#183D99#183D99

#183D99 is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.6% C 0.156 H 263.9°. Best body text is #FFFFFF at 9.69:1 contrast (WCAG AA passes).

Color values

HEX	#183D99
RGB	rgb(24, 61, 153)
HSL	hsl(223, 73%, 35%)
HSV	hsv(223, 84%, 60%)
CMYK	cmyk(84.3%, 60.1%, 0%, 40%)
CIE-LAB	lab(28.98, 23.33, -53.80)
CIE-LCH	lch(28.98, 58.64, 293.45°)
OKLab	oklab(39.63% -0.0166 -0.1556)
OKLCH	oklch(39.63% 0.156 263.9)
XYZ	xyz(7.7932, 5.8306, 30.8455)
Luminance	0.0583 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D99 #997418

analogous

#187D99 #183D99 #341899

triadic

#183D99 #99183D #3D9918

tetradic

#183D99 #99187D #997418 #189934

square

#183D99 #99187D #997418 #189934

split-complementary

#183D99 #993418 #7D9918

monochromatic

#07132F #102864 #183D99 #2052CE #4975E2

Accessibility & contrast

On white

9.69

#183D99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.17

#183D99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D99

9.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D99	#FFFFFF	#000000	##FFFFFF
##183D99	1.00	9.69	2.17	9.69
#FFFFFF	9.69	1.00	21.00	1.00
#000000	2.17	21.00	1.00	21.00
##FFFFFF	9.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004A9C

Deuteranopia (green-blind)

#003F97

Tritanopia (blue-blind)

#005465

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #183d99;
/* rgb */ color: rgb(24, 61, 153);
/* oklch */ color: oklch(39.6% 0.156 263.9);

Tailwind

colors: {
  custom: {
    50: '#6d72b8',
    500: '#183d99',
    950: '#000000',
  },
}

SCSS

$custom: #183d99;
$custom-light: #6d72b8;
$custom-dark: #000000;

JSON

{
  "hex": "#183d99",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 153
  },
  "hsl": {
    "h": 222.791,
    "s": 72.881,
    "l": 34.706
  },
  "oklch": {
    "l": 0.39631,
    "c": 0.15647,
    "h": 263.9
  },
  "luminance": 0.05832
}

Semantic roles & 50–950 ramp

primary

#183D99

secondary

#C4A149

accent

#BB38F0

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #183D99

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

Preview Lab → · Contrast checker → · Palette generator →