#183B70#183B70

#183B70 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 35.8% C 0.100 H 258.7°. Best body text is #FFFFFF at 11.06:1 contrast (WCAG AA passes).

Color values

HEX	#183B70
RGB	rgb(24, 59, 112)
HSL	hsl(216, 65%, 27%)
HSV	hsv(216, 79%, 44%)
CMYK	cmyk(78.6%, 47.3%, 0%, 56.1%)
CIE-LAB	lab(25.23, 7.90, -34.31)
CIE-LCH	lch(25.23, 35.21, 282.97°)
OKLab	oklab(35.78% -0.0197 -0.0983)
OKLCH	oklch(35.78% 0.1 258.7)
XYZ	xyz(4.8642, 4.4914, 15.9367)
Luminance	0.0449 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B70 #704D18

analogous

#186770 #183B70 #211870

triadic

#183B70 #70183B #3B7018

tetradic

#183B70 #701867 #704D18 #187021

square

#183B70 #701867 #704D18 #187021

split-complementary

#183B70 #702118 #677018

monochromatic

#050D19 #0D203E #183B70 #2356A2 #3071D3

Accessibility & contrast

On white

11.06

#183B70 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#183B70 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B70

11.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B70	#FFFFFF	#000000	##FFFFFF
##183B70	1.00	11.06	1.90	11.06
#FFFFFF	11.06	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#204072

Deuteranopia (green-blind)

#0D386F

Tritanopia (blue-blind)

#004850

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183b70;
/* rgb */ color: rgb(24, 59, 112);
/* oklch */ color: oklch(35.8% 0.100 258.7);

Tailwind

colors: {
  custom: {
    50: '#637099',
    500: '#183b70',
    950: '#000000',
  },
}

SCSS

$custom: #183b70;
$custom-light: #637099;
$custom-dark: #000000;

JSON

{
  "hex": "#183b70",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 112
  },
  "hsl": {
    "h": 216.136,
    "s": 64.706,
    "l": 26.667
  },
  "oklch": {
    "l": 0.35784,
    "c": 0.10027,
    "h": 258.7
  },
  "luminance": 0.04492
}

Semantic roles & 50–950 ramp

primary

#183B70

secondary

#A57C3E

accent

#A540E8

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183B70

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

Preview Lab → · Contrast checker → · Palette generator →