#181D58#181D58

#181D58 is a dark, moderate blue. Relative luminance 0.018; OKLCH L 26.9% C 0.105 H 273.3°. Best body text is #FFFFFF at 15.49:1 contrast (WCAG AA passes).

Color values

HEX	#181D58
RGB	rgb(24, 29, 88)
HSL	hsl(235, 57%, 22%)
HSV	hsv(235, 73%, 35%)
CMYK	cmyk(72.7%, 67%, 0%, 65.5%)
CIE-LAB	lab(14.27, 19.72, -36.32)
CIE-LCH	lch(14.27, 41.33, 298.50°)
OKLab	oklab(26.89% 0.006 -0.1047)
OKLCH	oklch(26.89% 0.105 273.3)
XYZ	xyz(2.5769, 1.7773, 9.4379)
Luminance	0.0178 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181D58 #585318

analogous

#183D58 #181D58 #331858

triadic

#181D58 #58181D #1D5818

tetradic

#181D58 #58183D #585318 #185833

square

#181D58 #58183D #585318 #185833

split-complementary

#181D58 #583318 #3D5818

monochromatic

#070818 #0B0D28 #181D58 #252D88 #323DB8

Accessibility & contrast

On white

15.49

#181D58 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.36

#181D58 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181D58

15.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181D58	#FFFFFF	#000000	##FFFFFF
##181D58	1.00	15.49	1.36	15.49
#FFFFFF	15.49	1.00	21.00	1.00
#000000	1.36	21.00	1.00	21.00
##FFFFFF	15.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00275A

Deuteranopia (green-blind)

#002157

Tritanopia (blue-blind)

#002C37

Achromatopsia (no color)

#242424

Design tokens & code

CSS

--color: #181d58;
/* rgb */ color: rgb(24, 29, 88);
/* oklch */ color: oklch(26.9% 0.105 273.3);

Tailwind

colors: {
  custom: {
    50: '#5f5988',
    500: '#181d58',
    950: '#000000',
  },
}

SCSS

$custom: #181d58;
$custom-light: #5f5988;
$custom-dark: #000000;

JSON

{
  "hex": "#181d58",
  "rgb": {
    "r": 24,
    "g": 29,
    "b": 88
  },
  "hsl": {
    "h": 235.313,
    "s": 57.143,
    "l": 21.961
  },
  "oklch": {
    "l": 0.26887,
    "c": 0.10491,
    "h": 273.3
  },
  "luminance": 0.01778
}

Semantic roles & 50–950 ramp

primary

#181D58

secondary

#8F883D

accent

#D447E0

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030B

muted

#79787C

Preview Lab

Preview with #181D58

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

Preview Lab → · Contrast checker → · Palette generator →