#183F58#183F58

#183F58 is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.2% C 0.062 H 240.0°. Best body text is #FFFFFF at 11.11:1 contrast (WCAG AA passes).

Color values

HEX	#183F58
RGB	rgb(24, 63, 88)
HSL	hsl(203, 57%, 22%)
HSV	hsv(203, 73%, 35%)
CMYK	cmyk(72.7%, 28.4%, 0%, 65.5%)
CIE-LAB	lab(25.12, -4.55, -18.99)
CIE-LCH	lch(25.12, 19.53, 256.52°)
OKLab	oklab(35.23% -0.0309 -0.0535)
OKLCH	oklch(35.23% 0.062 240)
XYZ	xyz(3.9150, 4.4534, 9.8839)
Luminance	0.0445 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F58 #583118

analogous

#185851 #183F58 #181F58

triadic

#183F58 #58183F #3F5818

tetradic

#183F58 #511858 #583118 #1F5818

square

#183F58 #511858 #583118 #1F5818

split-complementary

#183F58 #58181F #585118

monochromatic

#071118 #0B1D28 #183F58 #256188 #3284B8

Accessibility & contrast

On white

11.11

#183F58 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#183F58 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F58

11.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F58	#FFFFFF	#000000	##FFFFFF
##183F58	1.00	11.11	1.89	11.11
#FFFFFF	11.11	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#333F59

Deuteranopia (green-blind)

#2B3958

Tritanopia (blue-blind)

#004548

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183f58;
/* rgb */ color: rgb(24, 63, 88);
/* oklch */ color: oklch(35.2% 0.062 240.0);

Tailwind

colors: {
  custom: {
    50: '#5d7387',
    500: '#183f58',
    950: '#000000',
  },
}

SCSS

$custom: #183f58;
$custom-light: #5d7387;
$custom-dark: #000000;

JSON

{
  "hex": "#183f58",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 88
  },
  "hsl": {
    "h": 203.438,
    "s": 57.143,
    "l": 21.961
  },
  "oklch": {
    "l": 0.35228,
    "c": 0.06177,
    "h": 240
  },
  "luminance": 0.04454
}

Semantic roles & 50–950 ramp

primary

#183F58

secondary

#8F5D3D

accent

#8347E0

background

#F5F7F8

surface

#E9EDEF

border

#C5C8CA

text

#05080B

muted

#797B7C

Preview Lab

Preview with #183F58

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

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