#51AC21#51AC21

#51AC21 is a light, vivid yellow-green. Relative luminance 0.314; OKLCH L 66.3% C 0.189 H 137.6°. Best body text is #000000 at 7.27:1 contrast (WCAG AA passes).

Color values

HEX	#51AC21
RGB	rgb(81, 172, 33)
HSL	hsl(99, 68%, 40%)
HSV	hsv(99, 81%, 67%)
CMYK	cmyk(52.9%, 0%, 80.8%, 32.5%)
CIE-LAB	lab(62.81, -50.36, 57.63)
CIE-LCH	lch(62.81, 76.54, 131.15°)
OKLab	oklab(66.27% -0.1396 0.1275)
OKLCH	oklch(66.27% 0.189 137.6)
XYZ	xyz(18.4198, 31.3628, 6.5215)
Luminance	0.3136 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51AC21 #7C21AC

analogous

#96AC21 #51AC21 #21AC37

triadic

#51AC21 #2151AC #AC2151

tetradic

#51AC21 #2196AC #7C21AC #AC3721

square

#51AC21 #2196AC #7C21AC #AC3721

split-complementary

#51AC21 #3721AC #AC2196

monochromatic

#21450D #397917 #51AC21 #6CD832 #91E266

Accessibility & contrast

On white

2.89

#51AC21 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.27

#51AC21 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51AC21

7.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51AC21	#FFFFFF	#000000	##000000
##51AC21	1.00	2.89	7.27	7.27
#FFFFFF	2.89	1.00	21.00	21.00
#000000	7.27	21.00	1.00	1.00
##000000	7.27	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B29D00

Deuteranopia (green-blind)

#A69532

Tritanopia (blue-blind)

#4AA693

Achromatopsia (no color)

#989898

Design tokens & code

CSS

--color: #51ac21;
/* rgb */ color: rgb(81, 172, 33);
/* oklch */ color: oklch(66.3% 0.189 137.6);

Tailwind

colors: {
  custom: {
    50: '#8bc569',
    500: '#51ac21',
    950: '#000000',
  },
}

SCSS

$custom: #51ac21;
$custom-light: #8bc569;
$custom-dark: #000000;

JSON

{
  "hex": "#51ac21",
  "rgb": {
    "r": 81,
    "g": 172,
    "b": 33
  },
  "hsl": {
    "h": 99.281,
    "s": 67.805,
    "l": 40.196
  },
  "oklch": {
    "l": 0.66275,
    "c": 0.18912,
    "h": 137.6
  },
  "luminance": 0.31364
}

Semantic roles & 50–950 ramp

primary

#51AC21

secondary

#A462C7

accent

#3DEBAF

background

#F9FCF6

surface

#F1F8EB

border

#CBD1C6

text

#0D1307

muted

#7E827A

Preview Lab

Preview with #51AC21

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

Preview Lab → · Contrast checker → · Palette generator →