#183E81#183E81

#183E81 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 37.8% C 0.121 H 260.8°. Best body text is #FFFFFF at 10.27:1 contrast (WCAG AA passes).

Color values

HEX	#183E81
RGB	rgb(24, 62, 129)
HSL	hsl(218, 69%, 30%)
HSV	hsv(218, 81%, 51%)
CMYK	cmyk(81.4%, 51.9%, 0%, 49.4%)
CIE-LAB	lab(27.36, 12.84, -41.62)
CIE-LCH	lch(27.36, 43.55, 287.15°)
OKLab	oklab(37.81% -0.0194 -0.1198)
OKLCH	oklch(37.81% 0.121 260.8)
XYZ	xyz(6.0603, 5.2237, 21.4535)
Luminance	0.0522 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183E81 #815B18

analogous

#187281 #183E81 #271881

triadic

#183E81 #81183E #3E8118

tetradic

#183E81 #811872 #815B18 #188127

square

#183E81 #811872 #815B18 #188127

split-complementary

#183E81 #812718 #728118

monochromatic

#050C1A #0E254D #183E81 #2257B5 #3973DA

Accessibility & contrast

On white

10.27

#183E81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#183E81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183E81

10.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183E81	#FFFFFF	#000000	##FFFFFF
##183E81	1.00	10.27	2.04	10.27
#FFFFFF	10.27	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#144683

Deuteranopia (green-blind)

#003C80

Tritanopia (blue-blind)

#004E59

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #183e81;
/* rgb */ color: rgb(24, 62, 129);
/* oklch */ color: oklch(37.8% 0.121 260.8);

Tailwind

colors: {
  custom: {
    50: '#6772a6',
    500: '#183e81',
    950: '#000000',
  },
}

SCSS

$custom: #183e81;
$custom-light: #6772a6;
$custom-dark: #000000;

JSON

{
  "hex": "#183e81",
  "rgb": {
    "r": 24,
    "g": 62,
    "b": 129
  },
  "hsl": {
    "h": 218.286,
    "s": 68.627,
    "l": 30
  },
  "oklch": {
    "l": 0.37806,
    "c": 0.12132,
    "h": 260.8
  },
  "luminance": 0.05224
}

Semantic roles & 50–950 ramp

primary

#183E81

secondary

#B58B40

accent

#AC3CEB

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #183E81

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

Preview Lab → · Contrast checker → · Palette generator →