#183D8F#183D8F

#183D8F is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.7% C 0.143 H 263.1°. Best body text is #FFFFFF at 9.99:1 contrast (WCAG AA passes).

Color values

HEX	#183D8F
RGB	rgb(24, 61, 143)
HSL	hsl(221, 71%, 33%)
HSV	hsv(221, 83%, 56%)
CMYK	cmyk(83.2%, 57.3%, 0%, 43.9%)
CIE-LAB	lab(28.15, 19.29, -49.02)
CIE-LCH	lch(28.15, 52.68, 291.48°)
OKLab	oklab(38.75% -0.0171 -0.1416)
OKLCH	oklch(38.75% 0.143 263.1)
XYZ	xyz(7.0016, 5.5140, 26.6766)
Luminance	0.0551 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D8F #8F6A18

analogous

#18788F #183D8F #2F188F

triadic

#183D8F #8F183D #3D8F18

tetradic

#183D8F #8F1878 #8F6A18 #188F2F

square

#183D8F #8F1878 #8F6A18 #188F2F

split-complementary

#183D8F #8F2F18 #788F18

monochromatic

#061026 #0F275B #183D8F #2153C3 #4273DF

Accessibility & contrast

On white

9.99

#183D8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#183D8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D8F

9.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D8F	#FFFFFF	#000000	##FFFFFF
##183D8F	1.00	9.99	2.10	9.99
#FFFFFF	9.99	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	9.99	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004892

Deuteranopia (green-blind)

#003D8D

Tritanopia (blue-blind)

#005160

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #183d8f;
/* rgb */ color: rgb(24, 61, 143);
/* oklch */ color: oklch(38.7% 0.143 263.1);

Tailwind

colors: {
  custom: {
    50: '#6b71b0',
    500: '#183d8f',
    950: '#000000',
  },
}

SCSS

$custom: #183d8f;
$custom-light: #6b71b0;
$custom-dark: #000000;

JSON

{
  "hex": "#183d8f",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 143
  },
  "hsl": {
    "h": 221.345,
    "s": 71.257,
    "l": 32.745
  },
  "oklch": {
    "l": 0.38748,
    "c": 0.1426,
    "h": 263.1
  },
  "luminance": 0.05515
}

Semantic roles & 50–950 ramp

primary

#183D8F

secondary

#C09943

accent

#B63AEE

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080711

muted

#7A7A80

Preview Lab

Preview with #183D8F

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

Preview Lab → · Contrast checker → · Palette generator →