#183C88#183C88

#183C88 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 37.9% C 0.134 H 262.7°. Best body text is #FFFFFF at 10.29:1 contrast (WCAG AA passes).

Color values

HEX	#183C88
RGB	rgb(24, 60, 136)
HSL	hsl(221, 70%, 31%)
HSV	hsv(221, 82%, 53%)
CMYK	cmyk(82.4%, 55.9%, 0%, 46.7%)
CIE-LAB	lab(27.30, 17.13, -46.07)
CIE-LCH	lch(27.30, 49.15, 290.39°)
OKLab	oklab(37.93% -0.017 -0.1329)
OKLCH	oklch(37.93% 0.134 262.7)
XYZ	xyz(6.4349, 5.2027, 23.9529)
Luminance	0.0520 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183C88 #886418

analogous

#187488 #183C88 #2C1888

triadic

#183C88 #88183C #3C8818

tetradic

#183C88 #881874 #886418 #18882C

square

#183C88 #881874 #886418 #18882C

split-complementary

#183C88 #882C18 #748818

monochromatic

#060E20 #0F2554 #183C88 #2153BC #3E71DD

Accessibility & contrast

On white

10.29

#183C88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#183C88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183C88

10.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183C88	#FFFFFF	#000000	##FFFFFF
##183C88	1.00	10.29	2.04	10.29
#FFFFFF	10.29	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468B

Deuteranopia (green-blind)

#003C87

Tritanopia (blue-blind)

#004F5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183c88;
/* rgb */ color: rgb(24, 60, 136);
/* oklch */ color: oklch(37.9% 0.134 262.7);

Tailwind

colors: {
  custom: {
    50: '#6971ab',
    500: '#183c88',
    950: '#000000',
  },
}

SCSS

$custom: #183c88;
$custom-light: #6971ab;
$custom-dark: #000000;

JSON

{
  "hex": "#183c88",
  "rgb": {
    "r": 24,
    "g": 60,
    "b": 136
  },
  "hsl": {
    "h": 220.714,
    "s": 70,
    "l": 31.373
  },
  "oklch": {
    "l": 0.37931,
    "c": 0.134,
    "h": 262.7
  },
  "luminance": 0.05203
}

Semantic roles & 50–950 ramp

primary

#183C88

secondary

#BC9440

accent

#B43BED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #183C88

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

Preview Lab → · Contrast checker → · Palette generator →