#183E78#183E78

#183E78 is a dark, moderate blue. Relative luminance 0.050; OKLCH L 37.1% C 0.108 H 258.9°. Best body text is #FFFFFF at 10.50:1 contrast (WCAG AA passes).

Color values

HEX	#183E78
RGB	rgb(24, 62, 120)
HSL	hsl(216, 67%, 28%)
HSV	hsv(216, 80%, 47%)
CMYK	cmyk(80%, 48.3%, 0%, 52.9%)
CIE-LAB	lab(26.72, 9.12, -37.00)
CIE-LCH	lch(26.72, 38.11, 283.84°)
OKLab	oklab(37.11% -0.0209 -0.1062)
OKLCH	oklch(37.11% 0.108 258.9)
XYZ	xyz(5.4882, 4.9949, 18.4405)
Luminance	0.0500 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183E78 #785218

analogous

#186E78 #183E78 #221878

triadic

#183E78 #78183E #3E7818

tetradic

#183E78 #78186E #785218 #187822

square

#183E78 #78186E #785218 #187822

split-complementary

#183E78 #782218 #6E7818

monochromatic

#050D1A #0E2445 #183E78 #2258AB #3474D6

Accessibility & contrast

On white

10.50

#183E78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#183E78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183E78

10.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183E78	#FFFFFF	#000000	##FFFFFF
##183E78	1.00	10.50	2.00	10.50
#FFFFFF	10.50	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F447A

Deuteranopia (green-blind)

#073B77

Tritanopia (blue-blind)

#004C55

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #183e78;
/* rgb */ color: rgb(24, 62, 120);
/* oklch */ color: oklch(37.1% 0.108 258.9);

Tailwind

colors: {
  custom: {
    50: '#65729f',
    500: '#183e78',
    950: '#000000',
  },
}

SCSS

$custom: #183e78;
$custom-light: #65729f;
$custom-dark: #000000;

JSON

{
  "hex": "#183e78",
  "rgb": {
    "r": 24,
    "g": 62,
    "b": 120
  },
  "hsl": {
    "h": 216.25,
    "s": 66.667,
    "l": 28.235
  },
  "oklch": {
    "l": 0.37107,
    "c": 0.10821,
    "h": 258.9
  },
  "luminance": 0.04996
}

Semantic roles & 50–950 ramp

primary

#183E78

secondary

#AD813F

accent

#A63EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080E

muted

#7A7B7E

Preview Lab

Preview with #183E78

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

Preview Lab → · Contrast checker → · Palette generator →