#178B21#178B21

#178B21 is a mid, vivid green. Relative luminance 0.188; OKLCH L 55.6% C 0.172 H 143.7°. Best body text is #000000 at 4.75:1 contrast (WCAG AA passes).

Color values

HEX	#178B21
RGB	rgb(23, 139, 33)
HSL	hsl(125, 72%, 32%)
HSV	hsv(125, 83%, 55%)
CMYK	cmyk(83.5%, 0%, 76.3%, 45.5%)
CIE-LAB	lab(50.40, -51.27, 45.14)
CIE-LCH	lch(50.40, 68.31, 138.64°)
OKLab	oklab(55.57% -0.1387 0.102)
OKLCH	oklch(55.57% 0.172 143.7)
XYZ	xyz(9.8598, 18.7560, 4.5392)
Luminance	0.1876 (WCAG relative)
Temperature	neutral
Family	green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#178B21 #8B1781

analogous

#478B17 #178B21 #178B5B

triadic

#178B21 #21178B #8B2117

tetradic

#178B21 #17478B #8B1781 #8B5B17

square

#178B21 #17478B #8B1781 #8B5B17

split-complementary

#178B21 #5B178B #8B1747

monochromatic

#062208 #0E5615 #178B21 #20C02D #3DDF4B

Accessibility & contrast

On white

4.42

#178B21 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.75

#178B21 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #178B21

4.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##178B21	#FFFFFF	#000000	##000000
##178B21	1.00	4.42	4.75	4.75
#FFFFFF	4.42	1.00	21.00	21.00
#000000	4.75	21.00	1.00	1.00
##000000	4.75	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#8E7D0C

Deuteranopia (green-blind)

#82752D

Tritanopia (blue-blind)

#008777

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #178b21;
/* rgb */ color: rgb(23, 139, 33);
/* oklch */ color: oklch(55.6% 0.172 143.7);

Tailwind

colors: {
  custom: {
    50: '#6cae64',
    500: '#178b21',
    950: '#000000',
  },
}

SCSS

$custom: #178b21;
$custom-light: #6cae64;
$custom-dark: #000000;

JSON

{
  "hex": "#178b21",
  "rgb": {
    "r": 23,
    "g": 139,
    "b": 33
  },
  "hsl": {
    "h": 125.172,
    "s": 71.605,
    "l": 31.765
  },
  "oklch": {
    "l": 0.55565,
    "c": 0.17219,
    "h": 143.7
  },
  "luminance": 0.18757
}

Semantic roles & 50–950 ramp

primary

#178B21

secondary

#BF3FB4

accent

#39DFEE

background

#F7FAF6

surface

#EDF4EB

border

#C8CEC6

text

#081006

muted

#7B7F7A

Preview Lab

Preview with #178B21

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

Preview Lab → · Contrast checker → · Palette generator →