#183B81#183B81

#183B81 is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.1% C 0.125 H 262.2°. Best body text is #FFFFFF at 10.60:1 contrast (WCAG AA passes).

Color values

HEX#183B81
RGBrgb(24, 59, 129)
HSLhsl(220, 69%, 30%)
HSVhsv(220, 81%, 51%)
CMYKcmyk(81.4%, 54.3%, 0%, 49.4%)
CIE-LABlab(26.47, 14.95, -43.07)
CIE-LCHlch(26.47, 45.59, 289.14°)
OKLaboklab(37.12% -0.017 -0.1241)
OKLCHoklch(37.12% 0.125 262.2)
XYZxyz(5.9017, 4.9064, 21.4006)
Luminance0.0491 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#183B81 #815E18
analogous
#186F81 #183B81 #2A1881
triadic
#183B81 #81183B #3B8118
tetradic
#183B81 #81186F #815E18 #18812A
square
#183B81 #81186F #815E18 #18812A
split-complementary
#183B81 #812A18 #6F8118
monochromatic
#050C1A #0E234D #183B81 #2253B5 #396FDA

Accessibility & contrast

On white

10.60
#183B81 on #FFFFFF
AA ✓AA large ✓AAA ✓

On black

1.98
#183B81 on #000000
AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B81
10.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##183B81#FFFFFF#000000##FFFFFF
##183B811.0010.601.9810.60
#FFFFFF10.601.0021.001.00
#0000001.9821.001.0021.00
##FFFFFF10.601.0021.001.00

Color blindness preview

Protanopia (red-blind)
#084483
Deuteranopia (green-blind)
#003A80
Tritanopia (blue-blind)
#004C58
Achromatopsia (no color)
#3F3F3F

Design tokens & code

CSS
--color: #183b81;
/* rgb */ color: rgb(24, 59, 129);
/* oklch */ color: oklch(37.1% 0.125 262.2);
Tailwind
colors: {
  custom: {
    50: '#6770a6',
    500: '#183b81',
    950: '#000000',
  },
}
SCSS
$custom: #183b81;
$custom-light: #6770a6;
$custom-dark: #000000;
JSON
{
  "hex": "#183b81",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 129
  },
  "hsl": {
    "h": 220,
    "s": 68.627,
    "l": 30
  },
  "oklch": {
    "l": 0.37123,
    "c": 0.12525,
    "h": 262.2
  },
  "luminance": 0.04907
}

Semantic roles & 50–950 ramp

primary
#183B81
secondary
#B58E40
accent
#B13CEB
background
#F6F6FA
surface
#EBECF4
border
#C6C7CE
text
#07070F
muted
#7A7A7F

Preview Lab

Preview with #183B81

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

Preview Lab → · Contrast checker → · Palette generator →

#183B81 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva