#183F8A#183F8A

#183F8A is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.8% C 0.133 H 261.8°. Best body text is #FFFFFF at 9.92:1 contrast (WCAG AA passes).

Color values

HEX	#183F8A
RGB	rgb(24, 63, 138)
HSL	hsl(219, 70%, 32%)
HSV	hsv(219, 83%, 54%)
CMYK	cmyk(82.6%, 54.3%, 0%, 45.9%)
CIE-LAB	lab(28.34, 15.85, -45.64)
CIE-LCH	lch(28.34, 48.31, 289.15°)
OKLab	oklab(38.76% -0.019 -0.1316)
OKLCH	oklch(38.76% 0.133 261.8)
XYZ	xyz(6.7400, 5.5834, 24.7623)
Luminance	0.0558 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F8A #8A6318

analogous

#18788A #183F8A #2A188A

triadic

#183F8A #8A183F #3F8A18

tetradic

#183F8A #8A1878 #8A6318 #188A2A

square

#183F8A #8A1878 #8A6318 #188A2A

split-complementary

#183F8A #8A2A18 #788A18

monochromatic

#060F22 #0F2756 #183F8A #2157BE #3F75DE

Accessibility & contrast

On white

9.92

#183F8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#183F8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F8A

9.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F8A	#FFFFFF	#000000	##FFFFFF
##183F8A	1.00	9.92	2.12	9.92
#FFFFFF	9.92	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#05488D

Deuteranopia (green-blind)

#003E89

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #183f8a;
/* rgb */ color: rgb(24, 63, 138);
/* oklch */ color: oklch(38.8% 0.133 261.8);

Tailwind

colors: {
  custom: {
    50: '#6973ad',
    500: '#183f8a',
    950: '#000000',
  },
}

SCSS

$custom: #183f8a;
$custom-light: #6973ad;
$custom-dark: #000000;

JSON

{
  "hex": "#183f8a",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 138
  },
  "hsl": {
    "h": 219.474,
    "s": 70.37,
    "l": 31.765
  },
  "oklch": {
    "l": 0.38763,
    "c": 0.13294,
    "h": 261.8
  },
  "luminance": 0.05584
}

Semantic roles & 50–950 ramp

primary

#183F8A

secondary

#BD9340

accent

#B03BED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #183F8A

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

Preview Lab → · Contrast checker → · Palette generator →