#51B221#51B221

#51B221 is a light, vivid green. Relative luminance 0.337; OKLCH L 67.8% C 0.196 H 138.0°. Best body text is #000000 at 7.74:1 contrast (WCAG AA passes).

Color values

HEX	#51B221
RGB	rgb(81, 178, 33)
HSL	hsl(100, 69%, 41%)
HSV	hsv(100, 81%, 70%)
CMYK	cmyk(54.5%, 0%, 81.5%, 30.2%)
CIE-LAB	lab(64.72, -52.60, 59.40)
CIE-LCH	lch(64.72, 79.34, 131.53°)
OKLab	oklab(67.85% -0.1457 0.1312)
OKLCH	oklch(67.85% 0.196 138)
XYZ	xyz(19.5876, 33.6984, 6.9108)
Luminance	0.3370 (WCAG relative)
Temperature	warm
Family	green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B221 #8221B2

analogous

#9AB221 #51B221 #21B23A

triadic

#51B221 #2151B2 #B22151

tetradic

#51B221 #219AB2 #8221B2 #B23A21

square

#51B221 #219AB2 #8221B2 #B23A21

split-complementary

#51B221 #3A21B2 #B2219A

monochromatic

#224B0E #3A7E17 #51B221 #6CDA36 #92E36A

Accessibility & contrast

On white

2.71

#51B221 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.74

#51B221 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B221

7.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B221	#FFFFFF	#000000	##000000
##51B221	1.00	2.71	7.74	7.74
#FFFFFF	2.71	1.00	21.00	21.00
#000000	7.74	21.00	1.00	1.00
##000000	7.74	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B8A200

Deuteranopia (green-blind)

#AC9A33

Tritanopia (blue-blind)

#49AC98

Achromatopsia (no color)

#9D9D9D

Design tokens & code

CSS

--color: #51b221;
/* rgb */ color: rgb(81, 178, 33);
/* oklch */ color: oklch(67.8% 0.196 138.0);

Tailwind

colors: {
  custom: {
    50: '#8cca6a',
    500: '#51b221',
    950: '#000000',
  },
}

SCSS

$custom: #51b221;
$custom-light: #8cca6a;
$custom-dark: #000000;

JSON

{
  "hex": "#51b221",
  "rgb": {
    "r": 81,
    "g": 178,
    "b": 33
  },
  "hsl": {
    "h": 100.138,
    "s": 68.72,
    "l": 41.373
  },
  "oklch": {
    "l": 0.6785,
    "c": 0.19606,
    "h": 138
  },
  "luminance": 0.337
}

Semantic roles & 50–950 ramp

primary

#51B221

secondary

#A866C9

accent

#3CECB2

background

#F9FCF6

surface

#F1F8EC

border

#CBD1C7

text

#0D1307

muted

#7E827A

Preview Lab

Preview with #51B221

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

Preview Lab → · Contrast checker → · Palette generator →