#183E55#183E55

#183E55 is a dark, muted cyan. Relative luminance 0.043; OKLCH L 34.8% C 0.059 H 238.3°. Best body text is #FFFFFF at 11.30:1 contrast (WCAG AA passes).

Color values

HEX	#183E55
RGB	rgb(24, 62, 85)
HSL	hsl(203, 56%, 21%)
HSV	hsv(203, 72%, 33%)
CMYK	cmyk(71.8%, 27.1%, 0%, 66.7%)
CIE-LAB	lab(24.62, -5.06, -17.80)
CIE-LCH	lch(24.62, 18.51, 254.13°)
OKLab	oklab(34.79% -0.0309 -0.05)
OKLCH	oklch(34.79% 0.059 238.3)
XYZ	xyz(3.7384, 4.2949, 9.2246)
Luminance	0.0430 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183E55 #552F18

analogous

#18554E #183E55 #182055

triadic

#183E55 #55183E #3E5518

tetradic

#183E55 #4E1855 #552F18 #205518

square

#183E55 #4E1855 #552F18 #205518

split-complementary

#183E55 #551820 #554E18

monochromatic

#071118 #0B1B25 #183E55 #256185 #3384B4

Accessibility & contrast

On white

11.30

#183E55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#183E55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183E55

11.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183E55	#FFFFFF	#000000	##FFFFFF
##183E55	1.00	11.30	1.86	11.30
#FFFFFF	11.30	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#333E56

Deuteranopia (green-blind)

#2B3855

Tritanopia (blue-blind)

#004446

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183e55;
/* rgb */ color: rgb(24, 62, 85);
/* oklch */ color: oklch(34.8% 0.059 238.3);

Tailwind

colors: {
  custom: {
    50: '#5d7385',
    500: '#183e55',
    950: '#000000',
  },
}

SCSS

$custom: #183e55;
$custom-light: #5d7385;
$custom-dark: #000000;

JSON

{
  "hex": "#183e55",
  "rgb": {
    "r": 24,
    "g": 62,
    "b": 85
  },
  "hsl": {
    "h": 202.623,
    "s": 55.963,
    "l": 21.373
  },
  "oklch": {
    "l": 0.34787,
    "c": 0.0588,
    "h": 238.3
  },
  "luminance": 0.04295
}

Semantic roles & 50–950 ramp

primary

#183E55

secondary

#8C5B3D

accent

#8149DF

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#04080B

muted

#797B7C

Preview Lab

Preview with #183E55

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

Preview Lab → · Contrast checker → · Palette generator →