#183F5D#183F5D

#183F5D is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.5% C 0.068 H 244.8°. Best body text is #FFFFFF at 11.01:1 contrast (WCAG AA passes).

Color values

HEX	#183F5D
RGB	rgb(24, 63, 93)
HSL	hsl(206, 59%, 23%)
HSV	hsv(206, 74%, 36%)
CMYK	cmyk(74.2%, 32.3%, 0%, 63.5%)
CIE-LAB	lab(25.38, -2.59, -21.84)
CIE-LCH	lch(25.38, 21.99, 263.24°)
OKLab	oklab(35.52% -0.0291 -0.0617)
OKLCH	oklch(35.52% 0.068 244.8)
XYZ	xyz(4.1292, 4.5391, 11.0123)
Luminance	0.0454 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F5D #5D3618

analogous

#185D58 #183F5D #181C5D

triadic

#183F5D #5D183F #3F5D18

tetradic

#183F5D #58185D #5D3618 #1C5D18

square

#183F5D #58185D #5D3618 #1C5D18

split-complementary

#183F5D #5D181C #5D5818

monochromatic

#061018 #0B1E2C #183F5D #25608E #3181BE

Accessibility & contrast

On white

11.01

#183F5D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.91

#183F5D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F5D

11.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F5D	#FFFFFF	#000000	##FFFFFF
##183F5D	1.00	11.01	1.91	11.01
#FFFFFF	11.01	1.00	21.00	1.00
#000000	1.91	21.00	1.00	21.00
##FFFFFF	11.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#31405E

Deuteranopia (green-blind)

#28395C

Tritanopia (blue-blind)

#00464A

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183f5d;
/* rgb */ color: rgb(24, 63, 93);
/* oklch */ color: oklch(35.5% 0.068 244.8);

Tailwind

colors: {
  custom: {
    50: '#5e738b',
    500: '#183f5d',
    950: '#000000',
  },
}

SCSS

$custom: #183f5d;
$custom-light: #5e738b;
$custom-dark: #000000;

JSON

{
  "hex": "#183f5d",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 93
  },
  "hsl": {
    "h": 206.087,
    "s": 58.974,
    "l": 22.941
  },
  "oklch": {
    "l": 0.35521,
    "c": 0.06825,
    "h": 244.8
  },
  "luminance": 0.0454
}

Semantic roles & 50–950 ramp

primary

#183F5D

secondary

#93633D

accent

#8A46E2

background

#F5F7F8

surface

#EAEDF0

border

#C6C8CB

text

#05080C

muted

#797B7D

Preview Lab

Preview with #183F5D

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

Preview Lab → · Contrast checker → · Palette generator →