#183B8B#183B8B

#183B8B is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.0% C 0.140 H 263.4°. Best body text is #FFFFFF at 10.31:1 contrast (WCAG AA passes).

Color values

HEX	#183B8B
RGB	rgb(24, 59, 139)
HSL	hsl(222, 71%, 32%)
HSV	hsv(222, 83%, 55%)
CMYK	cmyk(82.7%, 57.6%, 0%, 45.5%)
CIE-LAB	lab(27.26, 19.05, -48.01)
CIE-LCH	lch(27.26, 51.65, 291.65°)
OKLab	oklab(37.97% -0.0161 -0.1386)
OKLCH	oklch(37.97% 0.14 263.4)
XYZ	xyz(6.5992, 5.1854, 25.0742)
Luminance	0.0519 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B8B #8B6818

analogous

#18758B #183B8B #2F188B

triadic

#183B8B #8B183B #3B8B18

tetradic

#183B8B #8B1875 #8B6818 #188B2F

square

#183B8B #8B1875 #8B6818 #188B2F

split-complementary

#183B8B #8B2F18 #758B18

monochromatic

#060F23 #0F2557 #183B8B #2151BF #3F70DE

Accessibility & contrast

On white

10.31

#183B8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#183B8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B8B

10.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B8B	#FFFFFF	#000000	##FFFFFF
##183B8B	1.00	10.31	2.04	10.31
#FFFFFF	10.31	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468E

Deuteranopia (green-blind)

#003B89

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183b8b;
/* rgb */ color: rgb(24, 59, 139);
/* oklch */ color: oklch(38.0% 0.140 263.4);

Tailwind

colors: {
  custom: {
    50: '#6a70ae',
    500: '#183b8b',
    950: '#000000',
  },
}

SCSS

$custom: #183b8b;
$custom-light: #6a70ae;
$custom-dark: #000000;

JSON

{
  "hex": "#183b8b",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 139
  },
  "hsl": {
    "h": 221.739,
    "s": 70.552,
    "l": 31.961
  },
  "oklch": {
    "l": 0.37971,
    "c": 0.13955,
    "h": 263.4
  },
  "luminance": 0.05186
}

Semantic roles & 50–950 ramp

primary

#183B8B

secondary

#BE9840

accent

#B73AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #183B8B

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

Preview Lab → · Contrast checker → · Palette generator →