#183F85#183F85

#183F85 is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.4% C 0.126 H 261.0°. Best body text is #FFFFFF at 10.05:1 contrast (WCAG AA passes).

Color values

HEX	#183F85
RGB	rgb(24, 63, 133)
HSL	hsl(219, 69%, 31%)
HSV	hsv(219, 82%, 52%)
CMYK	cmyk(82%, 52.6%, 0%, 47.8%)
CIE-LAB	lab(27.96, 13.79, -43.15)
CIE-LCH	lch(27.96, 45.30, 287.73°)
OKLab	oklab(38.36% -0.0197 -0.1242)
OKLCH	oklch(38.36% 0.126 261)
XYZ	xyz(6.3863, 5.4419, 22.8996)
Luminance	0.0544 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F85 #855E18

analogous

#187585 #183F85 #271885

triadic

#183F85 #85183F #3F8518

tetradic

#183F85 #851875 #855E18 #188527

square

#183F85 #851875 #855E18 #188527

split-complementary

#183F85 #852718 #758518

monochromatic

#050E1D #0F2651 #183F85 #2158B9 #3C75DC

Accessibility & contrast

On white

10.05

#183F85 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#183F85 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F85

10.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F85	#FFFFFF	#000000	##FFFFFF
##183F85	1.00	10.05	2.09	10.05
#FFFFFF	10.05	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#114788

Deuteranopia (green-blind)

#003D84

Tritanopia (blue-blind)

#00505B

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #183f85;
/* rgb */ color: rgb(24, 63, 133);
/* oklch */ color: oklch(38.4% 0.126 261.0);

Tailwind

colors: {
  custom: {
    50: '#6873a9',
    500: '#183f85',
    950: '#000000',
  },
}

SCSS

$custom: #183f85;
$custom-light: #6873a9;
$custom-dark: #000000;

JSON

{
  "hex": "#183f85",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 133
  },
  "hsl": {
    "h": 218.532,
    "s": 69.427,
    "l": 30.784
  },
  "oklch": {
    "l": 0.38356,
    "c": 0.1258,
    "h": 261
  },
  "luminance": 0.05443
}

Semantic roles & 50–950 ramp

primary

#183F85

secondary

#B98E40

accent

#AD3CEC

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #183F85

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

Preview Lab → · Contrast checker → · Palette generator →