#183F81#183F81

#183F81 is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.0% C 0.120 H 260.3°. Best body text is #FFFFFF at 10.16:1 contrast (WCAG AA passes).

Color values

HEX	#183F81
RGB	rgb(24, 63, 129)
HSL	hsl(218, 69%, 30%)
HSV	hsv(218, 81%, 51%)
CMYK	cmyk(81.4%, 51.2%, 0%, 49.4%)
CIE-LAB	lab(27.66, 12.14, -41.13)
CIE-LCH	lch(27.66, 42.88, 286.45°)
OKLab	oklab(38.04% -0.0202 -0.1183)
OKLCH	oklch(38.04% 0.12 260.3)
XYZ	xyz(6.1152, 5.3335, 21.4718)
Luminance	0.0533 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F81 #815A18

analogous

#187481 #183F81 #251881

triadic

#183F81 #81183F #3F8118

tetradic

#183F81 #811874 #815A18 #188125

square

#183F81 #811874 #815A18 #188125

split-complementary

#183F81 #812518 #748118

monochromatic

#050D1A #0E264D #183F81 #2258B5 #3975DA

Accessibility & contrast

On white

10.16

#183F81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.07

#183F81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F81

10.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F81	#FFFFFF	#000000	##FFFFFF
##183F81	1.00	10.16	2.07	10.16
#FFFFFF	10.16	1.00	21.00	1.00
#000000	2.07	21.00	1.00	21.00
##FFFFFF	10.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#174683

Deuteranopia (green-blind)

#003D80

Tritanopia (blue-blind)

#004F5A

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #183f81;
/* rgb */ color: rgb(24, 63, 129);
/* oklch */ color: oklch(38.0% 0.120 260.3);

Tailwind

colors: {
  custom: {
    50: '#6773a6',
    500: '#183f81',
    950: '#000000',
  },
}

SCSS

$custom: #183f81;
$custom-light: #6773a6;
$custom-dark: #000000;

JSON

{
  "hex": "#183f81",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 129
  },
  "hsl": {
    "h": 217.714,
    "s": 68.627,
    "l": 30
  },
  "oklch": {
    "l": 0.38037,
    "c": 0.12003,
    "h": 260.3
  },
  "luminance": 0.05334
}

Semantic roles & 50–950 ramp

primary

#183F81

secondary

#B58A40

accent

#AA3CEB

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #183F81

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

Preview Lab → · Contrast checker → · Palette generator →