#183F63#183F63

#183F63 is a dark, moderate cyan. Relative luminance 0.046; OKLCH L 35.9% C 0.076 H 249.3°. Best body text is #FFFFFF at 10.88:1 contrast (WCAG AA passes).

Color values

HEX	#183F63
RGB	rgb(24, 63, 99)
HSL	hsl(209, 61%, 24%)
HSV	hsv(209, 76%, 39%)
CMYK	cmyk(75.8%, 36.4%, 0%, 61.2%)
CIE-LAB	lab(25.71, -0.19, -25.20)
CIE-LCH	lch(25.71, 25.20, 269.57°)
OKLab	oklab(35.89% -0.0271 -0.0715)
OKLCH	oklch(35.89% 0.076 249.3)
XYZ	xyz(4.4055, 4.6496, 12.4672)
Luminance	0.0465 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F63 #633C18

analogous

#186362 #183F63 #181A63

triadic

#183F63 #63183F #3F6318

tetradic

#183F63 #621863 #633C18 #1A6318

square

#183F63 #621863 #633C18 #1A6318

split-complementary

#183F63 #63181A #636218

monochromatic

#061019 #0C2032 #183F63 #245E94 #307EC6

Accessibility & contrast

On white

10.88

#183F63 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#183F63 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F63

10.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F63	#FFFFFF	#000000	##FFFFFF
##183F63	1.00	10.88	1.93	10.88
#FFFFFF	10.88	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F4165

Deuteranopia (green-blind)

#243A62

Tritanopia (blue-blind)

#00484C

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #183f63;
/* rgb */ color: rgb(24, 63, 99);
/* oklch */ color: oklch(35.9% 0.076 249.3);

Tailwind

colors: {
  custom: {
    50: '#60738f',
    500: '#183f63',
    950: '#000000',
  },
}

SCSS

$custom: #183f63;
$custom-light: #60738f;
$custom-dark: #000000;

JSON

{
  "hex": "#183f63",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 99
  },
  "hsl": {
    "h": 208.8,
    "s": 60.976,
    "l": 24.118
  },
  "oklch": {
    "l": 0.35893,
    "c": 0.07649,
    "h": 249.3
  },
  "luminance": 0.0465
}

Semantic roles & 50–950 ramp

primary

#183F63

secondary

#996A3E

accent

#9144E4

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05080C

muted

#797B7D

Preview Lab

Preview with #183F63

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

Preview Lab → · Contrast checker → · Palette generator →