#183C8B#183C8B

#183C8B is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.2% C 0.138 H 263.0°. Best body text is #FFFFFF at 10.20:1 contrast (WCAG AA passes).

Color values

HEX	#183C8B
RGB	rgb(24, 60, 139)
HSL	hsl(221, 71%, 32%)
HSV	hsv(221, 83%, 55%)
CMYK	cmyk(82.7%, 56.8%, 0%, 45.5%)
CIE-LAB	lab(27.54, 18.36, -47.54)
CIE-LCH	lch(27.54, 50.96, 291.11°)
OKLab	oklab(38.19% -0.0168 -0.1372)
OKLCH	oklch(38.19% 0.138 263)
XYZ	xyz(6.6511, 5.2892, 25.0915)
Luminance	0.0529 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183C8B #8B6718

analogous

#18768B #183C8B #2D188B

triadic

#183C8B #8B183C #3C8B18

tetradic

#183C8B #8B1876 #8B6718 #188B2D

square

#183C8B #8B1876 #8B6718 #188B2D

split-complementary

#183C8B #8B2D18 #768B18

monochromatic

#060F23 #0F2557 #183C8B #2153BF #3F71DE

Accessibility & contrast

On white

10.20

#183C8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#183C8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183C8B

10.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183C8B	#FFFFFF	#000000	##FFFFFF
##183C8B	1.00	10.20	2.06	10.20
#FFFFFF	10.20	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003C89

Tritanopia (blue-blind)

#00505D

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #183c8b;
/* rgb */ color: rgb(24, 60, 139);
/* oklch */ color: oklch(38.2% 0.138 263.0);

Tailwind

colors: {
  custom: {
    50: '#6a71ae',
    500: '#183c8b',
    950: '#000000',
  },
}

SCSS

$custom: #183c8b;
$custom-light: #6a71ae;
$custom-dark: #000000;

JSON

{
  "hex": "#183c8b",
  "rgb": {
    "r": 24,
    "g": 60,
    "b": 139
  },
  "hsl": {
    "h": 221.217,
    "s": 70.552,
    "l": 31.961
  },
  "oklch": {
    "l": 0.38187,
    "c": 0.13825,
    "h": 263
  },
  "luminance": 0.0529
}

Semantic roles & 50–950 ramp

primary

#183C8B

secondary

#BE9740

accent

#B53AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #183C8B

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

Preview Lab → · Contrast checker → · Palette generator →