#181B57#181B57

#181B57 is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.4% C 0.106 H 274.3°. Best body text is #FFFFFF at 15.75:1 contrast (WCAG AA passes).

Color values

HEX	#181B57
RGB	rgb(24, 27, 87)
HSL	hsl(237, 57%, 22%)
HSV	hsv(237, 72%, 34%)
CMYK	cmyk(72.4%, 69%, 0%, 65.9%)
CIE-LAB	lab(13.63, 20.77, -36.70)
CIE-LCH	lch(13.63, 42.17, 299.50°)
OKLab	oklab(26.38% 0.0079 -0.1059)
OKLCH	oklch(26.38% 0.106 274.3)
XYZ	xyz(2.4884, 1.6660, 9.2054)
Luminance	0.0167 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B57 #575418

analogous

#183B57 #181B57 #351857

triadic

#181B57 #57181B #1B5718

tetradic

#181B57 #57183B #575418 #185735

square

#181B57 #57183B #575418 #185735

split-complementary

#181B57 #573518 #3B5718

monochromatic

#070718 #0B0C27 #181B57 #252A87 #3239B7

Accessibility & contrast

On white

15.75

#181B57 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.33

#181B57 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B57

15.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B57	#FFFFFF	#000000	##FFFFFF
##181B57	1.00	15.75	1.33	15.75
#FFFFFF	15.75	1.00	21.00	1.00
#000000	1.33	21.00	1.00	21.00
##FFFFFF	15.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002659

Deuteranopia (green-blind)

#002056

Tritanopia (blue-blind)

#002A36

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #181b57;
/* rgb */ color: rgb(24, 27, 87);
/* oklch */ color: oklch(26.4% 0.106 274.3);

Tailwind

colors: {
  custom: {
    50: '#5f5787',
    500: '#181b57',
    950: '#000000',
  },
}

SCSS

$custom: #181b57;
$custom-light: #5f5787;
$custom-dark: #000000;

JSON

{
  "hex": "#181b57",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 87
  },
  "hsl": {
    "h": 237.143,
    "s": 56.757,
    "l": 21.765
  },
  "oklch": {
    "l": 0.26384,
    "c": 0.10616,
    "h": 274.3
  },
  "luminance": 0.01666
}

Semantic roles & 50–950 ramp

primary

#181B57

secondary

#8E8A3D

accent

#D948E0

background

#F5F5F8

surface

#EAE9EF

border

#C6C5CA

text

#05030B

muted

#79787C

Preview Lab

Preview with #181B57

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

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