#183F4E#183F4E

#183F4E is a dark, muted cyan. Relative luminance 0.043; OKLCH L 34.7% C 0.051 H 226.4°. Best body text is #FFFFFF at 11.29:1 contrast (WCAG AA passes).

Color values

HEX	#183F4E
RGB	rgb(24, 63, 78)
HSL	hsl(197, 53%, 20%)
HSV	hsv(197, 69%, 31%)
CMYK	cmyk(69.2%, 19.2%, 0%, 69.4%)
CIE-LAB	lab(24.64, -8.35, -13.18)
CIE-LCH	lch(24.64, 15.60, 237.63°)
OKLab	oklab(34.69% -0.035 -0.0368)
OKLCH	oklch(34.69% 0.051 226.4)
XYZ	xyz(3.5288, 4.2989, 7.8501)
Luminance	0.0430 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F4E #4E2718

analogous

#184E42 #183F4E #18244E

triadic

#183F4E #4E183F #3F4E18

tetradic

#183F4E #42184E #4E2718 #244E18

square

#183F4E #42184E #4E2718 #244E18

split-complementary

#183F4E #4E1824 #4E4218

monochromatic

#071317 #0A191F #183F4E #26657D #358BAC

Accessibility & contrast

On white

11.29

#183F4E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#183F4E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F4E

11.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F4E	#FFFFFF	#000000	##FFFFFF
##183F4E	1.00	11.29	1.86	11.29
#FFFFFF	11.29	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#373E4F

Deuteranopia (green-blind)

#2F384E

Tritanopia (blue-blind)

#004344

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183f4e;
/* rgb */ color: rgb(24, 63, 78);
/* oklch */ color: oklch(34.7% 0.051 226.4);

Tailwind

colors: {
  custom: {
    50: '#5c747f',
    500: '#183f4e',
    950: '#000000',
  },
}

SCSS

$custom: #183f4e;
$custom-light: #5c747f;
$custom-dark: #000000;

JSON

{
  "hex": "#183f4e",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 78
  },
  "hsl": {
    "h": 196.667,
    "s": 52.941,
    "l": 20
  },
  "oklch": {
    "l": 0.34686,
    "c": 0.05078,
    "h": 226.4
  },
  "luminance": 0.04299
}

Semantic roles & 50–950 ramp

primary

#183F4E

secondary

#85513D

accent

#744BDC

background

#F5F7F7

surface

#E9EDEE

border

#C5C8C9

text

#04080A

muted

#797B7C

Preview Lab

Preview with #183F4E

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

Preview Lab → · Contrast checker → · Palette generator →