#183F64#183F64

#183F64 is a dark, moderate cyan. Relative luminance 0.047; OKLCH L 36.0% C 0.078 H 249.9°. Best body text is #FFFFFF at 10.86:1 contrast (WCAG AA passes).

Color values

HEX	#183F64
RGB	rgb(24, 63, 100)
HSL	hsl(209, 61%, 24%)
HSV	hsv(209, 76%, 39%)
CMYK	cmyk(76%, 37%, 0%, 60.8%)
CIE-LAB	lab(25.77, 0.22, -25.76)
CIE-LCH	lch(25.77, 25.76, 270.48°)
OKLab	oklab(35.96% -0.0268 -0.0732)
OKLCH	oklch(35.96% 0.078 249.9)
XYZ	xyz(4.4536, 4.6688, 12.7206)
Luminance	0.0467 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F64 #643D18

analogous

#186463 #183F64 #181964

triadic

#183F64 #64183F #3F6418

tetradic

#183F64 #631864 #643D18 #196418

square

#183F64 #631864 #643D18 #196418

split-complementary

#183F64 #641819 #646318

monochromatic

#061019 #0C2033 #183F64 #245E95 #307DC7

Accessibility & contrast

On white

10.86

#183F64 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#183F64 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F64

10.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F64	#FFFFFF	#000000	##FFFFFF
##183F64	1.00	10.86	1.93	10.86
#FFFFFF	10.86	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E4166

Deuteranopia (green-blind)

#233A63

Tritanopia (blue-blind)

#00484C

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #183f64;
/* rgb */ color: rgb(24, 63, 100);
/* oklch */ color: oklch(36.0% 0.078 249.9);

Tailwind

colors: {
  custom: {
    50: '#607390',
    500: '#183f64',
    950: '#000000',
  },
}

SCSS

$custom: #183f64;
$custom-light: #607390;
$custom-dark: #000000;

JSON

{
  "hex": "#183f64",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 100
  },
  "hsl": {
    "h": 209.211,
    "s": 61.29,
    "l": 24.314
  },
  "oklch": {
    "l": 0.35957,
    "c": 0.0779,
    "h": 249.9
  },
  "luminance": 0.04669
}

Semantic roles & 50–950 ramp

primary

#183F64

secondary

#9A6B3E

accent

#9243E4

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05080C

muted

#797B7D

Preview Lab

Preview with #183F64

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

Preview Lab → · Contrast checker → · Palette generator →