#181F5B#181F5B

#181F5B is a dark, moderate blue. Relative luminance 0.019; OKLCH L 27.6% C 0.107 H 272.2°. Best body text is #FFFFFF at 15.15:1 contrast (WCAG AA passes).

Color values

HEX	#181F5B
RGB	rgb(24, 31, 91)
HSL	hsl(234, 58%, 23%)
HSV	hsv(234, 74%, 36%)
CMYK	cmyk(73.6%, 65.9%, 0%, 64.3%)
CIE-LAB	lab(15.11, 19.48, -36.96)
CIE-LCH	lch(15.11, 41.78, 297.79°)
OKLab	oklab(27.59% 0.0041 -0.1066)
OKLCH	oklch(27.59% 0.107 272.2)
XYZ	xyz(2.7544, 1.9292, 10.1227)
Luminance	0.0193 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181F5B #5B5418

analogous

#18415B #181F5B #32185B

triadic

#181F5B #5B181F #1F5B18

tetradic

#181F5B #5B1841 #5B5418 #185B32

square

#181F5B #5B1841 #5B5418 #185B32

split-complementary

#181F5B #5B3218 #415B18

monochromatic

#060818 #0B0F2B #181F5B #252F8B #3240BC

Accessibility & contrast

On white

15.15

#181F5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.39

#181F5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181F5B

15.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181F5B	#FFFFFF	#000000	##FFFFFF
##181F5B	1.00	15.15	1.39	15.15
#FFFFFF	15.15	1.00	21.00	1.00
#000000	1.39	21.00	1.00	21.00
##FFFFFF	15.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00295D

Deuteranopia (green-blind)

#00235A

Tritanopia (blue-blind)

#002E39

Achromatopsia (no color)

#262626

Design tokens & code

CSS

--color: #181f5b;
/* rgb */ color: rgb(24, 31, 91);
/* oklch */ color: oklch(27.6% 0.107 272.2);

Tailwind

colors: {
  custom: {
    50: '#5f5a8a',
    500: '#181f5b',
    950: '#000000',
  },
}

SCSS

$custom: #181f5b;
$custom-light: #5f5a8a;
$custom-dark: #000000;

JSON

{
  "hex": "#181f5b",
  "rgb": {
    "r": 24,
    "g": 31,
    "b": 91
  },
  "hsl": {
    "h": 233.731,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.27593,
    "c": 0.10669,
    "h": 272.2
  },
  "luminance": 0.01929
}

Semantic roles & 50–950 ramp

primary

#181F5B

secondary

#92893D

accent

#D146E1

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #181F5B

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

Preview Lab → · Contrast checker → · Palette generator →