#183F99#183F99

#183F99 is a dark, vivid blue. Relative luminance 0.060; OKLCH L 40.0% C 0.154 H 263.4°. Best body text is #FFFFFF at 9.50:1 contrast (WCAG AA passes).

Color values

HEX	#183F99
RGB	rgb(24, 63, 153)
HSL	hsl(222, 73%, 35%)
HSV	hsv(222, 84%, 60%)
CMYK	cmyk(84.3%, 58.8%, 0%, 40%)
CIE-LAB	lab(29.53, 21.96, -52.90)
CIE-LCH	lch(29.53, 57.28, 292.54°)
OKLab	oklab(40.04% -0.0178 -0.1529)
OKLCH	oklch(40.04% 0.154 263.4)
XYZ	xyz(7.9019, 6.0481, 30.8818)
Luminance	0.0605 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F99 #997218

analogous

#188099 #183F99 #311899

triadic

#183F99 #99183F #3F9918

tetradic

#183F99 #991880 #997218 #189931

square

#183F99 #991880 #997218 #189931

split-complementary

#183F99 #993118 #809918

monochromatic

#07132F #102964 #183F99 #2055CE #4977E2

Accessibility & contrast

On white

9.50

#183F99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#183F99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F99

9.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F99	#FFFFFF	#000000	##FFFFFF
##183F99	1.00	9.50	2.21	9.50
#FFFFFF	9.50	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9C

Deuteranopia (green-blind)

#004097

Tritanopia (blue-blind)

#005665

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #183f99;
/* rgb */ color: rgb(24, 63, 153);
/* oklch */ color: oklch(40.0% 0.154 263.4);

Tailwind

colors: {
  custom: {
    50: '#6d73b8',
    500: '#183f99',
    950: '#000000',
  },
}

SCSS

$custom: #183f99;
$custom-light: #6d73b8;
$custom-dark: #000000;

JSON

{
  "hex": "#183f99",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 153
  },
  "hsl": {
    "h": 221.86,
    "s": 72.881,
    "l": 34.706
  },
  "oklch": {
    "l": 0.40045,
    "c": 0.15394,
    "h": 263.4
  },
  "luminance": 0.06049
}

Semantic roles & 50–950 ramp

primary

#183F99

secondary

#C49F49

accent

#B838F0

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#080811

muted

#7B7B80

Preview Lab

Preview with #183F99

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

Preview Lab → · Contrast checker → · Palette generator →