#183F4F#183F4F

#183F4F is a dark, muted cyan. Relative luminance 0.043; OKLCH L 34.7% C 0.052 H 228.0°. Best body text is #FFFFFF at 11.27:1 contrast (WCAG AA passes).

Color values

HEX	#183F4F
RGB	rgb(24, 63, 79)
HSL	hsl(197, 53%, 20%)
HSV	hsv(197, 70%, 31%)
CMYK	cmyk(69.6%, 20.3%, 0%, 69%)
CIE-LAB	lab(24.68, -7.98, -13.77)
CIE-LCH	lch(24.68, 15.91, 239.89°)
OKLab	oklab(34.74% -0.0346 -0.0385)
OKLCH	oklch(34.74% 0.052 228)
XYZ	xyz(3.5649, 4.3134, 8.0403)
Luminance	0.0431 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F4F #4F2818

analogous

#184F44 #183F4F #18234F

triadic

#183F4F #4F183F #3F4F18

tetradic

#183F4F #44184F #4F2818 #234F18

square

#183F4F #44184F #4F2818 #234F18

split-complementary

#183F4F #4F1823 #4F4418

monochromatic

#071317 #0A1A20 #183F4F #26647E #358AAD

Accessibility & contrast

On white

11.27

#183F4F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#183F4F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F4F

11.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F4F	#FFFFFF	#000000	##FFFFFF
##183F4F	1.00	11.27	1.86	11.27
#FFFFFF	11.27	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#373E50

Deuteranopia (green-blind)

#2F384F

Tritanopia (blue-blind)

#004444

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183f4f;
/* rgb */ color: rgb(24, 63, 79);
/* oklch */ color: oklch(34.7% 0.052 228.0);

Tailwind

colors: {
  custom: {
    50: '#5c7480',
    500: '#183f4f',
    950: '#000000',
  },
}

SCSS

$custom: #183f4f;
$custom-light: #5c7480;
$custom-dark: #000000;

JSON

{
  "hex": "#183f4f",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 79
  },
  "hsl": {
    "h": 197.455,
    "s": 53.398,
    "l": 20.196
  },
  "oklch": {
    "l": 0.34738,
    "c": 0.05172,
    "h": 228
  },
  "luminance": 0.04314
}

Semantic roles & 50–950 ramp

primary

#183F4F

secondary

#86523D

accent

#754BDD

background

#F5F7F7

surface

#E9EDEE

border

#C5C8C9

text

#04080A

muted

#797B7C

Preview Lab

Preview with #183F4F

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

Preview Lab → · Contrast checker → · Palette generator →