#181C5B#181C5B

#181C5B is a dark, moderate blue. Relative luminance 0.018; OKLCH L 27.0% C 0.111 H 273.5°. Best body text is #FFFFFF at 15.49:1 contrast (WCAG AA passes).

Color values

HEX	#181C5B
RGB	rgb(24, 28, 91)
HSL	hsl(236, 58%, 23%)
HSV	hsv(236, 74%, 36%)
CMYK	cmyk(73.6%, 69.2%, 0%, 64.3%)
CIE-LAB	lab(14.29, 21.63, -38.31)
CIE-LCH	lch(14.29, 44.00, 299.45°)
OKLab	oklab(26.99% 0.0067 -0.1106)
OKLCH	oklch(26.99% 0.111 273.5)
XYZ	xyz(2.6796, 1.7798, 10.0978)
Luminance	0.0178 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181C5B #5B5718

analogous

#183D5B #181C5B #36185B

triadic

#181C5B #5B181C #1C5B18

tetradic

#181C5B #5B183D #5B5718 #185B36

square

#181C5B #5B183D #5B5718 #185B36

split-complementary

#181C5B #5B3618 #3D5B18

monochromatic

#060718 #0B0D2B #181C5B #252B8B #323ABC

Accessibility & contrast

On white

15.49

#181C5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.36

#181C5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181C5B

15.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181C5B	#FFFFFF	#000000	##FFFFFF
##181C5B	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)

#00275D

Deuteranopia (green-blind)

#00215A

Tritanopia (blue-blind)

#002C38

Achromatopsia (no color)

#242424

Design tokens & code

CSS

--color: #181c5b;
/* rgb */ color: rgb(24, 28, 91);
/* oklch */ color: oklch(27.0% 0.111 273.5);

Tailwind

colors: {
  custom: {
    50: '#5f588a',
    500: '#181c5b',
    950: '#000000',
  },
}

SCSS

$custom: #181c5b;
$custom-light: #5f588a;
$custom-dark: #000000;

JSON

{
  "hex": "#181c5b",
  "rgb": {
    "r": 24,
    "g": 28,
    "b": 91
  },
  "hsl": {
    "h": 236.418,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.26987,
    "c": 0.11079,
    "h": 273.5
  },
  "luminance": 0.0178
}

Semantic roles & 50–950 ramp

primary

#181C5B

secondary

#928D3D

accent

#D846E1

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #181C5B

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

Preview Lab → · Contrast checker → · Palette generator →