#183E5A#183E5A

#183E5A is a dark, moderate cyan. Relative luminance 0.044; OKLCH L 35.1% C 0.065 H 243.6°. Best body text is #FFFFFF at 11.20:1 contrast (WCAG AA passes).

Color values

HEX	#183E5A
RGB	rgb(24, 62, 90)
HSL	hsl(205, 58%, 22%)
HSV	hsv(205, 73%, 35%)
CMYK	cmyk(73.3%, 31.1%, 0%, 64.7%)
CIE-LAB	lab(24.88, -3.11, -20.67)
CIE-LCH	lch(24.88, 20.90, 261.45°)
OKLab	oklab(35.08% -0.029 -0.0583)
OKLCH	oklch(35.08% 0.065 243.6)
XYZ	xyz(3.9441, 4.3772, 10.3079)
Luminance	0.0438 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183E5A #5A3418

analogous

#185A55 #183E5A #181D5A

triadic

#183E5A #5A183E #3E5A18

tetradic

#183E5A #55185A #5A3418 #1D5A18

square

#183E5A #55185A #5A3418 #1D5A18

split-complementary

#183E5A #5A181D #5A5518

monochromatic

#061118 #0B1D2A #183E5A #255F8A #3281BB

Accessibility & contrast

On white

11.20

#183E5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#183E5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183E5A

11.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183E5A	#FFFFFF	#000000	##FFFFFF
##183E5A	1.00	11.20	1.88	11.20
#FFFFFF	11.20	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313F5B

Deuteranopia (green-blind)

#283859

Tritanopia (blue-blind)

#004548

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183e5a;
/* rgb */ color: rgb(24, 62, 90);
/* oklch */ color: oklch(35.1% 0.065 243.6);

Tailwind

colors: {
  custom: {
    50: '#5e7388',
    500: '#183e5a',
    950: '#000000',
  },
}

SCSS

$custom: #183e5a;
$custom-light: #5e7388;
$custom-dark: #000000;

JSON

{
  "hex": "#183e5a",
  "rgb": {
    "r": 24,
    "g": 62,
    "b": 90
  },
  "hsl": {
    "h": 205.455,
    "s": 57.895,
    "l": 22.353
  },
  "oklch": {
    "l": 0.35076,
    "c": 0.06515,
    "h": 243.6
  },
  "luminance": 0.04378
}

Semantic roles & 50–950 ramp

primary

#183E5A

secondary

#91613D

accent

#8847E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05080B

muted

#797B7C

Preview Lab

Preview with #183E5A

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

Preview Lab → · Contrast checker → · Palette generator →