#428F1B#428F1B

#428F1B is a mid, vivid yellow-green. Relative luminance 0.209; OKLCH L 57.9% C 0.165 H 137.7°. Best body text is #000000 at 5.18:1 contrast (WCAG AA passes).

Color values

HEX	#428F1B
RGB	rgb(66, 143, 27)
HSL	hsl(100, 68%, 33%)
HSV	hsv(100, 81%, 56%)
CMYK	cmyk(53.8%, 0%, 81.1%, 43.9%)
CIE-LAB	lab(52.82, -43.96, 49.91)
CIE-LCH	lch(52.82, 66.51, 131.37°)
OKLab	oklab(57.87% -0.1218 0.1107)
OKLCH	oklch(57.87% 0.165 137.7)
XYZ	xyz(12.2666, 20.8814, 4.4208)
Luminance	0.2088 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428F1B #681B8F

analogous

#7C8F1B #428F1B #1B8F2E

triadic

#428F1B #1B428F #8F1B42

tetradic

#428F1B #1B7C8F #681B8F #8F2E1B

square

#428F1B #1B7C8F #681B8F #8F2E1B

split-complementary

#428F1B #2E1B8F #8F1B7C

monochromatic

#122808 #2A5C11 #428F1B #5AC225 #7ADC48

Accessibility & contrast

On white

4.06

#428F1B on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.18

#428F1B on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428F1B

5.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428F1B	#FFFFFF	#000000	##000000
##428F1B	1.00	4.06	5.18	5.18
#FFFFFF	4.06	1.00	21.00	21.00
#000000	5.18	21.00	1.00	1.00
##000000	5.18	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#948200

Deuteranopia (green-blind)

#8A7C29

Tritanopia (blue-blind)

#3C8A7A

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #428f1b;
/* rgb */ color: rgb(66, 143, 27);
/* oklch */ color: oklch(57.9% 0.165 137.7);

Tailwind

colors: {
  custom: {
    50: '#7fb062',
    500: '#428f1b',
    950: '#000000',
  },
}

SCSS

$custom: #428f1b;
$custom-light: #7fb062;
$custom-dark: #000000;

JSON

{
  "hex": "#428f1b",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 27
  },
  "hsl": {
    "h": 99.828,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.57872,
    "c": 0.1646,
    "h": 137.7
  },
  "luminance": 0.20882
}

Semantic roles & 50–950 ramp

primary

#428F1B

secondary

#9648BE

accent

#3DEBB0

background

#F8FAF6

surface

#EFF5EB

border

#CACFC6

text

#0B1106

muted

#7C807A

Preview Lab

Preview with #428F1B

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

Preview Lab → · Contrast checker → · Palette generator →