#183F87#183F87

#183F87 is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.5% C 0.129 H 261.3°. Best body text is #FFFFFF at 10.00:1 contrast (WCAG AA passes).

Color values

HEX	#183F87
RGB	rgb(24, 63, 135)
HSL	hsl(219, 70%, 31%)
HSV	hsv(219, 82%, 53%)
CMYK	cmyk(82.2%, 53.3%, 0%, 47.1%)
CIE-LAB	lab(28.11, 14.62, -44.15)
CIE-LCH	lch(28.11, 46.51, 288.32°)
OKLab	oklab(38.52% -0.0194 -0.1272)
OKLCH	oklch(38.52% 0.129 261.3)
XYZ	xyz(6.5258, 5.4977, 23.6342)
Luminance	0.0550 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F87 #876018

analogous

#187687 #183F87 #281887

triadic

#183F87 #87183F #3F8718

tetradic

#183F87 #871876 #876018 #188728

square

#183F87 #871876 #876018 #188728

split-complementary

#183F87 #872818 #768718

monochromatic

#060F1F #0F2753 #183F87 #2157BB #3D75DC

Accessibility & contrast

On white

10.00

#183F87 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#183F87 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F87

10.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F87	#FFFFFF	#000000	##FFFFFF
##183F87	1.00	10.00	2.10	10.00
#FFFFFF	10.00	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D488A

Deuteranopia (green-blind)

#003E86

Tritanopia (blue-blind)

#00515C

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #183f87;
/* rgb */ color: rgb(24, 63, 135);
/* oklch */ color: oklch(38.5% 0.129 261.3);

Tailwind

colors: {
  custom: {
    50: '#6873aa',
    500: '#183f87',
    950: '#000000',
  },
}

SCSS

$custom: #183f87;
$custom-light: #6873aa;
$custom-dark: #000000;

JSON

{
  "hex": "#183f87",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 135
  },
  "hsl": {
    "h": 218.919,
    "s": 69.811,
    "l": 31.176
  },
  "oklch": {
    "l": 0.38517,
    "c": 0.12866,
    "h": 261.3
  },
  "luminance": 0.05498
}

Semantic roles & 50–950 ramp

primary

#183F87

secondary

#BB9040

accent

#AE3BED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #183F87

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

Preview Lab → · Contrast checker → · Palette generator →