#181B5C#181B5C

#181B5C is a dark, moderate blue. Relative luminance 0.018; OKLCH L 26.9% C 0.114 H 273.7°. Best body text is #FFFFFF at 15.55:1 contrast (WCAG AA passes).

Color values

HEX	#181B5C
RGB	rgb(24, 27, 92)
HSL	hsl(237, 59%, 23%)
HSV	hsv(237, 74%, 36%)
CMYK	cmyk(73.9%, 70.7%, 0%, 63.9%)
CIE-LAB	lab(14.12, 22.73, -39.25)
CIE-LCH	lch(14.12, 45.36, 300.07°)
OKLab	oklab(26.9% 0.0074 -0.1134)
OKLCH	oklch(26.9% 0.114 273.7)
XYZ	xyz(2.6997, 1.7505, 10.3187)
Luminance	0.0175 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B5C #5C5918

analogous

#183D5C #181B5C #37185C

triadic

#181B5C #5C181B #1B5C18

tetradic

#181B5C #5C183D #5C5918 #185C37

square

#181B5C #5C183D #5C5918 #185C37

split-complementary

#181B5C #5C3718 #3D5C18

monochromatic

#060718 #0B0D2B #181B5C #25298D #3137BD

Accessibility & contrast

On white

15.55

#181B5C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.35

#181B5C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B5C

15.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B5C	#FFFFFF	#000000	##FFFFFF
##181B5C	1.00	15.55	1.35	15.55
#FFFFFF	15.55	1.00	21.00	1.00
#000000	1.35	21.00	1.00	21.00
##FFFFFF	15.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00275E

Deuteranopia (green-blind)

#00215B

Tritanopia (blue-blind)

#002C38

Achromatopsia (no color)

#242424

Design tokens & code

CSS

--color: #181b5c;
/* rgb */ color: rgb(24, 27, 92);
/* oklch */ color: oklch(26.9% 0.114 273.7);

Tailwind

colors: {
  custom: {
    50: '#60578b',
    500: '#181b5c',
    950: '#000000',
  },
}

SCSS

$custom: #181b5c;
$custom-light: #60578b;
$custom-dark: #000000;

JSON

{
  "hex": "#181b5c",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 92
  },
  "hsl": {
    "h": 237.353,
    "s": 58.621,
    "l": 22.745
  },
  "oklch": {
    "l": 0.26896,
    "c": 0.1136,
    "h": 273.7
  },
  "luminance": 0.01751
}

Semantic roles & 50–950 ramp

primary

#181B5C

secondary

#938F3D

accent

#DB46E2

background

#F6F5F8

surface

#EBE9F0

border

#C6C5CB

text

#05030C

muted

#7A787D

Preview Lab

Preview with #181B5C

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

Preview Lab → · Contrast checker → · Palette generator →