18 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428F18

5.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428F18	#FFFFFF	#000000	##000000
##428F18	1.00	4.06	5.17	5.17
#FFFFFF	4.06	1.00	21.00	21.00
#000000	5.17	21.00	1.00	1.00
##000000	5.17	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#948200

Deuteranopia (green-blind)

#8A7C27

Tritanopia (blue-blind)

#3C8A7A

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #428f18;
/* rgb */ color: rgb(66, 143, 24);
/* oklch */ color: oklch(57.9% 0.166 137.5);

Tailwind

colors: {
  custom: {
    50: '#7fb061',
    500: '#428f18',
    950: '#000000',
  },
}

SCSS

$custom: #428f18;
$custom-light: #7fb061;
$custom-dark: #000000;

JSON

{
  "hex": "#428f18",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 24
  },
  "hsl": {
    "h": 98.824,
    "s": 71.257,
    "l": 32.745
  },
  "oklch": {
    "l": 0.57855,
    "c": 0.166,
    "h": 137.5
  },
  "luminance": 0.20869
}

Semantic roles & 50–950 ramp

primary

#428F18

secondary

#9443C0

accent

#3AEEAE

background

#F8FAF6

surface

#EFF5EB

border

#CACFC6

text

#0B1105

muted

#7C807A

Preview Lab

Preview with #428F18

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

Preview Lab → · Contrast checker → · Palette generator →