#183F8C#183F8C

#183F8C is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.9% C 0.136 H 262.0°. Best body text is #FFFFFF at 9.87:1 contrast (WCAG AA passes).

Color values

HEX	#183F8C
RGB	rgb(24, 63, 140)
HSL	hsl(220, 71%, 32%)
HSV	hsv(220, 83%, 55%)
CMYK	cmyk(82.9%, 55%, 0%, 45.1%)
CIE-LAB	lab(28.49, 16.67, -46.62)
CIE-LCH	lch(28.49, 49.51, 289.68°)
OKLab	oklab(38.93% -0.0188 -0.1345)
OKLCH	oklch(38.93% 0.136 262)
XYZ	xyz(6.8861, 5.6418, 25.5319)
Luminance	0.0564 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F8C #8C6518

analogous

#18798C #183F8C #2B188C

triadic

#183F8C #8C183F #3F8C18

tetradic

#183F8C #8C1879 #8C6518 #188C2B

square

#183F8C #8C1879 #8C6518 #188C2B

split-complementary

#183F8C #8C2B18 #798C18

monochromatic

#061024 #0F2758 #183F8C #2157C0 #4075DE

Accessibility & contrast

On white

9.87

#183F8C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#183F8C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F8C

9.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F8C	#FFFFFF	#000000	##FFFFFF
##183F8C	1.00	9.87	2.13	9.87
#FFFFFF	9.87	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00498F

Deuteranopia (green-blind)

#003E8A

Tritanopia (blue-blind)

#00525F

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #183f8c;
/* rgb */ color: rgb(24, 63, 140);
/* oklch */ color: oklch(38.9% 0.136 262.0);

Tailwind

colors: {
  custom: {
    50: '#6a73ae',
    500: '#183f8c',
    950: '#000000',
  },
}

SCSS

$custom: #183f8c;
$custom-light: #6a73ae;
$custom-dark: #000000;

JSON

{
  "hex": "#183f8c",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 140
  },
  "hsl": {
    "h": 219.828,
    "s": 70.732,
    "l": 32.157
  },
  "oklch": {
    "l": 0.38929,
    "c": 0.13578,
    "h": 262
  },
  "luminance": 0.05643
}

Semantic roles & 50–950 ramp

primary

#183F8C

secondary

#BF9541

accent

#B13AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #183F8C

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

Preview Lab → · Contrast checker → · Palette generator →