#181D51#181D51

#181D51 is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.2% C 0.094 H 273.8°. Best body text is #FFFFFF at 15.75:1 contrast (WCAG AA passes).

Color values

HEX	#181D51
RGB	rgb(24, 29, 81)
HSL	hsl(235, 54%, 21%)
HSV	hsv(235, 70%, 32%)
CMYK	cmyk(70.4%, 64.2%, 0%, 68.2%)
CIE-LAB	lab(13.63, 16.92, -32.62)
CIE-LCH	lch(13.63, 36.75, 297.41°)
OKLab	oklab(26.21% 0.0062 -0.0939)
OKLCH	oklch(26.21% 0.094 273.8)
XYZ	xyz(2.3008, 1.6668, 7.9835)
Luminance	0.0167 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.94

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181D51 #514C18

analogous

#183951 #181D51 #2F1851

triadic

#181D51 #51181D #1D5118

tetradic

#181D51 #511839 #514C18 #18512F

square

#181D51 #511839 #514C18 #18512F

split-complementary

#181D51 #512F18 #395118

monochromatic

#070818 #0A0C22 #181D51 #262E80 #343FAF

Accessibility & contrast

On white

15.75

#181D51 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.33

#181D51 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181D51

15.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181D51	#FFFFFF	#000000	##FFFFFF
##181D51	1.00	15.75	1.33	15.75
#FFFFFF	15.75	1.00	21.00	1.00
#000000	1.33	21.00	1.00	21.00
##FFFFFF	15.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002553

Deuteranopia (green-blind)

#002050

Tritanopia (blue-blind)

#002A33

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #181d51;
/* rgb */ color: rgb(24, 29, 81);
/* oklch */ color: oklch(26.2% 0.094 273.8);

Tailwind

colors: {
  custom: {
    50: '#5d5882',
    500: '#181d51',
    950: '#000000',
  },
}

SCSS

$custom: #181d51;
$custom-light: #5d5882;
$custom-dark: #000000;

JSON

{
  "hex": "#181d51",
  "rgb": {
    "r": 24,
    "g": 29,
    "b": 81
  },
  "hsl": {
    "h": 234.737,
    "s": 54.286,
    "l": 20.588
  },
  "oklch": {
    "l": 0.26214,
    "c": 0.09409,
    "h": 273.8
  },
  "luminance": 0.01667
}

Semantic roles & 50–950 ramp

primary

#181D51

secondary

#88813D

accent

#D14ADE

background

#F5F5F8

surface

#E9E9EF

border

#C5C5CA

text

#05030A

muted

#79787C

Preview Lab

Preview with #181D51

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

Preview Lab → · Contrast checker → · Palette generator →