#183F66#183F66

#183F66 is a dark, moderate cyan. Relative luminance 0.047; OKLCH L 36.1% C 0.081 H 251.1°. Best body text is #FFFFFF at 10.81:1 contrast (WCAG AA passes).

Color values

HEX	#183F66
RGB	rgb(24, 63, 102)
HSL	hsl(210, 62%, 25%)
HSV	hsv(210, 76%, 40%)
CMYK	cmyk(76.5%, 38.2%, 0%, 60%)
CIE-LAB	lab(25.89, 1.03, -26.86)
CIE-LCH	lch(25.89, 26.88, 272.19°)
OKLab	oklab(36.09% -0.0262 -0.0764)
OKLCH	oklch(36.09% 0.081 251.1)
XYZ	xyz(4.5516, 4.7080, 13.2367)
Luminance	0.0471 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F66 #663F18

analogous

#186666 #183F66 #181866

triadic

#183F66 #66183F #3F6618

tetradic

#183F66 #661866 #663F18 #186618

square

#183F66 #661866 #663F18 #186618

split-complementary

#183F66 #661818 #666618

monochromatic

#060F19 #0C2034 #183F66 #245E98 #2F7CC9

Accessibility & contrast

On white

10.81

#183F66 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#183F66 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F66

10.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F66	#FFFFFF	#000000	##FFFFFF
##183F66	1.00	10.81	1.94	10.81
#FFFFFF	10.81	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D4168

Deuteranopia (green-blind)

#223A65

Tritanopia (blue-blind)

#00484D

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #183f66;
/* rgb */ color: rgb(24, 63, 102);
/* oklch */ color: oklch(36.1% 0.081 251.1);

Tailwind

colors: {
  custom: {
    50: '#607392',
    500: '#183f66',
    950: '#000000',
  },
}

SCSS

$custom: #183f66;
$custom-light: #607392;
$custom-dark: #000000;

JSON

{
  "hex": "#183f66",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 102
  },
  "hsl": {
    "h": 210,
    "s": 61.905,
    "l": 24.706
  },
  "oklch": {
    "l": 0.36086,
    "c": 0.08074,
    "h": 251.1
  },
  "luminance": 0.04709
}

Semantic roles & 50–950 ramp

primary

#183F66

secondary

#9C6D3E

accent

#9443E5

background

#F6F6F9

surface

#EBECF1

border

#C6C7CB

text

#05080D

muted

#7A7B7E

Preview Lab

Preview with #183F66

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

Preview Lab → · Contrast checker → · Palette generator →