#18173B#18173B

#18173B is a very dark, moderate blue. Relative luminance 0.011; OKLCH L 22.9% C 0.067 H 280.9°. Best body text is #FFFFFF at 17.15:1 contrast (WCAG AA passes).

Color values

HEX	#18173B
RGB	rgb(24, 23, 59)
HSL	hsl(242, 44%, 16%)
HSV	hsv(242, 61%, 23%)
CMYK	cmyk(59.3%, 61%, 0%, 76.9%)
CIE-LAB	lab(9.97, 12.68, -23.20)
CIE-LCH	lch(9.97, 26.44, 298.66°)
OKLab	oklab(22.9% 0.0127 -0.0662)
OKLCH	oklch(22.9% 0.067 280.9)
XYZ	xyz(1.4723, 1.1227, 4.2759)
Luminance	0.0112 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#18173B #3A3B17

analogous

#17283B #18173B #2A173B

triadic

#18173B #3B1817 #173B18

tetradic

#18173B #3B1728 #3A3B17 #173B2A

square

#18173B #3B1728 #3A3B17 #173B2A

split-complementary

#18173B #3B2A17 #283B17

monochromatic

#090916 #090916 #18173B #2A2867 #3C3993

Accessibility & contrast

On white

17.15

#18173B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.22

#18173B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #18173B

17.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##18173B	#FFFFFF	#000000	##FFFFFF
##18173B	1.00	17.15	1.22	17.15
#FFFFFF	17.15	1.00	21.00	1.00
#000000	1.22	21.00	1.00	21.00
##FFFFFF	17.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#051D3C

Deuteranopia (green-blind)

#031A3A

Tritanopia (blue-blind)

#0A1F26

Achromatopsia (no color)

#1B1B1B

Design tokens & code

CSS

--color: #18173b;
/* rgb */ color: rgb(24, 23, 59);
/* oklch */ color: oklch(22.9% 0.067 280.9);

Tailwind

colors: {
  custom: {
    50: '#585371',
    500: '#18173b',
    950: '#000000',
  },
}

SCSS

$custom: #18173b;
$custom-light: #585371;
$custom-dark: #000000;

JSON

{
  "hex": "#18173b",
  "rgb": {
    "r": 24,
    "g": 23,
    "b": 59
  },
  "hsl": {
    "h": 241.667,
    "s": 43.902,
    "l": 16.078
  },
  "oklch": {
    "l": 0.22898,
    "c": 0.06745,
    "h": 280.9
  },
  "luminance": 0.01123
}

Semantic roles & 50–950 ramp

primary

#18173B

secondary

#70723C

accent

#D454D0

background

#F5F4F6

surface

#E9E7EC

border

#C5C3C7

text

#030207

muted

#78787A

Preview Lab

Preview with #18173B

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

Preview Lab → · Contrast checker → · Palette generator →