#183B5D#183B5D

#183B5D is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.5% C 0.072 H 250.1°. Best body text is #FFFFFF at 11.52:1 contrast (WCAG AA passes).

Color values

HEX	#183B5D
RGB	rgb(24, 59, 93)
HSL	hsl(210, 59%, 23%)
HSV	hsv(210, 74%, 36%)
CMYK	cmyk(74.2%, 36.6%, 0%, 63.5%)
CIE-LAB	lab(24.04, 0.11, -23.95)
CIE-LCH	lch(24.04, 23.95, 270.26°)
OKLab	oklab(34.47% -0.0245 -0.0679)
OKLCH	oklch(34.47% 0.072 250.1)
XYZ	xyz(3.9157, 4.1120, 10.9411)
Luminance	0.0411 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B5D #5D3A18

analogous

#185D5C #183B5D #18195D

triadic

#183B5D #5D183B #3B5D18

tetradic

#183B5D #5C185D #5D3A18 #195D18

square

#183B5D #5C185D #5D3A18 #195D18

split-complementary

#183B5D #5D1819 #5D5C18

monochromatic

#060F18 #0B1C2C #183B5D #255A8E #3179BE

Accessibility & contrast

On white

11.52

#183B5D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#183B5D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B5D

11.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B5D	#FFFFFF	#000000	##FFFFFF
##183B5D	1.00	11.52	1.82	11.52
#FFFFFF	11.52	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C3D5E

Deuteranopia (green-blind)

#22365C

Tritanopia (blue-blind)

#004347

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183b5d;
/* rgb */ color: rgb(24, 59, 93);
/* oklch */ color: oklch(34.5% 0.072 250.1);

Tailwind

colors: {
  custom: {
    50: '#5e708b',
    500: '#183b5d',
    950: '#000000',
  },
}

SCSS

$custom: #183b5d;
$custom-light: #5e708b;
$custom-dark: #000000;

JSON

{
  "hex": "#183b5d",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 93
  },
  "hsl": {
    "h": 209.565,
    "s": 58.974,
    "l": 22.941
  },
  "oklch": {
    "l": 0.34466,
    "c": 0.07223,
    "h": 250.1
  },
  "luminance": 0.04112
}

Semantic roles & 50–950 ramp

primary

#183B5D

secondary

#93683D

accent

#9346E2

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #183B5D

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

Preview Lab → · Contrast checker → · Palette generator →