#183D5B#183D5B

#183D5B is a dark, moderate cyan. Relative luminance 0.043; OKLCH L 34.9% C 0.067 H 245.9°. Best body text is #FFFFFF at 11.31:1 contrast (WCAG AA passes).

Color values

HEX	#183D5B
RGB	rgb(24, 61, 91)
HSL	hsl(207, 58%, 23%)
HSV	hsv(207, 74%, 36%)
CMYK	cmyk(73.6%, 33%, 0%, 64.3%)
CIE-LAB	lab(24.60, -2.05, -21.77)
CIE-LCH	lch(24.60, 21.86, 264.63°)
OKLab	oklab(34.87% -0.0275 -0.0615)
OKLCH	oklch(34.87% 0.067 245.9)
XYZ	xyz(3.9330, 4.2866, 10.5156)
Luminance	0.0429 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D5B #5B3618

analogous

#185B58 #183D5B #181B5B

triadic

#183D5B #5B183D #3D5B18

tetradic

#183D5B #58185B #5B3618 #1B5B18

square

#183D5B #58185B #5B3618 #1B5B18

split-complementary

#183D5B #5B181B #5B5818

monochromatic

#061018 #0B1D2B #183D5B #255D8B #327EBC

Accessibility & contrast

On white

11.31

#183D5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#183D5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D5B

11.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D5B	#FFFFFF	#000000	##FFFFFF
##183D5B	1.00	11.31	1.86	11.31
#FFFFFF	11.31	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#303E5C

Deuteranopia (green-blind)

#26385A

Tritanopia (blue-blind)

#004448

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183d5b;
/* rgb */ color: rgb(24, 61, 91);
/* oklch */ color: oklch(34.9% 0.067 245.9);

Tailwind

colors: {
  custom: {
    50: '#5e7289',
    500: '#183d5b',
    950: '#000000',
  },
}

SCSS

$custom: #183d5b;
$custom-light: #5e7289;
$custom-dark: #000000;

JSON

{
  "hex": "#183d5b",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 91
  },
  "hsl": {
    "h": 206.866,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.34869,
    "c": 0.06741,
    "h": 245.9
  },
  "luminance": 0.04287
}

Semantic roles & 50–950 ramp

primary

#183D5B

secondary

#92633D

accent

#8C46E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183D5B

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

Preview Lab → · Contrast checker → · Palette generator →