#183D5C#183D5C

#183D5C is a dark, moderate cyan. Relative luminance 0.043; OKLCH L 34.9% C 0.069 H 246.8°. Best body text is #FFFFFF at 11.29:1 contrast (WCAG AA passes).

Color values

HEX	#183D5C
RGB	rgb(24, 61, 92)
HSL	hsl(207, 59%, 23%)
HSV	hsv(207, 74%, 36%)
CMYK	cmyk(73.9%, 33.7%, 0%, 63.9%)
CIE-LAB	lab(24.65, -1.65, -22.33)
CIE-LCH	lch(24.65, 22.39, 265.78°)
OKLab	oklab(34.93% -0.0271 -0.0632)
OKLCH	oklch(34.93% 0.069 246.8)
XYZ	xyz(3.9765, 4.3040, 10.7443)
Luminance	0.0430 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D5C #5C3718

analogous

#185C59 #183D5C #181B5C

triadic

#183D5C #5C183D #3D5C18

tetradic

#183D5C #59185C #5C3718 #1B5C18

square

#183D5C #59185C #5C3718 #1B5C18

split-complementary

#183D5C #5C181B #5C5918

monochromatic

#061018 #0B1D2B #183D5C #255D8D #317DBD

Accessibility & contrast

On white

11.29

#183D5C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#183D5C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D5C

11.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D5C	#FFFFFF	#000000	##FFFFFF
##183D5C	1.00	11.29	1.86	11.29
#FFFFFF	11.29	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F3E5D

Deuteranopia (green-blind)

#26385B

Tritanopia (blue-blind)

#004448

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183d5c;
/* rgb */ color: rgb(24, 61, 92);
/* oklch */ color: oklch(34.9% 0.069 246.8);

Tailwind

colors: {
  custom: {
    50: '#5e728a',
    500: '#183d5c',
    950: '#000000',
  },
}

SCSS

$custom: #183d5c;
$custom-light: #5e728a;
$custom-dark: #000000;

JSON

{
  "hex": "#183d5c",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 92
  },
  "hsl": {
    "h": 207.353,
    "s": 58.621,
    "l": 22.745
  },
  "oklch": {
    "l": 0.3493,
    "c": 0.06877,
    "h": 246.8
  },
  "luminance": 0.04304
}

Semantic roles & 50–950 ramp

primary

#183D5C

secondary

#93643D

accent

#8D46E2

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183D5C

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

Preview Lab → · Contrast checker → · Palette generator →