#181D5A#181D5A

#181D5A is a dark, moderate blue. Relative luminance 0.018; OKLCH L 27.1% C 0.108 H 273.1°. Best body text is #FFFFFF at 15.42:1 contrast (WCAG AA passes).

Color values

HEX	#181D5A
RGB	rgb(24, 29, 90)
HSL	hsl(235, 58%, 22%)
HSV	hsv(235, 73%, 35%)
CMYK	cmyk(73.3%, 67.8%, 0%, 64.7%)
CIE-LAB	lab(14.46, 20.52, -37.35)
CIE-LCH	lch(14.46, 42.62, 298.78°)
OKLab	oklab(27.08% 0.0059 -0.1078)
OKLCH	oklch(27.08% 0.108 273.1)
XYZ	xyz(2.6609, 1.8109, 9.8802)
Luminance	0.0181 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181D5A #5A5518

analogous

#183E5A #181D5A #34185A

triadic

#181D5A #5A181D #1D5A18

tetradic

#181D5A #5A183E #5A5518 #185A34

square

#181D5A #5A183E #5A5518 #185A34

split-complementary

#181D5A #5A3418 #3E5A18

monochromatic

#060818 #0B0D2A #181D5A #252D8A #323CBB

Accessibility & contrast

On white

15.42

#181D5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.36

#181D5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181D5A

15.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181D5A	#FFFFFF	#000000	##FFFFFF
##181D5A	1.00	15.42	1.36	15.42
#FFFFFF	15.42	1.00	21.00	1.00
#000000	1.36	21.00	1.00	21.00
##FFFFFF	15.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00285C

Deuteranopia (green-blind)

#002259

Tritanopia (blue-blind)

#002D38

Achromatopsia (no color)

#252525

Design tokens & code

CSS

--color: #181d5a;
/* rgb */ color: rgb(24, 29, 90);
/* oklch */ color: oklch(27.1% 0.108 273.1);

Tailwind

colors: {
  custom: {
    50: '#5f5989',
    500: '#181d5a',
    950: '#000000',
  },
}

SCSS

$custom: #181d5a;
$custom-light: #5f5989;
$custom-dark: #000000;

JSON

{
  "hex": "#181d5a",
  "rgb": {
    "r": 24,
    "g": 29,
    "b": 90
  },
  "hsl": {
    "h": 235.455,
    "s": 57.895,
    "l": 22.353
  },
  "oklch": {
    "l": 0.27085,
    "c": 0.10794,
    "h": 273.1
  },
  "luminance": 0.01811
}

Semantic roles & 50–950 ramp

primary

#181D5A

secondary

#918A3D

accent

#D547E1

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #181D5A

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

Preview Lab → · Contrast checker → · Palette generator →