#66BC1C#66BC1C

#66BC1C is a light, vivid yellow-green. Relative luminance 0.389; OKLCH L 71.3% C 0.199 H 135.0°. Best body text is #000000 at 8.77:1 contrast (WCAG AA passes).

Color values

HEX	#66BC1C
RGB	rgb(102, 188, 28)
HSL	hsl(92, 74%, 42%)
HSV	hsv(92, 85%, 74%)
CMYK	cmyk(45.7%, 0%, 85.1%, 26.3%)
CIE-LAB	lab(68.66, -50.33, 64.51)
CIE-LCH	lch(68.66, 81.82, 127.96°)
OKLab	oklab(71.31% -0.1411 0.141)
OKLCH	oklch(71.31% 0.199 135)
XYZ	xyz(23.6718, 38.8736, 7.3544)
Luminance	0.3887 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66BC1C #721CBC

analogous

#B6BC1C #66BC1C #1CBC22

triadic

#66BC1C #1C66BC #BC1C66

tetradic

#66BC1C #1CB6BC #721CBC #BC221C

square

#66BC1C #1CB6BC #721CBC #BC221C

split-complementary

#66BC1C #221CBC #BC1CB6

monochromatic

#2C510C #498714 #66BC1C #84E134 #A4E96A

Accessibility & contrast

On white

2.39

#66BC1C on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.77

#66BC1C on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66BC1C

8.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66BC1C	#FFFFFF	#000000	##000000
##66BC1C	1.00	2.39	8.77	8.77
#FFFFFF	2.39	1.00	21.00	21.00
#000000	8.77	21.00	1.00	1.00
##000000	8.77	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#C3AC00

Deuteranopia (green-blind)

#B8A531

Tritanopia (blue-blind)

#64B5A0

Achromatopsia (no color)

#A7A7A7

Design tokens & code

CSS

--color: #66bc1c;
/* rgb */ color: rgb(102, 188, 28);
/* oklch */ color: oklch(71.3% 0.199 135.0);

Tailwind

colors: {
  custom: {
    50: '#9ad16a',
    500: '#66bc1c',
    950: '#000000',
  },
}

SCSS

$custom: #66bc1c;
$custom-light: #9ad16a;
$custom-dark: #000000;

JSON

{
  "hex": "#66bc1c",
  "rgb": {
    "r": 102,
    "g": 188,
    "b": 28
  },
  "hsl": {
    "h": 92.25,
    "s": 74.074,
    "l": 42.353
  },
  "oklch": {
    "l": 0.71312,
    "c": 0.19948,
    "h": 135
  },
  "luminance": 0.38875
}

Semantic roles & 50–950 ramp

primary

#66BC1C

secondary

#9E65CE

accent

#37F19B

background

#FAFCF6

surface

#F3F9EC

border

#CDD2C7

text

#0F1407

muted

#7F827A

Preview Lab

Preview with #66BC1C

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

Preview Lab → · Contrast checker → · Palette generator →