#183D81#183D81

#183D81 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.6% C 0.123 H 261.3°. Best body text is #FFFFFF at 10.38:1 contrast (WCAG AA passes).

Color values

HEX	#183D81
RGB	rgb(24, 61, 129)
HSL	hsl(219, 69%, 30%)
HSV	hsv(219, 81%, 51%)
CMYK	cmyk(81.4%, 52.7%, 0%, 49.4%)
CIE-LAB	lab(27.06, 13.54, -42.10)
CIE-LCH	lch(27.06, 44.23, 287.83°)
OKLab	oklab(37.58% -0.0186 -0.1212)
OKLCH	oklch(37.58% 0.123 261.3)
XYZ	xyz(6.0064, 5.1160, 21.4355)
Luminance	0.0512 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D81 #815C18

analogous

#187281 #183D81 #271881

triadic

#183D81 #81183D #3D8118

tetradic

#183D81 #811872 #815C18 #188127

square

#183D81 #811872 #815C18 #188127

split-complementary

#183D81 #812718 #728118

monochromatic

#050C1A #0E254D #183D81 #2255B5 #3972DA

Accessibility & contrast

On white

10.38

#183D81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#183D81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D81

10.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D81	#FFFFFF	#000000	##FFFFFF
##183D81	1.00	10.38	2.02	10.38
#FFFFFF	10.38	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#114583

Deuteranopia (green-blind)

#003B80

Tritanopia (blue-blind)

#004D59

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183d81;
/* rgb */ color: rgb(24, 61, 129);
/* oklch */ color: oklch(37.6% 0.123 261.3);

Tailwind

colors: {
  custom: {
    50: '#6771a6',
    500: '#183d81',
    950: '#000000',
  },
}

SCSS

$custom: #183d81;
$custom-light: #6771a6;
$custom-dark: #000000;

JSON

{
  "hex": "#183d81",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 129
  },
  "hsl": {
    "h": 218.857,
    "s": 68.627,
    "l": 30
  },
  "oklch": {
    "l": 0.37577,
    "c": 0.12263,
    "h": 261.3
  },
  "luminance": 0.05117
}

Semantic roles & 50–950 ramp

primary

#183D81

secondary

#B58C40

accent

#AE3CEB

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #183D81

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

Preview Lab → · Contrast checker → · Palette generator →