#51B421#51B421

#51B421 is a light, vivid green. Relative luminance 0.345; OKLCH L 68.4% C 0.198 H 138.1°. Best body text is #000000 at 7.90:1 contrast (WCAG AA passes).

Color values

HEX	#51B421
RGB	rgb(81, 180, 33)
HSL	hsl(100, 69%, 42%)
HSV	hsv(100, 82%, 71%)
CMYK	cmyk(55%, 0%, 81.7%, 29.4%)
CIE-LAB	lab(65.36, -53.34, 59.98)
CIE-LCH	lch(65.36, 80.27, 131.65°)
OKLab	oklab(68.37% -0.1476 0.1325)
OKLCH	oklch(68.37% 0.198 138.1)
XYZ	xyz(19.9884, 34.5000, 7.0444)
Luminance	0.3450 (WCAG relative)
Temperature	warm
Family	green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B421 #8421B4

analogous

#9BB421 #51B421 #21B43B

triadic

#51B421 #2151B4 #B42151

tetradic

#51B421 #219BB4 #8421B4 #B43B21

square

#51B421 #219BB4 #8421B4 #B43B21

split-complementary

#51B421 #3B21B4 #B4219B

monochromatic

#224D0E #3A8018 #51B421 #6DDA38 #93E46B

Accessibility & contrast

On white

2.66

#51B421 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.90

#51B421 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B421

7.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B421	#FFFFFF	#000000	##000000
##51B421	1.00	2.66	7.90	7.90
#FFFFFF	2.66	1.00	21.00	21.00
#000000	7.90	21.00	1.00	1.00
##000000	7.90	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#BAA400

Deuteranopia (green-blind)

#AD9C33

Tritanopia (blue-blind)

#48AE99

Achromatopsia (no color)

#9F9F9F

Design tokens & code

CSS

--color: #51b421;
/* rgb */ color: rgb(81, 180, 33);
/* oklch */ color: oklch(68.4% 0.198 138.1);

Tailwind

colors: {
  custom: {
    50: '#8dcb6a',
    500: '#51b421',
    950: '#000000',
  },
}

SCSS

$custom: #51b421;
$custom-light: #8dcb6a;
$custom-dark: #000000;

JSON

{
  "hex": "#51b421",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 33
  },
  "hsl": {
    "h": 100.408,
    "s": 69.014,
    "l": 41.765
  },
  "oklch": {
    "l": 0.68374,
    "c": 0.19835,
    "h": 138.1
  },
  "luminance": 0.34502
}

Semantic roles & 50–950 ramp

primary

#51B421

secondary

#AA67CA

accent

#3CECB2

background

#F9FCF6

surface

#F1F9EC

border

#CBD2C7

text

#0D1307

muted

#7E827A

Preview Lab

Preview with #51B421

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

Preview Lab → · Contrast checker → · Palette generator →