#183B5A#183B5A

#183B5A is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.3% C 0.068 H 248.0°. Best body text is #FFFFFF at 11.59:1 contrast (WCAG AA passes).

Color values

HEX	#183B5A
RGB	rgb(24, 59, 90)
HSL	hsl(208, 58%, 22%)
HSV	hsv(208, 73%, 35%)
CMYK	cmyk(73.3%, 34.4%, 0%, 64.7%)
CIE-LAB	lab(23.87, -1.10, -22.26)
CIE-LCH	lch(23.87, 22.28, 267.18°)
OKLab	oklab(34.28% -0.0255 -0.063)
OKLCH	oklch(34.28% 0.068 248)
XYZ	xyz(3.7854, 4.0599, 10.2550)
Luminance	0.0406 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B5A #5A3718

analogous

#185A58 #183B5A #181A5A

triadic

#183B5A #5A183B #3B5A18

tetradic

#183B5A #58185A #5A3718 #1A5A18

square

#183B5A #58185A #5A3718 #1A5A18

split-complementary

#183B5A #5A181A #5A5818

monochromatic

#061018 #0B1B2A #183B5A #255B8A #327ABB

Accessibility & contrast

On white

11.59

#183B5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#183B5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B5A

11.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B5A	#FFFFFF	#000000	##FFFFFF
##183B5A	1.00	11.59	1.81	11.59
#FFFFFF	11.59	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D3C5B

Deuteranopia (green-blind)

#243659

Tritanopia (blue-blind)

#004246

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183b5a;
/* rgb */ color: rgb(24, 59, 90);
/* oklch */ color: oklch(34.3% 0.068 248.0);

Tailwind

colors: {
  custom: {
    50: '#5e7089',
    500: '#183b5a',
    950: '#000000',
  },
}

SCSS

$custom: #183b5a;
$custom-light: #5e7089;
$custom-dark: #000000;

JSON

{
  "hex": "#183b5a",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 90
  },
  "hsl": {
    "h": 208.182,
    "s": 57.895,
    "l": 22.353
  },
  "oklch": {
    "l": 0.34277,
    "c": 0.06797,
    "h": 248
  },
  "luminance": 0.0406
}

Semantic roles & 50–950 ramp

primary

#183B5A

secondary

#91643D

accent

#8F47E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183B5A

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

Preview Lab → · Contrast checker → · Palette generator →