#18183B#18183B

#18183B is a very dark, moderate blue. Relative luminance 0.012; OKLCH L 23.1% C 0.066 H 279.9°. Best body text is #FFFFFF at 17.04:1 contrast (WCAG AA passes).

Color values

HEX	#18183B
RGB	rgb(24, 24, 59)
HSL	hsl(240, 42%, 16%)
HSV	hsv(240, 59%, 23%)
CMYK	cmyk(59.3%, 59.3%, 0%, 76.9%)
CIE-LAB	lab(10.28, 11.92, -22.70)
CIE-LCH	lch(10.28, 25.64, 297.70°)
OKLab	oklab(23.13% 0.0114 -0.0648)
OKLCH	oklch(23.13% 0.066 279.9)
XYZ	xyz(1.4925, 1.1631, 4.2827)
Luminance	0.0116 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#18183B #3B3B18

analogous

#182A3B #18183B #2A183B

triadic

#18183B #3B1818 #183B18

tetradic

#18183B #3B182A #3B3B18 #183B2A

square

#18183B #3B182A #3B3B18 #183B2A

split-complementary

#18183B #3B2A18 #2A3B18

monochromatic

#090916 #090916 #18183B #2A2A67 #3B3B92

Accessibility & contrast

On white

17.04

#18183B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.23

#18183B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #18183B

17.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##18183B	#FFFFFF	#000000	##FFFFFF
##18183B	1.00	17.04	1.23	17.04
#FFFFFF	17.04	1.00	21.00	1.00
#000000	1.23	21.00	1.00	21.00
##FFFFFF	17.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#071D3C

Deuteranopia (green-blind)

#041B3A

Tritanopia (blue-blind)

#0A2026

Achromatopsia (no color)

#1C1C1C

Design tokens & code

CSS

--color: #18183b;
/* rgb */ color: rgb(24, 24, 59);
/* oklch */ color: oklch(23.1% 0.066 279.9);

Tailwind

colors: {
  custom: {
    50: '#585471',
    500: '#18183b',
    950: '#000000',
  },
}

SCSS

$custom: #18183b;
$custom-light: #585471;
$custom-dark: #000000;

JSON

{
  "hex": "#18183b",
  "rgb": {
    "r": 24,
    "g": 24,
    "b": 59
  },
  "hsl": {
    "h": 240,
    "s": 42.169,
    "l": 16.275
  },
  "oklch": {
    "l": 0.23129,
    "c": 0.06575,
    "h": 279.9
  },
  "luminance": 0.01163
}

Semantic roles & 50–950 ramp

primary

#18183B

secondary

#71713E

accent

#D256D2

background

#F5F4F6

surface

#E9E7EC

border

#C5C3C7

text

#030207

muted

#78787A

Preview Lab

Preview with #18183B

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

Preview Lab → · Contrast checker → · Palette generator →