#181D40#181D40

#181D40 is a very dark, moderate blue. Relative luminance 0.014; OKLCH L 24.7% C 0.066 H 274.4°. Best body text is #FFFFFF at 16.30:1 contrast (WCAG AA passes).

Color values

HEX	#181D40
RGB	rgb(24, 29, 64)
HSL	hsl(233, 45%, 17%)
HSV	hsv(233, 63%, 25%)
CMYK	cmyk(62.5%, 54.7%, 0%, 74.9%)
CIE-LAB	lab(12.24, 10.08, -23.10)
CIE-LCH	lch(12.24, 25.20, 293.57°)
OKLab	oklab(24.73% 0.0051 -0.0659)
OKLCH	oklch(24.73% 0.066 274.4)
XYZ	xyz(1.7412, 1.4430, 5.0363)
Luminance	0.0144 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181D40 #403B18

analogous

#183140 #181D40 #271840

triadic

#181D40 #40181D #1D4018

tetradic

#181D40 #401831 #403B18 #184027

square

#181D40 #401831 #403B18 #184027

split-complementary

#181D40 #402718 #314018

monochromatic

#080A16 #080A16 #181D40 #29316D #394599

Accessibility & contrast

On white

16.30

#181D40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.29

#181D40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181D40

16.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181D40	#FFFFFF	#000000	##FFFFFF
##181D40	1.00	16.30	1.29	16.30
#FFFFFF	16.30	1.00	21.00	1.00
#000000	1.29	21.00	1.00	21.00
##FFFFFF	16.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0C2241

Deuteranopia (green-blind)

#071E3F

Tritanopia (blue-blind)

#04252B

Achromatopsia (no color)

#202020

Design tokens & code

CSS

--color: #181d40;
/* rgb */ color: rgb(24, 29, 64);
/* oklch */ color: oklch(24.7% 0.066 274.4);

Tailwind

colors: {
  custom: {
    50: '#595875',
    500: '#181d40',
    950: '#000000',
  },
}

SCSS

$custom: #181d40;
$custom-light: #595875;
$custom-dark: #000000;

JSON

{
  "hex": "#181d40",
  "rgb": {
    "r": 24,
    "g": 29,
    "b": 64
  },
  "hsl": {
    "h": 232.5,
    "s": 45.455,
    "l": 17.255
  },
  "oklch": {
    "l": 0.24729,
    "c": 0.06608,
    "h": 274.4
  },
  "luminance": 0.01443
}

Semantic roles & 50–950 ramp

primary

#181D40

secondary

#776F3D

accent

#C553D5

background

#F5F5F7

surface

#E9E9ED

border

#C5C5C8

text

#040308

muted

#79787B

Preview Lab

Preview with #181D40

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

Preview Lab → · Contrast checker → · Palette generator →