#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
RGB	rgb(24, 59, 129)
HSL	hsl(220, 69%, 30%)
HSV	hsv(220, 81%, 51%)
CMYK	cmyk(81.4%, 54.3%, 0%, 49.4%)
CIE-LAB	lab(26.47, 14.95, -43.07)
CIE-LCH	lch(26.47, 45.59, 289.14°)
OKLab	oklab(37.12% -0.017 -0.1241)
OKLCH	oklch(37.12% 0.125 262.2)
XYZ	xyz(5.9017, 4.9064, 21.4006)
Luminance	0.0491 (WCAG relative)
Temperature	cool
Family	blue

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
##183B81	1.00	10.60	1.98	10.60
#FFFFFF	10.60	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.60	1.00	21.00	1.00

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 →