#183B66#183B66

#183B66 is a dark, moderate cyan. Relative luminance 0.043; OKLCH L 35.1% C 0.085 H 255.1°. Best body text is #FFFFFF at 11.31:1 contrast (WCAG AA passes).

Color values

HEX	#183B66
RGB	rgb(24, 59, 102)
HSL	hsl(213, 62%, 25%)
HSV	hsv(213, 76%, 40%)
CMYK	cmyk(76.5%, 42.2%, 0%, 60%)
CIE-LAB	lab(24.58, 3.77, -28.93)
CIE-LCH	lch(24.58, 29.18, 277.43°)
OKLab	oklab(35.07% -0.0219 -0.0825)
OKLCH	oklch(35.07% 0.085 255.1)
XYZ	xyz(4.3380, 4.2810, 13.1655)
Luminance	0.0428 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B66 #664318

analogous

#186266 #183B66 #1C1866

triadic

#183B66 #66183B #3B6618

tetradic

#183B66 #661862 #664318 #18661C

square

#183B66 #661862 #664318 #18661C

split-complementary

#183B66 #661C18 #626618

monochromatic

#060E19 #0C1E34 #183B66 #245898 #2F74C9

Accessibility & contrast

On white

11.31

#183B66 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#183B66 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B66

11.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B66	#FFFFFF	#000000	##FFFFFF
##183B66	1.00	11.31	1.86	11.31
#FFFFFF	11.31	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#273E68

Deuteranopia (green-blind)

#1B3765

Tritanopia (blue-blind)

#00454B

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183b66;
/* rgb */ color: rgb(24, 59, 102);
/* oklch */ color: oklch(35.1% 0.085 255.1);

Tailwind

colors: {
  custom: {
    50: '#607092',
    500: '#183b66',
    950: '#000000',
  },
}

SCSS

$custom: #183b66;
$custom-light: #607092;
$custom-dark: #000000;

JSON

{
  "hex": "#183b66",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 102
  },
  "hsl": {
    "h": 213.077,
    "s": 61.905,
    "l": 24.706
  },
  "oklch": {
    "l": 0.35065,
    "c": 0.0854,
    "h": 255.1
  },
  "luminance": 0.04281
}

Semantic roles & 50–950 ramp

primary

#183B66

secondary

#9C723E

accent

#9C43E5

background

#F6F6F9

surface

#EBECF1

border

#C6C7CB

text

#05070D

muted

#7A7A7E

Preview Lab

Preview with #183B66

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

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