#66B828#66B828

#66B828 is a light, vivid yellow-green. Relative luminance 0.373; OKLCH L 70.4% C 0.190 H 135.3°. Best body text is #000000 at 8.45:1 contrast (WCAG AA passes).

Color values

HEX	#66B828
RGB	rgb(102, 184, 40)
HSL	hsl(94, 64%, 44%)
HSV	hsv(94, 78%, 72%)
CMYK	cmyk(44.6%, 0%, 78.3%, 27.8%)
CIE-LAB	lab(67.47, -48.19, 60.19)
CIE-LCH	lch(67.47, 77.11, 128.68°)
OKLab	oklab(70.35% -0.1348 0.1336)
OKLCH	oklch(70.35% 0.19 135.3)
XYZ	xyz(23.0025, 37.2576, 7.9865)
Luminance	0.3726 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B828 #7A28B8

analogous

#AEB828 #66B828 #28B832

triadic

#66B828 #2866B8 #B82866

tetradic

#66B828 #28AEB8 #7A28B8 #B83228

square

#66B828 #28AEB8 #7A28B8 #B83228

split-complementary

#66B828 #3228B8 #B828AE

monochromatic

#2E5312 #4A861D #66B828 #85D746 #A6E279

Accessibility & contrast

On white

2.48

#66B828 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.45

#66B828 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B828

8.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B828	#FFFFFF	#000000	##000000
##66B828	1.00	2.48	8.45	8.45
#FFFFFF	2.48	1.00	21.00	21.00
#000000	8.45	21.00	1.00	1.00
##000000	8.45	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#BFA900

Deuteranopia (green-blind)

#B4A238

Tritanopia (blue-blind)

#64B19D

Achromatopsia (no color)

#A4A4A4

Design tokens & code

CSS

--color: #66b828;
/* rgb */ color: rgb(102, 184, 40);
/* oklch */ color: oklch(70.4% 0.190 135.3);

Tailwind

colors: {
  custom: {
    50: '#99ce6e',
    500: '#66b828',
    950: '#000000',
  },
}

SCSS

$custom: #66b828;
$custom-light: #99ce6e;
$custom-dark: #000000;

JSON

{
  "hex": "#66b828",
  "rgb": {
    "r": 102,
    "g": 184,
    "b": 40
  },
  "hsl": {
    "h": 94.167,
    "s": 64.286,
    "l": 43.922
  },
  "oklch": {
    "l": 0.70351,
    "c": 0.18976,
    "h": 135.3
  },
  "luminance": 0.37259
}

Semantic roles & 50–950 ramp

primary

#66B828

secondary

#A472CA

accent

#41E79F

background

#F9FCF7

surface

#F2F9ED

border

#CCD2C8

text

#0F1308

muted

#7E827B

Preview Lab

Preview with #66B828

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

Preview Lab → · Contrast checker → · Palette generator →