#66BC3A#66BC3A

#66BC3A is a light, vivid yellow-green. Relative luminance 0.391; OKLCH L 71.5% C 0.184 H 137.0°. Best body text is #000000 at 8.82:1 contrast (WCAG AA passes).

Color values

HEX	#66BC3A
RGB	rgb(102, 188, 58)
HSL	hsl(100, 53%, 48%)
HSV	hsv(100, 69%, 74%)
CMYK	cmyk(45.7%, 0%, 69.1%, 26.3%)
CIE-LAB	lab(68.82, -48.59, 55.20)
CIE-LCH	lch(68.82, 73.53, 131.36°)
OKLab	oklab(71.5% -0.1346 0.1257)
OKLCH	oklch(71.5% 0.184 137)
XYZ	xyz(24.2257, 39.0952, 10.2718)
Luminance	0.3910 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66BC3A #903ABC

analogous

#A7BC3A #66BC3A #3ABC4F

triadic

#66BC3A #3A66BC #BC3A66

tetradic

#66BC3A #3AA7BC #903ABC #BC4F3A

square

#66BC3A #3AA7BC #903ABC #BC4F3A

split-complementary

#66BC3A #4F3ABC #BC3AA7

monochromatic

#335E1D #4D8D2C #66BC3A #88CF64 #ACDE93

Accessibility & contrast

On white

2.38

#66BC3A on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.82

#66BC3A on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66BC3A

8.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66BC3A	#FFFFFF	#000000	##000000
##66BC3A	1.00	2.38	8.82	8.82
#FFFFFF	2.38	1.00	21.00	21.00
#000000	8.82	21.00	1.00	1.00
##000000	8.82	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#C2AC26

Deuteranopia (green-blind)

#B7A546

Tritanopia (blue-blind)

#61B5A2

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #66bc3a;
/* rgb */ color: rgb(102, 188, 58);
/* oklch */ color: oklch(71.5% 0.184 137.0);

Tailwind

colors: {
  custom: {
    50: '#99d177',
    500: '#66bc3a',
    950: '#000000',
  },
}

SCSS

$custom: #66bc3a;
$custom-light: #99d177;
$custom-dark: #000000;

JSON

{
  "hex": "#66bc3a",
  "rgb": {
    "r": 102,
    "g": 188,
    "b": 58
  },
  "hsl": {
    "h": 99.692,
    "s": 52.846,
    "l": 48.235
  },
  "oklch": {
    "l": 0.71495,
    "c": 0.18418,
    "h": 137
  },
  "luminance": 0.39097
}

Semantic roles & 50–950 ramp

primary

#66BC3A

secondary

#B389C9

accent

#4CDCAB

background

#F9FCF7

surface

#F2F9EE

border

#CCD2C9

text

#0E1409

muted

#7E827B

Preview Lab

Preview with #66BC3A

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

Preview Lab → · Contrast checker → · Palette generator →