#183C78#183C78

#183C78 is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.6% C 0.111 H 260.1°. Best body text is #FFFFFF at 10.73:1 contrast (WCAG AA passes).

Color values

HEX	#183C78
RGB	rgb(24, 60, 120)
HSL	hsl(218, 67%, 28%)
HSV	hsv(218, 80%, 47%)
CMYK	cmyk(80%, 50%, 0%, 52.9%)
CIE-LAB	lab(26.10, 10.52, -37.99)
CIE-LCH	lch(26.10, 39.42, 285.48°)
OKLab	oklab(36.63% -0.0191 -0.1091)
OKLCH	oklch(36.63% 0.111 260.1)
XYZ	xyz(5.3815, 4.7814, 18.4049)
Luminance	0.0478 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183C78 #785418

analogous

#186C78 #183C78 #241878

triadic

#183C78 #78183C #3C7818

tetradic

#183C78 #78186C #785418 #187824

square

#183C78 #78186C #785418 #187824

split-complementary

#183C78 #782418 #6C7818

monochromatic

#050D1A #0E2245 #183C78 #2255AB #3471D6

Accessibility & contrast

On white

10.73

#183C78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#183C78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183C78

10.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183C78	#FFFFFF	#000000	##FFFFFF
##183C78	1.00	10.73	1.96	10.73
#FFFFFF	10.73	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A427A

Deuteranopia (green-blind)

#003A77

Tritanopia (blue-blind)

#004A54

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #183c78;
/* rgb */ color: rgb(24, 60, 120);
/* oklch */ color: oklch(36.6% 0.111 260.1);

Tailwind

colors: {
  custom: {
    50: '#65719f',
    500: '#183c78',
    950: '#000000',
  },
}

SCSS

$custom: #183c78;
$custom-light: #65719f;
$custom-dark: #000000;

JSON

{
  "hex": "#183c78",
  "rgb": {
    "r": 24,
    "g": 60,
    "b": 120
  },
  "hsl": {
    "h": 217.5,
    "s": 66.667,
    "l": 28.235
  },
  "oklch": {
    "l": 0.36632,
    "c": 0.1108,
    "h": 260.1
  },
  "luminance": 0.04782
}

Semantic roles & 50–950 ramp

primary

#183C78

secondary

#AD843F

accent

#A93EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183C78

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

Preview Lab → · Contrast checker → · Palette generator →