#183B4F#183B4F

#183B4F is a dark, muted cyan. Relative luminance 0.039; OKLCH L 33.6% C 0.054 H 236.5°. Best body text is #FFFFFF at 11.82:1 contrast (WCAG AA passes).

Color values

HEX	#183B4F
RGB	rgb(24, 59, 79)
HSL	hsl(202, 53%, 20%)
HSV	hsv(202, 70%, 31%)
CMYK	cmyk(69.6%, 25.3%, 0%, 69%)
CIE-LAB	lab(23.29, -5.40, -15.91)
CIE-LCH	lch(23.29, 16.81, 251.24°)
OKLab	oklab(33.63% -0.0296 -0.0446)
OKLCH	oklch(33.63% 0.054 236.5)
XYZ	xyz(3.3514, 3.8863, 7.9691)
Luminance	0.0389 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B4F #4F2C18

analogous

#184F47 #183B4F #18204F

triadic

#183B4F #4F183B #3B4F18

tetradic

#183B4F #47184F #4F2C18 #204F18

square

#183B4F #47184F #4F2C18 #204F18

split-complementary

#183B4F #4F1820 #4F4718

monochromatic

#071217 #0A1820 #183B4F #265E7E #3581AD

Accessibility & contrast

On white

11.82

#183B4F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#183B4F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B4F

11.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B4F	#FFFFFF	#000000	##FFFFFF
##183B4F	1.00	11.82	1.78	11.82
#FFFFFF	11.82	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#323B50

Deuteranopia (green-blind)

#2A354F

Tritanopia (blue-blind)

#004042

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #183b4f;
/* rgb */ color: rgb(24, 59, 79);
/* oklch */ color: oklch(33.6% 0.054 236.5);

Tailwind

colors: {
  custom: {
    50: '#5c7080',
    500: '#183b4f',
    950: '#000000',
  },
}

SCSS

$custom: #183b4f;
$custom-light: #5c7080;
$custom-dark: #000000;

JSON

{
  "hex": "#183b4f",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 79
  },
  "hsl": {
    "h": 201.818,
    "s": 53.398,
    "l": 20.196
  },
  "oklch": {
    "l": 0.33632,
    "c": 0.05354,
    "h": 236.5
  },
  "luminance": 0.03887
}

Semantic roles & 50–950 ramp

primary

#183B4F

secondary

#86573D

accent

#804BDD

background

#F5F6F7

surface

#E9ECEE

border

#C5C7C9

text

#04070A

muted

#797A7C

Preview Lab

Preview with #183B4F

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

Preview Lab → · Contrast checker → · Palette generator →