#181D5B#181D5B

#181D5B is a dark, moderate blue. Relative luminance 0.018; OKLCH L 27.2% C 0.109 H 273.1°. Best body text is #FFFFFF at 15.38:1 contrast (WCAG AA passes).

Color values

HEX	#181D5B
RGB	rgb(24, 29, 91)
HSL	hsl(236, 58%, 23%)
HSV	hsv(236, 74%, 36%)
CMYK	cmyk(73.6%, 68.1%, 0%, 64.3%)
CIE-LAB	lab(14.56, 20.92, -37.87)
CIE-LCH	lch(14.56, 43.26, 298.92°)
OKLab	oklab(27.19% 0.0059 -0.1093)
OKLCH	oklch(27.19% 0.109 273.1)
XYZ	xyz(2.7037, 1.8280, 10.1059)
Luminance	0.0183 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181D5B #5B5618

analogous

#183F5B #181D5B #34185B

triadic

#181D5B #5B181D #1D5B18

tetradic

#181D5B #5B183F #5B5618 #185B34

square

#181D5B #5B183F #5B5618 #185B34

split-complementary

#181D5B #5B3418 #3F5B18

monochromatic

#060818 #0B0E2B #181D5B #252C8B #323CBC

Accessibility & contrast

On white

15.38

#181D5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.37

#181D5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181D5B

15.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181D5B	#FFFFFF	#000000	##FFFFFF
##181D5B	1.00	15.38	1.37	15.38
#FFFFFF	15.38	1.00	21.00	1.00
#000000	1.37	21.00	1.00	21.00
##FFFFFF	15.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00285D

Deuteranopia (green-blind)

#00225A

Tritanopia (blue-blind)

#002D39

Achromatopsia (no color)

#252525

Design tokens & code

CSS

--color: #181d5b;
/* rgb */ color: rgb(24, 29, 91);
/* oklch */ color: oklch(27.2% 0.109 273.1);

Tailwind

colors: {
  custom: {
    50: '#5f598a',
    500: '#181d5b',
    950: '#000000',
  },
}

SCSS

$custom: #181d5b;
$custom-light: #5f598a;
$custom-dark: #000000;

JSON

{
  "hex": "#181d5b",
  "rgb": {
    "r": 24,
    "g": 29,
    "b": 91
  },
  "hsl": {
    "h": 235.522,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.27185,
    "c": 0.10945,
    "h": 273.1
  },
  "luminance": 0.01828
}

Semantic roles & 50–950 ramp

primary

#181D5B

secondary

#928B3D

accent

#D646E1

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #181D5B

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

Preview Lab → · Contrast checker → · Palette generator →