#183D78#183D78

#183D78 is a dark, moderate blue. Relative luminance 0.049; OKLCH L 36.9% C 0.110 H 259.5°. Best body text is #FFFFFF at 10.62:1 contrast (WCAG AA passes).

Color values

HEX	#183D78
RGB	rgb(24, 61, 120)
HSL	hsl(217, 67%, 28%)
HSV	hsv(217, 80%, 47%)
CMYK	cmyk(80%, 49.2%, 0%, 52.9%)
CIE-LAB	lab(26.41, 9.82, -37.50)
CIE-LCH	lch(26.41, 38.76, 284.67°)
OKLab	oklab(36.87% -0.02 -0.1077)
OKLCH	oklch(36.87% 0.11 259.5)
XYZ	xyz(5.4344, 4.8871, 18.4226)
Luminance	0.0489 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D78 #785318

analogous

#186D78 #183D78 #231878

triadic

#183D78 #78183D #3D7818

tetradic

#183D78 #78186D #785318 #187823

square

#183D78 #78186D #785318 #187823

split-complementary

#183D78 #782318 #6D7818

monochromatic

#050D1A #0E2345 #183D78 #2257AB #3473D6

Accessibility & contrast

On white

10.62

#183D78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#183D78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D78

10.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D78	#FFFFFF	#000000	##FFFFFF
##183D78	1.00	10.62	1.98	10.62
#FFFFFF	10.62	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1D437A

Deuteranopia (green-blind)

#023A77

Tritanopia (blue-blind)

#004B54

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #183d78;
/* rgb */ color: rgb(24, 61, 120);
/* oklch */ color: oklch(36.9% 0.110 259.5);

Tailwind

colors: {
  custom: {
    50: '#65719f',
    500: '#183d78',
    950: '#000000',
  },
}

SCSS

$custom: #183d78;
$custom-light: #65719f;
$custom-dark: #000000;

JSON

{
  "hex": "#183d78",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 120
  },
  "hsl": {
    "h": 216.875,
    "s": 66.667,
    "l": 28.235
  },
  "oklch": {
    "l": 0.36869,
    "c": 0.1095,
    "h": 259.5
  },
  "luminance": 0.04888
}

Semantic roles & 50–950 ramp

primary

#183D78

secondary

#AD833F

accent

#A83EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183D78

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

Preview Lab → · Contrast checker → · Palette generator →