#183C5B#183C5B

#183C5B is a dark, moderate cyan. Relative luminance 0.042; OKLCH L 34.6% C 0.068 H 247.4°. Best body text is #FFFFFF at 11.44:1 contrast (WCAG AA passes).

Color values

HEX	#183C5B
RGB	rgb(24, 60, 91)
HSL	hsl(208, 58%, 23%)
HSV	hsv(208, 74%, 36%)
CMYK	cmyk(73.6%, 34.1%, 0%, 64.3%)
CIE-LAB	lab(24.26, -1.37, -22.29)
CIE-LCH	lch(24.26, 22.34, 266.48°)
OKLab	oklab(34.6% -0.0263 -0.0631)
OKLCH	oklch(34.6% 0.068 247.4)
XYZ	xyz(3.8802, 4.1808, 10.4980)
Luminance	0.0418 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183C5B #5B3718

analogous

#185B58 #183C5B #181B5B

triadic

#183C5B #5B183C #3C5B18

tetradic

#183C5B #58185B #5B3718 #1B5B18

square

#183C5B #58185B #5B3718 #1B5B18

split-complementary

#183C5B #5B181B #5B5818

monochromatic

#061018 #0B1C2B #183C5B #255C8B #327CBC

Accessibility & contrast

On white

11.44

#183C5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#183C5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183C5B

11.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183C5B	#FFFFFF	#000000	##FFFFFF
##183C5B	1.00	11.44	1.84	11.44
#FFFFFF	11.44	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E3D5C

Deuteranopia (green-blind)

#25375A

Tritanopia (blue-blind)

#004347

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183c5b;
/* rgb */ color: rgb(24, 60, 91);
/* oklch */ color: oklch(34.6% 0.068 247.4);

Tailwind

colors: {
  custom: {
    50: '#5e7189',
    500: '#183c5b',
    950: '#000000',
  },
}

SCSS

$custom: #183c5b;
$custom-light: #5e7189;
$custom-dark: #000000;

JSON

{
  "hex": "#183c5b",
  "rgb": {
    "r": 24,
    "g": 60,
    "b": 91
  },
  "hsl": {
    "h": 207.761,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.34604,
    "c": 0.06837,
    "h": 247.4
  },
  "luminance": 0.04181
}

Semantic roles & 50–950 ramp

primary

#183C5B

secondary

#92643D

accent

#8E46E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183C5B

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

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