#183B88#183B88

#183B88 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.7% C 0.135 H 263.1°. Best body text is #FFFFFF at 10.40:1 contrast (WCAG AA passes).

Color values

HEX	#183B88
RGB	rgb(24, 59, 136)
HSL	hsl(221, 70%, 31%)
HSV	hsv(221, 82%, 53%)
CMYK	cmyk(82.4%, 56.6%, 0%, 46.7%)
CIE-LAB	lab(27.01, 17.83, -46.54)
CIE-LCH	lch(27.01, 49.84, 290.96°)
OKLab	oklab(37.71% -0.0163 -0.1343)
OKLCH	oklch(37.71% 0.135 263.1)
XYZ	xyz(6.3830, 5.0989, 23.9356)
Luminance	0.0510 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B88 #886518

analogous

#187388 #183B88 #2D1888

triadic

#183B88 #88183B #3B8818

tetradic

#183B88 #881873 #886518 #18882D

square

#183B88 #881873 #886518 #18882D

split-complementary

#183B88 #882D18 #738818

monochromatic

#060E20 #0F2454 #183B88 #2152BC #3E6FDD

Accessibility & contrast

On white

10.40

#183B88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#183B88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B88

10.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B88	#FFFFFF	#000000	##FFFFFF
##183B88	1.00	10.40	2.02	10.40
#FFFFFF	10.40	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458B

Deuteranopia (green-blind)

#003B86

Tritanopia (blue-blind)

#004E5B

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183b88;
/* rgb */ color: rgb(24, 59, 136);
/* oklch */ color: oklch(37.7% 0.135 263.1);

Tailwind

colors: {
  custom: {
    50: '#6970ab',
    500: '#183b88',
    950: '#000000',
  },
}

SCSS

$custom: #183b88;
$custom-light: #6970ab;
$custom-dark: #000000;

JSON

{
  "hex": "#183b88",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 136
  },
  "hsl": {
    "h": 221.25,
    "s": 70,
    "l": 31.373
  },
  "oklch": {
    "l": 0.37712,
    "c": 0.1353,
    "h": 263.1
  },
  "luminance": 0.051
}

Semantic roles & 50–950 ramp

primary

#183B88

secondary

#BC9540

accent

#B53BED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #183B88

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

Preview Lab → · Contrast checker → · Palette generator →