#183A5A#183A5A

#183A5A is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.0% C 0.069 H 249.3°. Best body text is #FFFFFF at 11.72:1 contrast (WCAG AA passes).

Color values

HEX	#183A5A
RGB	rgb(24, 58, 90)
HSL	hsl(209, 58%, 22%)
HSV	hsv(209, 73%, 35%)
CMYK	cmyk(73.3%, 35.6%, 0%, 64.7%)
CIE-LAB	lab(23.53, -0.42, -22.79)
CIE-LCH	lch(23.53, 22.79, 268.95°)
OKLab	oklab(34.01% -0.0243 -0.0646)
OKLCH	oklch(34.01% 0.069 249.3)
XYZ	xyz(3.7345, 3.9581, 10.2381)
Luminance	0.0396 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A5A #5A3818

analogous

#185A59 #183A5A #18195A

triadic

#183A5A #5A183A #3A5A18

tetradic

#183A5A #59185A #5A3818 #195A18

square

#183A5A #59185A #5A3818 #195A18

split-complementary

#183A5A #5A1819 #5A5918

monochromatic

#061018 #0B1B2A #183A5A #25598A #3278BB

Accessibility & contrast

On white

11.72

#183A5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#183A5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A5A

11.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A5A	#FFFFFF	#000000	##FFFFFF
##183A5A	1.00	11.72	1.79	11.72
#FFFFFF	11.72	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C3C5B

Deuteranopia (green-blind)

#233559

Tritanopia (blue-blind)

#004245

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #183a5a;
/* rgb */ color: rgb(24, 58, 90);
/* oklch */ color: oklch(34.0% 0.069 249.3);

Tailwind

colors: {
  custom: {
    50: '#5e6f89',
    500: '#183a5a',
    950: '#000000',
  },
}

SCSS

$custom: #183a5a;
$custom-light: #5e6f89;
$custom-dark: #000000;

JSON

{
  "hex": "#183a5a",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 90
  },
  "hsl": {
    "h": 209.091,
    "s": 57.895,
    "l": 22.353
  },
  "oklch": {
    "l": 0.34013,
    "c": 0.069,
    "h": 249.3
  },
  "luminance": 0.03958
}

Semantic roles & 50–950 ramp

primary

#183A5A

secondary

#91663D

accent

#9247E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183A5A

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

Preview Lab → · Contrast checker → · Palette generator →