#183F78#183F78

#183F78 is a dark, moderate blue. Relative luminance 0.051; OKLCH L 37.3% C 0.107 H 258.2°. Best body text is #FFFFFF at 10.39:1 contrast (WCAG AA passes).

Color values

HEX	#183F78
RGB	rgb(24, 63, 120)
HSL	hsl(216, 67%, 28%)
HSV	hsv(216, 80%, 47%)
CMYK	cmyk(80%, 47.5%, 0%, 52.9%)
CIE-LAB	lab(27.03, 8.42, -36.50)
CIE-LCH	lch(27.03, 37.46, 282.99°)
OKLab	oklab(37.35% -0.0218 -0.1047)
OKLCH	oklch(37.35% 0.107 258.2)
XYZ	xyz(5.5431, 5.1046, 18.4588)
Luminance	0.0510 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F78 #785118

analogous

#186F78 #183F78 #211878

triadic

#183F78 #78183F #3F7818

tetradic

#183F78 #78186F #785118 #187821

square

#183F78 #78186F #785118 #187821

split-complementary

#183F78 #782118 #6F7818

monochromatic

#050D1A #0E2445 #183F78 #225AAB #3476D6

Accessibility & contrast

On white

10.39

#183F78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#183F78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F78

10.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F78	#FFFFFF	#000000	##FFFFFF
##183F78	1.00	10.39	2.02	10.39
#FFFFFF	10.39	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.39	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#21457A

Deuteranopia (green-blind)

#0B3C77

Tritanopia (blue-blind)

#004D55

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183f78;
/* rgb */ color: rgb(24, 63, 120);
/* oklch */ color: oklch(37.3% 0.107 258.2);

Tailwind

colors: {
  custom: {
    50: '#65739f',
    500: '#183f78',
    950: '#000000',
  },
}

SCSS

$custom: #183f78;
$custom-light: #65739f;
$custom-dark: #000000;

JSON

{
  "hex": "#183f78",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 120
  },
  "hsl": {
    "h": 215.625,
    "s": 66.667,
    "l": 28.235
  },
  "oklch": {
    "l": 0.37347,
    "c": 0.10692,
    "h": 258.2
  },
  "luminance": 0.05105
}

Semantic roles & 50–950 ramp

primary

#183F78

secondary

#AD803F

accent

#A43EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080E

muted

#7A7B7E

Preview Lab

Preview with #183F78

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

Preview Lab → · Contrast checker → · Palette generator →