#183B71#183B71

#183B71 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 35.9% C 0.102 H 259.0°. Best body text is #FFFFFF at 11.04:1 contrast (WCAG AA passes).

Color values

HEX	#183B71
RGB	rgb(24, 59, 113)
HSL	hsl(216, 65%, 27%)
HSV	hsv(216, 79%, 44%)
CMYK	cmyk(78.8%, 47.8%, 0%, 55.7%)
CIE-LAB	lab(25.30, 8.32, -34.84)
CIE-LCH	lch(25.30, 35.82, 283.43°)
OKLab	oklab(35.86% -0.0195 -0.0999)
OKLCH	oklch(35.86% 0.102 259)
XYZ	xyz(4.9202, 4.5138, 16.2315)
Luminance	0.0451 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B71 #714E18

analogous

#186871 #183B71 #211871

triadic

#183B71 #71183B #3B7118

tetradic

#183B71 #711868 #714E18 #187121

square

#183B71 #711868 #714E18 #187121

split-complementary

#183B71 #712118 #687118

monochromatic

#050D19 #0D213F #183B71 #2355A3 #3070D3

Accessibility & contrast

On white

11.04

#183B71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#183B71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B71

11.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B71	#FFFFFF	#000000	##FFFFFF
##183B71	1.00	11.04	1.90	11.04
#FFFFFF	11.04	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F4073

Deuteranopia (green-blind)

#0B3870

Tritanopia (blue-blind)

#004850

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183b71;
/* rgb */ color: rgb(24, 59, 113);
/* oklch */ color: oklch(35.9% 0.102 259.0);

Tailwind

colors: {
  custom: {
    50: '#63709a',
    500: '#183b71',
    950: '#000000',
  },
}

SCSS

$custom: #183b71;
$custom-light: #63709a;
$custom-dark: #000000;

JSON

{
  "hex": "#183b71",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 113
  },
  "hsl": {
    "h": 216.404,
    "s": 64.964,
    "l": 26.863
  },
  "oklch": {
    "l": 0.35859,
    "c": 0.10175,
    "h": 259
  },
  "luminance": 0.04514
}

Semantic roles & 50–950 ramp

primary

#183B71

secondary

#A67E3E

accent

#A640E8

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183B71

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

Preview Lab → · Contrast checker → · Palette generator →