#183B8C#183B8C

#183B8C is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.1% C 0.141 H 263.5°. Best body text is #FFFFFF at 10.28:1 contrast (WCAG AA passes).

Color values

HEX	#183B8C
RGB	rgb(24, 59, 140)
HSL	hsl(222, 71%, 32%)
HSV	hsv(222, 83%, 55%)
CMYK	cmyk(82.9%, 57.9%, 0%, 45.1%)
CIE-LAB	lab(27.34, 19.46, -48.49)
CIE-LCH	lch(27.34, 52.25, 291.87°)
OKLab	oklab(38.06% -0.016 -0.14)
OKLCH	oklch(38.06% 0.141 263.5)
XYZ	xyz(6.6726, 5.2148, 25.4607)
Luminance	0.0522 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B8C #8C6918

analogous

#18758C #183B8C #2F188C

triadic

#183B8C #8C183B #3B8C18

tetradic

#183B8C #8C1875 #8C6918 #188C2F

square

#183B8C #8C1875 #8C6918 #188C2F

split-complementary

#183B8C #8C2F18 #758C18

monochromatic

#060F24 #0F2558 #183B8C #2151C0 #4070DE

Accessibility & contrast

On white

10.28

#183B8C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#183B8C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B8C

10.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B8C	#FFFFFF	#000000	##FFFFFF
##183B8C	1.00	10.28	2.04	10.28
#FFFFFF	10.28	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468F

Deuteranopia (green-blind)

#003B8A

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #183b8c;
/* rgb */ color: rgb(24, 59, 140);
/* oklch */ color: oklch(38.1% 0.141 263.5);

Tailwind

colors: {
  custom: {
    50: '#6a70ae',
    500: '#183b8c',
    950: '#000000',
  },
}

SCSS

$custom: #183b8c;
$custom-light: #6a70ae;
$custom-dark: #000000;

JSON

{
  "hex": "#183b8c",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 140
  },
  "hsl": {
    "h": 221.897,
    "s": 70.732,
    "l": 32.157
  },
  "oklch": {
    "l": 0.38058,
    "c": 0.14096,
    "h": 263.5
  },
  "luminance": 0.05216
}

Semantic roles & 50–950 ramp

primary

#183B8C

secondary

#BF9941

accent

#B73AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #183B8C

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

Preview Lab → · Contrast checker → · Palette generator →