#183B78#183B78

#183B78 is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.4% C 0.112 H 260.6°. Best body text is #FFFFFF at 10.85:1 contrast (WCAG AA passes).

Color values

HEX	#183B78
RGB	rgb(24, 59, 120)
HSL	hsl(218, 67%, 28%)
HSV	hsv(218, 80%, 47%)
CMYK	cmyk(80%, 50.8%, 0%, 52.9%)
CIE-LAB	lab(25.80, 11.22, -38.49)
CIE-LCH	lch(25.80, 40.09, 286.26°)
OKLab	oklab(36.4% -0.0182 -0.1106)
OKLCH	oklch(36.4% 0.112 260.6)
XYZ	xyz(5.3296, 4.6776, 18.3876)
Luminance	0.0468 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B78 #785518

analogous

#186B78 #183B78 #251878

triadic

#183B78 #78183B #3B7818

tetradic

#183B78 #78186B #785518 #187825

square

#183B78 #78186B #785518 #187825

split-complementary

#183B78 #782518 #6B7818

monochromatic

#050D1A #0E2245 #183B78 #2254AB #346FD6

Accessibility & contrast

On white

10.85

#183B78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#183B78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B78

10.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B78	#FFFFFF	#000000	##FFFFFF
##183B78	1.00	10.85	1.94	10.85
#FFFFFF	10.85	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#18427A

Deuteranopia (green-blind)

#003977

Tritanopia (blue-blind)

#004A53

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #183b78;
/* rgb */ color: rgb(24, 59, 120);
/* oklch */ color: oklch(36.4% 0.112 260.6);

Tailwind

colors: {
  custom: {
    50: '#65709f',
    500: '#183b78',
    950: '#000000',
  },
}

SCSS

$custom: #183b78;
$custom-light: #65709f;
$custom-dark: #000000;

JSON

{
  "hex": "#183b78",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 120
  },
  "hsl": {
    "h": 218.125,
    "s": 66.667,
    "l": 28.235
  },
  "oklch": {
    "l": 0.36397,
    "c": 0.1121,
    "h": 260.6
  },
  "luminance": 0.04678
}

Semantic roles & 50–950 ramp

primary

#183B78

secondary

#AD853F

accent

#AB3EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183B78

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

Preview Lab → · Contrast checker → · Palette generator →