#51B41B#51B41B

#51B41B is a light, highly saturated yellow-green. Relative luminance 0.345; OKLCH L 68.3% C 0.201 H 137.8°. Best body text is #000000 at 7.89:1 contrast (WCAG AA passes).

Color values

HEX	#51B41B
RGB	rgb(81, 180, 27)
HSL	hsl(99, 74%, 41%)
HSV	hsv(99, 85%, 71%)
CMYK	cmyk(55%, 0%, 85%, 29.4%)
CIE-LAB	lab(65.33, -53.62, 61.50)
CIE-LCH	lch(65.33, 81.60, 131.08°)
OKLab	oklab(68.35% -0.1487 0.1348)
OKLCH	oklch(68.35% 0.201 137.8)
XYZ	xyz(19.9117, 34.4694, 6.6407)
Luminance	0.3447 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B41B #7E1BB4

analogous

#9DB41B #51B41B #1BB432

triadic

#51B41B #1B51B4 #B41B51

tetradic

#51B41B #1B9DB4 #7E1BB4 #B4321B

square

#51B41B #1B9DB4 #7E1BB4 #B4321B

split-complementary

#51B41B #321BB4 #B41B9D

monochromatic

#214A0B #397F13 #51B41B #6CDF2D #91E762

Accessibility & contrast

On white

2.66

#51B41B on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.89

#51B41B on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B41B

7.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B41B	#FFFFFF	#000000	##000000
##51B41B	1.00	2.66	7.89	7.89
#FFFFFF	2.66	1.00	21.00	21.00
#000000	7.89	21.00	1.00	1.00
##000000	7.89	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#BAA400

Deuteranopia (green-blind)

#AD9C30

Tritanopia (blue-blind)

#49AD99

Achromatopsia (no color)

#9F9F9F

Design tokens & code

CSS

--color: #51b41b;
/* rgb */ color: rgb(81, 180, 27);
/* oklch */ color: oklch(68.3% 0.201 137.8);

Tailwind

colors: {
  custom: {
    50: '#8dcb68',
    500: '#51b41b',
    950: '#000000',
  },
}

SCSS

$custom: #51b41b;
$custom-light: #8dcb68;
$custom-dark: #000000;

JSON

{
  "hex": "#51b41b",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 27
  },
  "hsl": {
    "h": 98.824,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.68347,
    "c": 0.2007,
    "h": 137.8
  },
  "luminance": 0.34471
}

Semantic roles & 50–950 ramp

primary

#51B41B

secondary

#A55FCC

accent

#37F1AF

background

#F9FCF6

surface

#F1F9EB

border

#CBD2C6

text

#0D1307

muted

#7E827A

Preview Lab

Preview with #51B41B

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

Preview Lab → · Contrast checker → · Palette generator →