#183F79#183F79

#183F79 is a dark, moderate blue. Relative luminance 0.051; OKLCH L 37.4% C 0.108 H 258.5°. Best body text is #FFFFFF at 10.37:1 contrast (WCAG AA passes).

Color values

HEX	#183F79
RGB	rgb(24, 63, 121)
HSL	hsl(216, 67%, 28%)
HSV	hsv(216, 80%, 47%)
CMYK	cmyk(80.2%, 47.9%, 0%, 52.5%)
CIE-LAB	lab(27.10, 8.84, -37.02)
CIE-LCH	lch(27.10, 38.06, 283.42°)
OKLab	oklab(37.42% -0.0216 -0.1062)
OKLCH	oklch(37.42% 0.108 258.5)
XYZ	xyz(5.6041, 5.1290, 18.7801)
Luminance	0.0513 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F79 #795218

analogous

#186F79 #183F79 #211879

triadic

#183F79 #79183F #3F7918

tetradic

#183F79 #79186F #795218 #187921

square

#183F79 #79186F #795218 #187921

split-complementary

#183F79 #792118 #6F7918

monochromatic

#050D1A #0E2446 #183F79 #225AAC #3576D7

Accessibility & contrast

On white

10.37

#183F79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#183F79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F79

10.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F79	#FFFFFF	#000000	##FFFFFF
##183F79	1.00	10.37	2.03	10.37
#FFFFFF	10.37	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#20457B

Deuteranopia (green-blind)

#083C78

Tritanopia (blue-blind)

#004D56

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183f79;
/* rgb */ color: rgb(24, 63, 121);
/* oklch */ color: oklch(37.4% 0.108 258.5);

Tailwind

colors: {
  custom: {
    50: '#6573a0',
    500: '#183f79',
    950: '#000000',
  },
}

SCSS

$custom: #183f79;
$custom-light: #6573a0;
$custom-dark: #000000;

JSON

{
  "hex": "#183f79",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 121
  },
  "hsl": {
    "h": 215.876,
    "s": 66.897,
    "l": 28.431
  },
  "oklch": {
    "l": 0.37422,
    "c": 0.10838,
    "h": 258.5
  },
  "luminance": 0.0513
}

Semantic roles & 50–950 ramp

primary

#183F79

secondary

#AE813F

accent

#A53EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080F

muted

#7A7B7E

Preview Lab

Preview with #183F79

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

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