#51AA21#51AA21

#51AA21 is a light, vivid yellow-green. Relative luminance 0.306; OKLCH L 65.7% C 0.187 H 137.5°. Best body text is #000000 at 7.12:1 contrast (WCAG AA passes).

Color values

HEX	#51AA21
RGB	rgb(81, 170, 33)
HSL	hsl(99, 67%, 40%)
HSV	hsv(99, 81%, 67%)
CMYK	cmyk(52.4%, 0%, 80.6%, 33.3%)
CIE-LAB	lab(62.17, -49.60, 57.04)
CIE-LCH	lch(62.17, 75.59, 131.01°)
OKLab	oklab(65.75% -0.1376 0.1263)
OKLCH	oklch(65.75% 0.187 137.5)
XYZ	xyz(18.0420, 30.6072, 6.3956)
Luminance	0.3061 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51AA21 #7A21AA

analogous

#96AA21 #51AA21 #21AA35

triadic

#51AA21 #2151AA #AA2151

tetradic

#51AA21 #2196AA #7A21AA #AA3521

square

#51AA21 #2196AA #7A21AA #AA3521

split-complementary

#51AA21 #3521AA #AA2196

monochromatic

#20430D #397717 #51AA21 #6BD731 #90E164

Accessibility & contrast

On white

2.95

#51AA21 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.12

#51AA21 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51AA21

7.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51AA21	#FFFFFF	#000000	##000000
##51AA21	1.00	2.95	7.12	7.12
#FFFFFF	2.95	1.00	21.00	21.00
#000000	7.12	21.00	1.00	1.00
##000000	7.12	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B09B00

Deuteranopia (green-blind)

#A49431

Tritanopia (blue-blind)

#4BA491

Achromatopsia (no color)

#969696

Design tokens & code

CSS

--color: #51aa21;
/* rgb */ color: rgb(81, 170, 33);
/* oklch */ color: oklch(65.7% 0.187 137.5);

Tailwind

colors: {
  custom: {
    50: '#8bc469',
    500: '#51aa21',
    950: '#000000',
  },
}

SCSS

$custom: #51aa21;
$custom-light: #8bc469;
$custom-dark: #000000;

JSON

{
  "hex": "#51aa21",
  "rgb": {
    "r": 81,
    "g": 170,
    "b": 33
  },
  "hsl": {
    "h": 98.978,
    "s": 67.488,
    "l": 39.804
  },
  "oklch": {
    "l": 0.65749,
    "c": 0.18678,
    "h": 137.5
  },
  "luminance": 0.30609
}

Semantic roles & 50–950 ramp

primary

#51AA21

secondary

#A361C6

accent

#3DEAAE

background

#F9FCF6

surface

#F1F8EB

border

#CBD1C6

text

#0D1307

muted

#7E827A

Preview Lab

Preview with #51AA21

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

Preview Lab → · Contrast checker → · Palette generator →