#183D5A#183D5A

#183D5A is a dark, moderate cyan. Relative luminance 0.043; OKLCH L 34.8% C 0.066 H 245.1°. Best body text is #FFFFFF at 11.33:1 contrast (WCAG AA passes).

Color values

HEX	#183D5A
RGB	rgb(24, 61, 90)
HSL	hsl(206, 58%, 22%)
HSV	hsv(206, 73%, 35%)
CMYK	cmyk(73.3%, 32.2%, 0%, 64.7%)
CIE-LAB	lab(24.54, -2.44, -21.20)
CIE-LCH	lch(24.54, 21.34, 263.43°)
OKLab	oklab(34.81% -0.0278 -0.0599)
OKLCH	oklch(34.81% 0.066 245.1)
XYZ	xyz(3.8902, 4.2695, 10.2899)
Luminance	0.0427 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D5A #5A3518

analogous

#185A56 #183D5A #181C5A

triadic

#183D5A #5A183D #3D5A18

tetradic

#183D5A #56185A #5A3518 #1C5A18

square

#183D5A #56185A #5A3518 #1C5A18

split-complementary

#183D5A #5A181C #5A5618

monochromatic

#061018 #0B1C2A #183D5A #255E8A #327EBB

Accessibility & contrast

On white

11.33

#183D5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#183D5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D5A

11.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D5A	#FFFFFF	#000000	##FFFFFF
##183D5A	1.00	11.33	1.85	11.33
#FFFFFF	11.33	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#303E5B

Deuteranopia (green-blind)

#273759

Tritanopia (blue-blind)

#004447

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183d5a;
/* rgb */ color: rgb(24, 61, 90);
/* oklch */ color: oklch(34.8% 0.066 245.1);

Tailwind

colors: {
  custom: {
    50: '#5e7289',
    500: '#183d5a',
    950: '#000000',
  },
}

SCSS

$custom: #183d5a;
$custom-light: #5e7289;
$custom-dark: #000000;

JSON

{
  "hex": "#183d5a",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 90
  },
  "hsl": {
    "h": 206.364,
    "s": 57.895,
    "l": 22.353
  },
  "oklch": {
    "l": 0.34808,
    "c": 0.06604,
    "h": 245.1
  },
  "luminance": 0.0427
}

Semantic roles & 50–950 ramp

primary

#183D5A

secondary

#91623D

accent

#8B47E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183D5A

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

Preview Lab → · Contrast checker → · Palette generator →