#183A55#183A55

#183A55 is a dark, moderate cyan. Relative luminance 0.039; OKLCH L 33.7% C 0.062 H 245.1°. Best body text is #FFFFFF at 11.83:1 contrast (WCAG AA passes).

Color values

HEX	#183A55
RGB	rgb(24, 58, 85)
HSL	hsl(207, 56%, 21%)
HSV	hsv(207, 72%, 33%)
CMYK	cmyk(71.8%, 31.8%, 0%, 66.7%)
CIE-LAB	lab(23.26, -2.41, -19.93)
CIE-LCH	lch(23.26, 20.08, 263.11°)
OKLab	oklab(33.71% -0.0261 -0.0563)
OKLCH	oklch(33.71% 0.062 245.1)
XYZ	xyz(3.5288, 3.8758, 9.1547)
Luminance	0.0388 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A55 #553318

analogous

#185552 #183A55 #181C55

triadic

#183A55 #55183A #3A5518

tetradic

#183A55 #521855 #553318 #1C5518

square

#183A55 #521855 #553318 #1C5518

split-complementary

#183A55 #55181C #555218

monochromatic

#071018 #0B1925 #183A55 #255B85 #337BB4

Accessibility & contrast

On white

11.83

#183A55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#183A55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A55

11.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A55	#FFFFFF	#000000	##FFFFFF
##183A55	1.00	11.83	1.78	11.83
#FFFFFF	11.83	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E3B56

Deuteranopia (green-blind)

#263554

Tritanopia (blue-blind)

#004143

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #183a55;
/* rgb */ color: rgb(24, 58, 85);
/* oklch */ color: oklch(33.7% 0.062 245.1);

Tailwind

colors: {
  custom: {
    50: '#5d7085',
    500: '#183a55',
    950: '#000000',
  },
}

SCSS

$custom: #183a55;
$custom-light: #5d7085;
$custom-dark: #000000;

JSON

{
  "hex": "#183a55",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 85
  },
  "hsl": {
    "h": 206.557,
    "s": 55.963,
    "l": 21.373
  },
  "oklch": {
    "l": 0.33705,
    "c": 0.062,
    "h": 245.1
  },
  "luminance": 0.03876
}

Semantic roles & 50–950 ramp

primary

#183A55

secondary

#8C603D

accent

#8B49DF

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#04070B

muted

#797A7C

Preview Lab

Preview with #183A55

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

Preview Lab → · Contrast checker → · Palette generator →