#183A5D#183A5D

#183A5D is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.2% C 0.073 H 251.4°. Best body text is #FFFFFF at 11.65:1 contrast (WCAG AA passes).

Color values

HEX	#183A5D
RGB	rgb(24, 58, 93)
HSL	hsl(210, 59%, 23%)
HSV	hsv(210, 74%, 36%)
CMYK	cmyk(74.2%, 37.6%, 0%, 63.5%)
CIE-LAB	lab(23.71, 0.79, -24.48)
CIE-LCH	lch(23.71, 24.49, 271.86°)
OKLab	oklab(34.21% -0.0234 -0.0695)
OKLCH	oklch(34.21% 0.073 251.4)
XYZ	xyz(3.8648, 4.0102, 10.9242)
Luminance	0.0401 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A5D #5D3B18

analogous

#185C5D #183A5D #19185D

triadic

#183A5D #5D183A #3A5D18

tetradic

#183A5D #5D185C #5D3B18 #185D19

square

#183A5D #5D185C #5D3B18 #185D19

split-complementary

#183A5D #5D1918 #5C5D18

monochromatic

#060F18 #0B1C2C #183A5D #25588E #3177BE

Accessibility & contrast

On white

11.65

#183A5D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.80

#183A5D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A5D

11.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A5D	#FFFFFF	#000000	##FFFFFF
##183A5D	1.00	11.65	1.80	11.65
#FFFFFF	11.65	1.00	21.00	1.00
#000000	1.80	21.00	1.00	21.00
##FFFFFF	11.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2A3C5E

Deuteranopia (green-blind)

#20355C

Tritanopia (blue-blind)

#004247

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #183a5d;
/* rgb */ color: rgb(24, 58, 93);
/* oklch */ color: oklch(34.2% 0.073 251.4);

Tailwind

colors: {
  custom: {
    50: '#5e6f8b',
    500: '#183a5d',
    950: '#000000',
  },
}

SCSS

$custom: #183a5d;
$custom-light: #5e6f8b;
$custom-dark: #000000;

JSON

{
  "hex": "#183a5d",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 93
  },
  "hsl": {
    "h": 210.435,
    "s": 58.974,
    "l": 22.941
  },
  "oklch": {
    "l": 0.34205,
    "c": 0.07332,
    "h": 251.4
  },
  "luminance": 0.04011
}

Semantic roles & 50–950 ramp

primary

#183A5D

secondary

#93693D

accent

#9546E2

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #183A5D

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

Preview Lab → · Contrast checker → · Palette generator →