#183F70#183F70

#183F70 is a dark, moderate cyan. Relative luminance 0.049; OKLCH L 36.8% C 0.095 H 255.7°. Best body text is #FFFFFF at 10.59:1 contrast (WCAG AA passes).

Color values

HEX	#183F70
RGB	rgb(24, 63, 112)
HSL	hsl(213, 65%, 27%)
HSV	hsv(213, 79%, 44%)
CMYK	cmyk(78.6%, 43.7%, 0%, 56.1%)
CIE-LAB	lab(26.50, 5.12, -32.28)
CIE-LCH	lch(26.50, 32.68, 279.01°)
OKLab	oklab(36.77% -0.0235 -0.0923)
OKLCH	oklch(36.77% 0.095 255.7)
XYZ	xyz(5.0777, 4.9185, 16.0078)
Luminance	0.0492 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F70 #704918

analogous

#186B70 #183F70 #1D1870

triadic

#183F70 #70183F #3F7018

tetradic

#183F70 #70186B #704918 #18701D

square

#183F70 #70186B #704918 #18701D

split-complementary

#183F70 #701D18 #6B7018

monochromatic

#050E19 #0D233E #183F70 #235BA2 #3078D3

Accessibility & contrast

On white

10.59

#183F70 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#183F70 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F70

10.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F70	#FFFFFF	#000000	##FFFFFF
##183F70	1.00	10.59	1.98	10.59
#FFFFFF	10.59	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#274372

Deuteranopia (green-blind)

#183B6F

Tritanopia (blue-blind)

#004B52

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #183f70;
/* rgb */ color: rgb(24, 63, 112);
/* oklch */ color: oklch(36.8% 0.095 255.7);

Tailwind

colors: {
  custom: {
    50: '#637399',
    500: '#183f70',
    950: '#000000',
  },
}

SCSS

$custom: #183f70;
$custom-light: #637399;
$custom-dark: #000000;

JSON

{
  "hex": "#183f70",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 112
  },
  "hsl": {
    "h": 213.409,
    "s": 64.706,
    "l": 26.667
  },
  "oklch": {
    "l": 0.36766,
    "c": 0.09523,
    "h": 255.7
  },
  "luminance": 0.04919
}

Semantic roles & 50–950 ramp

primary

#183F70

secondary

#A5783E

accent

#9D40E8

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080E

muted

#7A7B7E

Preview Lab

Preview with #183F70

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

Preview Lab → · Contrast checker → · Palette generator →