#183F5C#183F5C

#183F5C is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.5% C 0.067 H 243.9°. Best body text is #FFFFFF at 11.03:1 contrast (WCAG AA passes).

Color values

HEX	#183F5C
RGB	rgb(24, 63, 92)
HSL	hsl(206, 59%, 23%)
HSV	hsv(206, 74%, 36%)
CMYK	cmyk(73.9%, 31.5%, 0%, 63.9%)
CIE-LAB	lab(25.33, -2.98, -21.27)
CIE-LCH	lch(25.33, 21.48, 262.02°)
OKLab	oklab(35.46% -0.0294 -0.0601)
OKLCH	oklch(35.46% 0.067 243.9)
XYZ	xyz(4.0852, 4.5215, 10.7806)
Luminance	0.0452 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F5C #5C3518

analogous

#185C57 #183F5C #181D5C

triadic

#183F5C #5C183F #3F5C18

tetradic

#183F5C #57185C #5C3518 #1D5C18

square

#183F5C #57185C #5C3518 #1D5C18

split-complementary

#183F5C #5C181D #5C5718

monochromatic

#061118 #0B1E2B #183F5C #25608D #3181BD

Accessibility & contrast

On white

11.03

#183F5C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#183F5C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F5C

11.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F5C	#FFFFFF	#000000	##FFFFFF
##183F5C	1.00	11.03	1.90	11.03
#FFFFFF	11.03	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#32405D

Deuteranopia (green-blind)

#29395B

Tritanopia (blue-blind)

#004649

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183f5c;
/* rgb */ color: rgb(24, 63, 92);
/* oklch */ color: oklch(35.5% 0.067 243.9);

Tailwind

colors: {
  custom: {
    50: '#5e738a',
    500: '#183f5c',
    950: '#000000',
  },
}

SCSS

$custom: #183f5c;
$custom-light: #5e738a;
$custom-dark: #000000;

JSON

{
  "hex": "#183f5c",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 92
  },
  "hsl": {
    "h": 205.588,
    "s": 58.621,
    "l": 22.745
  },
  "oklch": {
    "l": 0.35461,
    "c": 0.06691,
    "h": 243.9
  },
  "luminance": 0.04522
}

Semantic roles & 50–950 ramp

primary

#183F5C

secondary

#93623D

accent

#8846E2

background

#F5F7F8

surface

#EAEDF0

border

#C6C8CB

text

#05080B

muted

#797B7C

Preview Lab

Preview with #183F5C

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

Preview Lab → · Contrast checker → · Palette generator →