#183A73#183A73

#183A73 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 35.8% C 0.106 H 260.1°. Best body text is #FFFFFF at 11.10:1 contrast (WCAG AA passes).

Color values

HEX	#183A73
RGB	rgb(24, 58, 115)
HSL	hsl(218, 65%, 27%)
HSV	hsv(218, 79%, 45%)
CMYK	cmyk(79.1%, 49.6%, 0%, 54.9%)
CIE-LAB	lab(25.13, 9.85, -36.39)
CIE-LCH	lch(25.13, 37.70, 285.15°)
OKLab	oklab(35.77% -0.0182 -0.1044)
OKLCH	oklch(35.77% 0.106 260.1)
XYZ	xyz(4.9831, 4.4575, 16.8141)
Luminance	0.0446 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A73 #735118

analogous

#186873 #183A73 #231873

triadic

#183A73 #73183A #3A7318

tetradic

#183A73 #731868 #735118 #187323

square

#183A73 #731868 #735118 #187323

split-complementary

#183A73 #732318 #687318

monochromatic

#050D19 #0D2040 #183A73 #2354A6 #316ED4

Accessibility & contrast

On white

11.10

#183A73 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#183A73 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A73

11.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A73	#FFFFFF	#000000	##FFFFFF
##183A73	1.00	11.10	1.89	11.10
#FFFFFF	11.10	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B4075

Deuteranopia (green-blind)

#023872

Tritanopia (blue-blind)

#004851

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183a73;
/* rgb */ color: rgb(24, 58, 115);
/* oklch */ color: oklch(35.8% 0.106 260.1);

Tailwind

colors: {
  custom: {
    50: '#636f9c',
    500: '#183a73',
    950: '#000000',
  },
}

SCSS

$custom: #183a73;
$custom-light: #636f9c;
$custom-dark: #000000;

JSON

{
  "hex": "#183a73",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 115
  },
  "hsl": {
    "h": 217.582,
    "s": 65.468,
    "l": 27.255
  },
  "oklch": {
    "l": 0.35771,
    "c": 0.10602,
    "h": 260.1
  },
  "luminance": 0.04458
}

Semantic roles & 50–950 ramp

primary

#183A73

secondary

#A8813F

accent

#A93FE8

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183A73

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

Preview Lab → · Contrast checker → · Palette generator →