#183D59#183D59

#183D59 is a dark, moderate cyan. Relative luminance 0.043; OKLCH L 34.7% C 0.065 H 244.2°. Best body text is #FFFFFF at 11.35:1 contrast (WCAG AA passes).

Color values

HEX	#183D59
RGB	rgb(24, 61, 89)
HSL	hsl(206, 58%, 22%)
HSV	hsv(206, 73%, 35%)
CMYK	cmyk(73%, 31.5%, 0%, 65.1%)
CIE-LAB	lab(24.49, -2.84, -20.63)
CIE-LCH	lch(24.49, 20.82, 262.17°)
OKLab	oklab(34.75% -0.0282 -0.0582)
OKLCH	oklch(34.75% 0.065 244.2)
XYZ	xyz(3.8479, 4.2525, 10.0673)
Luminance	0.0425 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D59 #593418

analogous

#185955 #183D59 #181D59

triadic

#183D59 #59183D #3D5918

tetradic

#183D59 #551859 #593418 #1D5918

square

#183D59 #551859 #593418 #1D5918

split-complementary

#183D59 #59181D #595518

monochromatic

#061118 #0B1C29 #183D59 #255E89 #327FB9

Accessibility & contrast

On white

11.35

#183D59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#183D59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D59

11.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D59	#FFFFFF	#000000	##FFFFFF
##183D59	1.00	11.35	1.85	11.35
#FFFFFF	11.35	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#303E5A

Deuteranopia (green-blind)

#273758

Tritanopia (blue-blind)

#004447

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183d59;
/* rgb */ color: rgb(24, 61, 89);
/* oklch */ color: oklch(34.7% 0.065 244.2);

Tailwind

colors: {
  custom: {
    50: '#5e7288',
    500: '#183d59',
    950: '#000000',
  },
}

SCSS

$custom: #183d59;
$custom-light: #5e7288;
$custom-dark: #000000;

JSON

{
  "hex": "#183d59",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 89
  },
  "hsl": {
    "h": 205.846,
    "s": 57.522,
    "l": 22.157
  },
  "oklch": {
    "l": 0.34749,
    "c": 0.0647,
    "h": 244.2
  },
  "luminance": 0.04253
}

Semantic roles & 50–950 ramp

primary

#183D59

secondary

#90613D

accent

#8947E1

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183D59

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

Preview Lab → · Contrast checker → · Palette generator →