#183D79#183D79

#183D79 is a dark, moderate blue. Relative luminance 0.049; OKLCH L 36.9% C 0.111 H 259.7°. Best body text is #FFFFFF at 10.59:1 contrast (WCAG AA passes).

Color values

HEX	#183D79
RGB	rgb(24, 61, 121)
HSL	hsl(217, 67%, 28%)
HSV	hsv(217, 80%, 47%)
CMYK	cmyk(80.2%, 49.6%, 0%, 52.5%)
CIE-LAB	lab(26.48, 10.23, -38.01)
CIE-LCH	lch(26.48, 39.37, 285.07°)
OKLab	oklab(36.95% -0.0198 -0.1092)
OKLCH	oklch(36.95% 0.111 259.7)
XYZ	xyz(5.4954, 4.9115, 18.7438)
Luminance	0.0491 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D79 #795418

analogous

#186D79 #183D79 #231879

triadic

#183D79 #79183D #3D7918

tetradic

#183D79 #79186D #795418 #187923

square

#183D79 #79186D #795418 #187923

split-complementary

#183D79 #792318 #6D7918

monochromatic

#050D1A #0E2346 #183D79 #2257AC #3572D7

Accessibility & contrast

On white

10.59

#183D79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#183D79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D79

10.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D79	#FFFFFF	#000000	##FFFFFF
##183D79	1.00	10.59	1.98	10.59
#FFFFFF	10.59	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C437B

Deuteranopia (green-blind)

#003A78

Tritanopia (blue-blind)

#004B55

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #183d79;
/* rgb */ color: rgb(24, 61, 121);
/* oklch */ color: oklch(36.9% 0.111 259.7);

Tailwind

colors: {
  custom: {
    50: '#6571a0',
    500: '#183d79',
    950: '#000000',
  },
}

SCSS

$custom: #183d79;
$custom-light: #6571a0;
$custom-dark: #000000;

JSON

{
  "hex": "#183d79",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 121
  },
  "hsl": {
    "h": 217.113,
    "s": 66.897,
    "l": 28.431
  },
  "oklch": {
    "l": 0.36946,
    "c": 0.11096,
    "h": 259.7
  },
  "luminance": 0.04912
}

Semantic roles & 50–950 ramp

primary

#183D79

secondary

#AE843F

accent

#A83EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070F

muted

#7A7A7E

Preview Lab

Preview with #183D79

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

Preview Lab → · Contrast checker → · Palette generator →