#181B58#181B58

#181B58 is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.5% C 0.108 H 274.2°. Best body text is #FFFFFF at 15.71:1 contrast (WCAG AA passes).

Color values

HEX	#181B58
RGB	rgb(24, 27, 88)
HSL	hsl(237, 57%, 22%)
HSV	hsv(237, 73%, 35%)
CMYK	cmyk(72.7%, 69.3%, 0%, 65.5%)
CIE-LAB	lab(13.72, 21.16, -37.22)
CIE-LCH	lch(13.72, 42.81, 299.62°)
OKLab	oklab(26.48% 0.0078 -0.1074)
OKLCH	oklch(26.48% 0.108 274.2)
XYZ	xyz(2.5295, 1.6824, 9.4221)
Luminance	0.0168 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B58 #585518

analogous

#183B58 #181B58 #351858

triadic

#181B58 #58181B #1B5818

tetradic

#181B58 #58183B #585518 #185835

square

#181B58 #58183B #585518 #185835

split-complementary

#181B58 #583518 #3B5818

monochromatic

#070718 #0B0C28 #181B58 #252A88 #3239B8

Accessibility & contrast

On white

15.71

#181B58 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.34

#181B58 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B58

15.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B58	#FFFFFF	#000000	##FFFFFF
##181B58	1.00	15.71	1.34	15.71
#FFFFFF	15.71	1.00	21.00	1.00
#000000	1.34	21.00	1.00	21.00
##FFFFFF	15.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00265A

Deuteranopia (green-blind)

#002057

Tritanopia (blue-blind)

#002B36

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #181b58;
/* rgb */ color: rgb(24, 27, 88);
/* oklch */ color: oklch(26.5% 0.108 274.2);

Tailwind

colors: {
  custom: {
    50: '#5f5788',
    500: '#181b58',
    950: '#000000',
  },
}

SCSS

$custom: #181b58;
$custom-light: #5f5788;
$custom-dark: #000000;

JSON

{
  "hex": "#181b58",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 88
  },
  "hsl": {
    "h": 237.188,
    "s": 57.143,
    "l": 21.961
  },
  "oklch": {
    "l": 0.26485,
    "c": 0.10767,
    "h": 274.2
  },
  "luminance": 0.01683
}

Semantic roles & 50–950 ramp

primary

#181B58

secondary

#8F8B3D

accent

#D947E0

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030B

muted

#79787C

Preview Lab

Preview with #181B58

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

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