#183A8E#183A8E

#183A8E is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.0% C 0.145 H 264.0°. Best body text is #FFFFFF at 10.32:1 contrast (WCAG AA passes).

Color values

HEX	#183A8E
RGB	rgb(24, 58, 142)
HSL	hsl(223, 71%, 33%)
HSV	hsv(223, 83%, 56%)
CMYK	cmyk(83.1%, 59.2%, 0%, 44.3%)
CIE-LAB	lab(27.22, 20.97, -49.92)
CIE-LCH	lch(27.22, 54.15, 292.79°)
OKLab	oklab(38.02% -0.0152 -0.1443)
OKLCH	oklch(38.02% 0.145 264)
XYZ	xyz(6.7705, 5.1725, 26.2275)
Luminance	0.0517 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A8E #8E6C18

analogous

#18758E #183A8E #31188E

triadic

#183A8E #8E183A #3A8E18

tetradic

#183A8E #8E1875 #8E6C18 #188E31

square

#183A8E #8E1875 #8E6C18 #188E31

split-complementary

#183A8E #8E3118 #758E18

monochromatic

#060F25 #0F255A #183A8E #214FC2 #416FDF

Accessibility & contrast

On white

10.32

#183A8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#183A8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A8E

10.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A8E	#FFFFFF	#000000	##FFFFFF
##183A8E	1.00	10.32	2.03	10.32
#FFFFFF	10.32	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004691

Deuteranopia (green-blind)

#003B8C

Tritanopia (blue-blind)

#004F5E

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183a8e;
/* rgb */ color: rgb(24, 58, 142);
/* oklch */ color: oklch(38.0% 0.145 264.0);

Tailwind

colors: {
  custom: {
    50: '#6b6fb0',
    500: '#183a8e',
    950: '#000000',
  },
}

SCSS

$custom: #183a8e;
$custom-light: #6b6fb0;
$custom-dark: #000000;

JSON

{
  "hex": "#183a8e",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 142
  },
  "hsl": {
    "h": 222.712,
    "s": 71.084,
    "l": 32.549
  },
  "oklch": {
    "l": 0.38021,
    "c": 0.14506,
    "h": 264
  },
  "luminance": 0.05173
}

Semantic roles & 50–950 ramp

primary

#183A8E

secondary

#C09B42

accent

#BA3AEE

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #183A8E

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

Preview Lab → · Contrast checker → · Palette generator →