#183F8B#183F8B

#183F8B is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.8% C 0.134 H 261.9°. Best body text is #FFFFFF at 9.89:1 contrast (WCAG AA passes).

Color values

HEX	#183F8B
RGB	rgb(24, 63, 139)
HSL	hsl(220, 71%, 32%)
HSV	hsv(220, 83%, 55%)
CMYK	cmyk(82.7%, 54.7%, 0%, 45.5%)
CIE-LAB	lab(28.41, 16.26, -46.13)
CIE-LCH	lch(28.41, 48.91, 289.42°)
OKLab	oklab(38.85% -0.0189 -0.133)
OKLCH	oklch(38.85% 0.134 261.9)
XYZ	xyz(6.8127, 5.6125, 25.1453)
Luminance	0.0561 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F8B #8B6418

analogous

#18798B #183F8B #2B188B

triadic

#183F8B #8B183F #3F8B18

tetradic

#183F8B #8B1879 #8B6418 #188B2B

square

#183F8B #8B1879 #8B6418 #188B2B

split-complementary

#183F8B #8B2B18 #798B18

monochromatic

#061023 #0F2757 #183F8B #2157BF #3F75DE

Accessibility & contrast

On white

9.89

#183F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#183F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F8B

9.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F8B	#FFFFFF	#000000	##FFFFFF
##183F8B	1.00	9.89	2.12	9.89
#FFFFFF	9.89	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#03498E

Deuteranopia (green-blind)

#003E8A

Tritanopia (blue-blind)

#00525E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #183f8b;
/* rgb */ color: rgb(24, 63, 139);
/* oklch */ color: oklch(38.8% 0.134 261.9);

Tailwind

colors: {
  custom: {
    50: '#6973ad',
    500: '#183f8b',
    950: '#000000',
  },
}

SCSS

$custom: #183f8b;
$custom-light: #6973ad;
$custom-dark: #000000;

JSON

{
  "hex": "#183f8b",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 139
  },
  "hsl": {
    "h": 219.652,
    "s": 70.552,
    "l": 31.961
  },
  "oklch": {
    "l": 0.38846,
    "c": 0.13436,
    "h": 261.9
  },
  "luminance": 0.05613
}

Semantic roles & 50–950 ramp

primary

#183F8B

secondary

#BE9440

accent

#B13AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #183F8B

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

Preview Lab → · Contrast checker → · Palette generator →