#183C81#183C81

#183C81 is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.3% C 0.124 H 261.7°. Best body text is #FFFFFF at 10.49:1 contrast (WCAG AA passes).

Color values

HEX	#183C81
RGB	rgb(24, 60, 129)
HSL	hsl(219, 69%, 30%)
HSV	hsv(219, 81%, 51%)
CMYK	cmyk(81.4%, 53.5%, 0%, 49.4%)
CIE-LAB	lab(26.76, 14.24, -42.58)
CIE-LCH	lch(26.76, 44.90, 288.50°)
OKLab	oklab(37.35% -0.0178 -0.1226)
OKLCH	oklch(37.35% 0.124 261.7)
XYZ	xyz(5.9536, 5.0102, 21.4179)
Luminance	0.0501 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183C81 #815D18

analogous

#187081 #183C81 #291881

triadic

#183C81 #81183C #3C8118

tetradic

#183C81 #811870 #815D18 #188129

square

#183C81 #811870 #815D18 #188129

split-complementary

#183C81 #812918 #708118

monochromatic

#050C1A #0E244D #183C81 #2254B5 #3970DA

Accessibility & contrast

On white

10.49

#183C81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#183C81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183C81

10.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183C81	#FFFFFF	#000000	##FFFFFF
##183C81	1.00	10.49	2.00	10.49
#FFFFFF	10.49	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D4483

Deuteranopia (green-blind)

#003B80

Tritanopia (blue-blind)

#004D58

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #183c81;
/* rgb */ color: rgb(24, 60, 129);
/* oklch */ color: oklch(37.3% 0.124 261.7);

Tailwind

colors: {
  custom: {
    50: '#6771a6',
    500: '#183c81',
    950: '#000000',
  },
}

SCSS

$custom: #183c81;
$custom-light: #6771a6;
$custom-dark: #000000;

JSON

{
  "hex": "#183c81",
  "rgb": {
    "r": 24,
    "g": 60,
    "b": 129
  },
  "hsl": {
    "h": 219.429,
    "s": 68.627,
    "l": 30
  },
  "oklch": {
    "l": 0.37349,
    "c": 0.12393,
    "h": 261.7
  },
  "luminance": 0.05011
}

Semantic roles & 50–950 ramp

primary

#183C81

secondary

#B58D40

accent

#AF3CEB

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #183C81

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

Preview Lab → · Contrast checker → · Palette generator →