#183D8D#183D8D

#183D8D is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.6% C 0.140 H 262.9°. Best body text is #FFFFFF at 10.04:1 contrast (WCAG AA passes).

Color values

HEX	#183D8D
RGB	rgb(24, 61, 141)
HSL	hsl(221, 71%, 32%)
HSV	hsv(221, 83%, 55%)
CMYK	cmyk(83%, 56.7%, 0%, 44.7%)
CIE-LAB	lab(27.99, 18.47, -48.05)
CIE-LCH	lch(27.99, 51.48, 291.03°)
OKLab	oklab(38.58% -0.0173 -0.1387)
OKLCH	oklch(38.58% 0.14 262.9)
XYZ	xyz(6.8514, 5.4539, 25.8858)
Luminance	0.0546 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D8D #8D6818

analogous

#18778D #183D8D #2E188D

triadic

#183D8D #8D183D #3D8D18

tetradic

#183D8D #8D1877 #8D6818 #188D2E

square

#183D8D #8D1877 #8D6818 #188D2E

split-complementary

#183D8D #8D2E18 #778D18

monochromatic

#061024 #0F2659 #183D8D #2154C1 #4173DF

Accessibility & contrast

On white

10.04

#183D8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#183D8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D8D

10.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D8D	#FFFFFF	#000000	##FFFFFF
##183D8D	1.00	10.04	2.09	10.04
#FFFFFF	10.04	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004890

Deuteranopia (green-blind)

#003D8B

Tritanopia (blue-blind)

#00515F

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #183d8d;
/* rgb */ color: rgb(24, 61, 141);
/* oklch */ color: oklch(38.6% 0.140 262.9);

Tailwind

colors: {
  custom: {
    50: '#6a71af',
    500: '#183d8d',
    950: '#000000',
  },
}

SCSS

$custom: #183d8d;
$custom-light: #6a71af;
$custom-dark: #000000;

JSON

{
  "hex": "#183d8d",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 141
  },
  "hsl": {
    "h": 221.026,
    "s": 70.909,
    "l": 32.353
  },
  "oklch": {
    "l": 0.38576,
    "c": 0.13978,
    "h": 262.9
  },
  "luminance": 0.05455
}

Semantic roles & 50–950 ramp

primary

#183D8D

secondary

#BF9742

accent

#B53AEE

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #183D8D

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

Preview Lab → · Contrast checker → · Palette generator →