#181B5B#181B5B

#181B5B is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.8% C 0.112 H 273.9°. Best body text is #FFFFFF at 15.59:1 contrast (WCAG AA passes).

Color values

HEX	#181B5B
RGB	rgb(24, 27, 91)
HSL	hsl(237, 58%, 23%)
HSV	hsv(237, 74%, 36%)
CMYK	cmyk(73.6%, 70.3%, 0%, 64.3%)
CIE-LAB	lab(14.02, 22.34, -38.75)
CIE-LCH	lch(14.02, 44.73, 299.97°)
OKLab	oklab(26.79% 0.0075 -0.1119)
OKLCH	oklch(26.79% 0.112 273.9)
XYZ	xyz(2.6563, 1.7331, 10.0900)
Luminance	0.0173 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B5B #5B5818

analogous

#183D5B #181B5B #36185B

triadic

#181B5B #5B181B #1B5B18

tetradic

#181B5B #5B183D #5B5818 #185B36

square

#181B5B #5B183D #5B5818 #185B36

split-complementary

#181B5B #5B3618 #3D5B18

monochromatic

#060718 #0B0D2B #181B5B #25298B #3238BC

Accessibility & contrast

On white

15.59

#181B5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.35

#181B5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B5B

15.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B5B	#FFFFFF	#000000	##FFFFFF
##181B5B	1.00	15.59	1.35	15.59
#FFFFFF	15.59	1.00	21.00	1.00
#000000	1.35	21.00	1.00	21.00
##FFFFFF	15.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00275D

Deuteranopia (green-blind)

#00215A

Tritanopia (blue-blind)

#002C38

Achromatopsia (no color)

#242424

Design tokens & code

CSS

--color: #181b5b;
/* rgb */ color: rgb(24, 27, 91);
/* oklch */ color: oklch(26.8% 0.112 273.9);

Tailwind

colors: {
  custom: {
    50: '#60578a',
    500: '#181b5b',
    950: '#000000',
  },
}

SCSS

$custom: #181b5b;
$custom-light: #60578a;
$custom-dark: #000000;

JSON

{
  "hex": "#181b5b",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 91
  },
  "hsl": {
    "h": 237.313,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.26792,
    "c": 0.11213,
    "h": 273.9
  },
  "luminance": 0.01733
}

Semantic roles & 50–950 ramp

primary

#181B5B

secondary

#928E3D

accent

#DB46E1

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #181B5B

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

Preview Lab → · Contrast checker → · Palette generator →