#183D58#183D58

#183D58 is a dark, moderate cyan. Relative luminance 0.042; OKLCH L 34.7% C 0.063 H 243.2°. Best body text is #FFFFFF at 11.37:1 contrast (WCAG AA passes).

Color values

HEX	#183D58
RGB	rgb(24, 61, 88)
HSL	hsl(205, 57%, 22%)
HSV	hsv(205, 73%, 35%)
CMYK	cmyk(72.7%, 30.7%, 0%, 65.5%)
CIE-LAB	lab(24.44, -3.23, -20.06)
CIE-LCH	lch(24.44, 20.32, 260.84°)
OKLab	oklab(34.69% -0.0285 -0.0566)
OKLCH	oklch(34.69% 0.063 243.2)
XYZ	xyz(3.8062, 4.2359, 9.8476)
Luminance	0.0424 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D58 #583318

analogous

#185853 #183D58 #181D58

triadic

#183D58 #58183D #3D5818

tetradic

#183D58 #531858 #583318 #1D5818

square

#183D58 #531858 #583318 #1D5818

split-complementary

#183D58 #58181D #585318

monochromatic

#071118 #0B1C28 #183D58 #255E88 #3280B8

Accessibility & contrast

On white

11.37

#183D58 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#183D58 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D58

11.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D58	#FFFFFF	#000000	##FFFFFF
##183D58	1.00	11.37	1.85	11.37
#FFFFFF	11.37	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313E59

Deuteranopia (green-blind)

#283758

Tritanopia (blue-blind)

#004446

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183d58;
/* rgb */ color: rgb(24, 61, 88);
/* oklch */ color: oklch(34.7% 0.063 243.2);

Tailwind

colors: {
  custom: {
    50: '#5d7287',
    500: '#183d58',
    950: '#000000',
  },
}

SCSS

$custom: #183d58;
$custom-light: #5d7287;
$custom-dark: #000000;

JSON

{
  "hex": "#183d58",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 88
  },
  "hsl": {
    "h": 205.313,
    "s": 57.143,
    "l": 21.961
  },
  "oklch": {
    "l": 0.34689,
    "c": 0.06337,
    "h": 243.2
  },
  "luminance": 0.04236
}

Semantic roles & 50–950 ramp

primary

#183D58

secondary

#8F603D

accent

#8847E0

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183D58

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

Preview Lab → · Contrast checker → · Palette generator →