#183D8C#183D8C

#183D8C is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.5% C 0.138 H 262.8°. Best body text is #FFFFFF at 10.07:1 contrast (WCAG AA passes).

Color values

HEX	#183D8C
RGB	rgb(24, 61, 140)
HSL	hsl(221, 71%, 32%)
HSV	hsv(221, 83%, 55%)
CMYK	cmyk(82.9%, 56.4%, 0%, 45.1%)
CIE-LAB	lab(27.91, 18.07, -47.56)
CIE-LCH	lch(27.91, 50.88, 290.80°)
OKLab	oklab(38.49% -0.0174 -0.1373)
OKLCH	oklch(38.49% 0.138 262.8)
XYZ	xyz(6.7774, 5.4243, 25.4957)
Luminance	0.0542 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D8C #8C6718

analogous

#18778C #183D8C #2D188C

triadic

#183D8C #8C183D #3D8C18

tetradic

#183D8C #8C1877 #8C6718 #188C2D

square

#183D8C #8C1877 #8C6718 #188C2D

split-complementary

#183D8C #8C2D18 #778C18

monochromatic

#060F24 #0F2658 #183D8C #2154C0 #4073DE

Accessibility & contrast

On white

10.07

#183D8C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#183D8C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D8C

10.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D8C	#FFFFFF	#000000	##FFFFFF
##183D8C	1.00	10.07	2.09	10.07
#FFFFFF	10.07	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478F

Deuteranopia (green-blind)

#003D8A

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #183d8c;
/* rgb */ color: rgb(24, 61, 140);
/* oklch */ color: oklch(38.5% 0.138 262.8);

Tailwind

colors: {
  custom: {
    50: '#6a71ae',
    500: '#183d8c',
    950: '#000000',
  },
}

SCSS

$custom: #183d8c;
$custom-light: #6a71ae;
$custom-dark: #000000;

JSON

{
  "hex": "#183d8c",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 140
  },
  "hsl": {
    "h": 220.862,
    "s": 70.732,
    "l": 32.157
  },
  "oklch": {
    "l": 0.3849,
    "c": 0.13838,
    "h": 262.8
  },
  "luminance": 0.05425
}

Semantic roles & 50–950 ramp

primary

#183D8C

secondary

#BF9741

accent

#B43AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #183D8C

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

Preview Lab → · Contrast checker → · Palette generator →