#181B5A#181B5A

#181B5A is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.7% C 0.111 H 274.0°. Best body text is #FFFFFF at 15.63:1 contrast (WCAG AA passes).

Color values

HEX	#181B5A
RGB	rgb(24, 27, 90)
HSL	hsl(237, 58%, 22%)
HSV	hsv(237, 73%, 35%)
CMYK	cmyk(73.3%, 70%, 0%, 64.7%)
CIE-LAB	lab(13.92, 21.95, -38.24)
CIE-LCH	lch(13.92, 44.09, 299.85°)
OKLab	oklab(26.69% 0.0076 -0.1104)
OKLCH	oklch(26.69% 0.111 274)
XYZ	xyz(2.6135, 1.7160, 9.8644)
Luminance	0.0172 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B5A #5A5718

analogous

#183C5A #181B5A #36185A

triadic

#181B5A #5A181B #1B5A18

tetradic

#181B5A #5A183C #5A5718 #185A36

square

#181B5A #5A183C #5A5718 #185A36

split-complementary

#181B5A #5A3618 #3C5A18

monochromatic

#060718 #0B0D2A #181B5A #25298A #3238BB

Accessibility & contrast

On white

15.63

#181B5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.34

#181B5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B5A

15.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B5A	#FFFFFF	#000000	##FFFFFF
##181B5A	1.00	15.63	1.34	15.63
#FFFFFF	15.63	1.00	21.00	1.00
#000000	1.34	21.00	1.00	21.00
##FFFFFF	15.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00265C

Deuteranopia (green-blind)

#002059

Tritanopia (blue-blind)

#002B37

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #181b5a;
/* rgb */ color: rgb(24, 27, 90);
/* oklch */ color: oklch(26.7% 0.111 274.0);

Tailwind

colors: {
  custom: {
    50: '#5f5789',
    500: '#181b5a',
    950: '#000000',
  },
}

SCSS

$custom: #181b5a;
$custom-light: #5f5789;
$custom-dark: #000000;

JSON

{
  "hex": "#181b5a",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 90
  },
  "hsl": {
    "h": 237.273,
    "s": 57.895,
    "l": 22.353
  },
  "oklch": {
    "l": 0.26689,
    "c": 0.11065,
    "h": 274
  },
  "luminance": 0.01716
}

Semantic roles & 50–950 ramp

primary

#181B5A

secondary

#918D3D

accent

#DA47E1

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #181B5A

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

Preview Lab → · Contrast checker → · Palette generator →