#183E8F#183E8F

#183E8F is a dark, vivid blue. Relative luminance 0.056; OKLCH L 39.0% C 0.141 H 262.8°. Best body text is #FFFFFF at 9.88:1 contrast (WCAG AA passes).

Color values

HEX	#183E8F
RGB	rgb(24, 62, 143)
HSL	hsl(221, 71%, 33%)
HSV	hsv(221, 83%, 56%)
CMYK	cmyk(83.2%, 56.6%, 0%, 43.9%)
CIE-LAB	lab(28.44, 18.59, -48.56)
CIE-LCH	lch(28.44, 52.00, 290.95°)
OKLab	oklab(38.96% -0.0178 -0.1402)
OKLCH	oklch(38.96% 0.141 262.8)
XYZ	xyz(7.0555, 5.6218, 26.6945)
Luminance	0.0562 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183E8F #8F6918

analogous

#187A8F #183E8F #2D188F

triadic

#183E8F #8F183E #3E8F18

tetradic

#183E8F #8F187A #8F6918 #188F2D

square

#183E8F #8F187A #8F6918 #188F2D

split-complementary

#183E8F #8F2D18 #7A8F18

monochromatic

#061126 #0F275B #183E8F #2155C3 #4274DF

Accessibility & contrast

On white

9.88

#183E8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#183E8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183E8F

9.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183E8F	#FFFFFF	#000000	##FFFFFF
##183E8F	1.00	9.88	2.12	9.88
#FFFFFF	9.88	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004992

Deuteranopia (green-blind)

#003E8D

Tritanopia (blue-blind)

#005260

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #183e8f;
/* rgb */ color: rgb(24, 62, 143);
/* oklch */ color: oklch(39.0% 0.141 262.8);

Tailwind

colors: {
  custom: {
    50: '#6b72b0',
    500: '#183e8f',
    950: '#000000',
  },
}

SCSS

$custom: #183e8f;
$custom-light: #6b72b0;
$custom-dark: #000000;

JSON

{
  "hex": "#183e8f",
  "rgb": {
    "r": 24,
    "g": 62,
    "b": 143
  },
  "hsl": {
    "h": 220.84,
    "s": 71.257,
    "l": 32.745
  },
  "oklch": {
    "l": 0.38964,
    "c": 0.14131,
    "h": 262.8
  },
  "luminance": 0.05623
}

Semantic roles & 50–950 ramp

primary

#183E8F

secondary

#C09843

accent

#B43AEE

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080811

muted

#7A7B80

Preview Lab

Preview with #183E8F

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

Preview Lab → · Contrast checker → · Palette generator →