#66CC31#66CC31

#66CC31 is a light, highly saturated yellow-green. Relative luminance 0.462; OKLCH L 75.5% C 0.209 H 137.4°. Best body text is #000000 at 10.25:1 contrast (WCAG AA passes).

Color values

HEX	#66CC31
RGB	rgb(102, 204, 49)
HSL	hsl(99, 61%, 50%)
HSV	hsv(99, 76%, 80%)
CMYK	cmyk(50%, 0%, 76%, 20%)
CIE-LAB	lab(73.69, -55.41, 63.30)
CIE-LCH	lch(73.69, 84.13, 131.20°)
OKLab	oklab(75.48% -0.1536 0.1414)
OKLCH	oklch(75.48% 0.209 137.4)
XYZ	xyz(27.6258, 46.2303, 10.3727)
Luminance	0.4623 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66CC31 #9731CC

analogous

#B4CC31 #66CC31 #31CC4A

triadic

#66CC31 #3166CC #CC3166

tetradic

#66CC31 #31B4CC #9731CC #CC4A31

square

#66CC31 #31B4CC #9731CC #CC4A31

split-complementary

#66CC31 #4A31CC #CC31B4

monochromatic

#356919 #4D9B25 #66CC31 #8AD961 #AFE592

Accessibility & contrast

On white

2.05

#66CC31 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.25

#66CC31 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66CC31

10.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66CC31	#FFFFFF	#000000	##000000
##66CC31	1.00	2.05	10.25	10.25
#FFFFFF	2.05	1.00	21.00	21.00
#000000	10.25	21.00	1.00	1.00
##000000	10.25	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#D3BA09

Deuteranopia (green-blind)

#C5B242

Tritanopia (blue-blind)

#5FC5AF

Achromatopsia (no color)

#B5B5B5

Design tokens & code

CSS

--color: #66cc31;
/* rgb */ color: rgb(102, 204, 49);
/* oklch */ color: oklch(75.5% 0.209 137.4);

Tailwind

colors: {
  custom: {
    50: '#9bdc74',
    500: '#66cc31',
    950: '#000000',
  },
}

SCSS

$custom: #66cc31;
$custom-light: #9bdc74;
$custom-dark: #000000;

JSON

{
  "hex": "#66cc31",
  "rgb": {
    "r": 102,
    "g": 204,
    "b": 49
  },
  "hsl": {
    "h": 99.484,
    "s": 61.265,
    "l": 49.608
  },
  "oklch": {
    "l": 0.75483,
    "c": 0.2088,
    "h": 137.4
  },
  "luminance": 0.46232
}

Semantic roles & 50–950 ramp

primary

#66CC31

secondary

#B889D0

accent

#43E4AD

background

#FAFDF7

surface

#F4FBED

border

#CED4C8

text

#0F1509

muted

#7F837B

Preview Lab

Preview with #66CC31

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

Preview Lab → · Contrast checker → · Palette generator →