#66B528#66B528

#66B528 is a light, vivid yellow-green. Relative luminance 0.360; OKLCH L 69.6% C 0.186 H 135.0°. Best body text is #000000 at 8.21:1 contrast (WCAG AA passes).

Color values

HEX	#66B528
RGB	rgb(102, 181, 40)
HSL	hsl(94, 64%, 43%)
HSV	hsv(94, 78%, 71%)
CMYK	cmyk(43.6%, 0%, 77.9%, 29%)
CIE-LAB	lab(66.54, -46.99, 59.31)
CIE-LCH	lch(66.54, 75.67, 128.39°)
OKLab	oklab(69.59% -0.1315 0.1318)
OKLCH	oklch(69.59% 0.186 135)
XYZ	xyz(22.3859, 36.0244, 7.7809)
Luminance	0.3603 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B528 #7728B5

analogous

#ACB528 #66B528 #28B530

triadic

#66B528 #2866B5 #B52866

tetradic

#66B528 #28ACB5 #7728B5 #B53028

square

#66B528 #28ACB5 #7728B5 #B53028

split-complementary

#66B528 #3028B5 #B528AC

monochromatic

#2E5112 #4A831D #66B528 #84D644 #A5E177

Accessibility & contrast

On white

2.56

#66B528 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.21

#66B528 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B528

8.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B528	#FFFFFF	#000000	##000000
##66B528	1.00	2.56	8.21	8.21
#FFFFFF	2.56	1.00	21.00	21.00
#000000	8.21	21.00	1.00	1.00
##000000	8.21	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#BCA600

Deuteranopia (green-blind)

#B19F37

Tritanopia (blue-blind)

#64AE9B

Achromatopsia (no color)

#A2A2A2

Design tokens & code

CSS

--color: #66b528;
/* rgb */ color: rgb(102, 181, 40);
/* oklch */ color: oklch(69.6% 0.186 135.0);

Tailwind

colors: {
  custom: {
    50: '#99cc6d',
    500: '#66b528',
    950: '#000000',
  },
}

SCSS

$custom: #66b528;
$custom-light: #99cc6d;
$custom-dark: #000000;

JSON

{
  "hex": "#66b528",
  "rgb": {
    "r": 102,
    "g": 181,
    "b": 40
  },
  "hsl": {
    "h": 93.617,
    "s": 63.801,
    "l": 43.333
  },
  "oklch": {
    "l": 0.69587,
    "c": 0.18617,
    "h": 135
  },
  "luminance": 0.36026
}

Semantic roles & 50–950 ramp

primary

#66B528

secondary

#A270C8

accent

#41E79E

background

#F9FCF6

surface

#F2F9EC

border

#CCD2C7

text

#0E1308

muted

#7E827B

Preview Lab

Preview with #66B528

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

Preview Lab → · Contrast checker → · Palette generator →