#183C8F#183C8F

#183C8F is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.5% C 0.144 H 263.4°. Best body text is #FFFFFF at 10.09:1 contrast (WCAG AA passes).

Color values

HEX	#183C8F
RGB	rgb(24, 60, 143)
HSL	hsl(222, 71%, 33%)
HSV	hsv(222, 83%, 56%)
CMYK	cmyk(83.2%, 58%, 0%, 43.9%)
CIE-LAB	lab(27.87, 19.99, -49.49)
CIE-LCH	lch(27.87, 53.37, 291.99°)
OKLab	oklab(38.53% -0.0165 -0.1429)
OKLCH	oklch(38.53% 0.144 263.4)
XYZ	xyz(6.9487, 5.4082, 26.6589)
Luminance	0.0541 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183C8F #8F6B18

analogous

#18778F #183C8F #30188F

triadic

#183C8F #8F183C #3C8F18

tetradic

#183C8F #8F1877 #8F6B18 #188F30

square

#183C8F #8F1877 #8F6B18 #188F30

split-complementary

#183C8F #8F3018 #778F18

monochromatic

#061026 #0F265B #183C8F #2152C3 #4272DF

Accessibility & contrast

On white

10.09

#183C8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#183C8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183C8F

10.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183C8F	#FFFFFF	#000000	##FFFFFF
##183C8F	1.00	10.09	2.08	10.09
#FFFFFF	10.09	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004792

Deuteranopia (green-blind)

#003D8D

Tritanopia (blue-blind)

#00515F

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #183c8f;
/* rgb */ color: rgb(24, 60, 143);
/* oklch */ color: oklch(38.5% 0.144 263.4);

Tailwind

colors: {
  custom: {
    50: '#6b71b0',
    500: '#183c8f',
    950: '#000000',
  },
}

SCSS

$custom: #183c8f;
$custom-light: #6b71b0;
$custom-dark: #000000;

JSON

{
  "hex": "#183c8f",
  "rgb": {
    "r": 24,
    "g": 60,
    "b": 143
  },
  "hsl": {
    "h": 221.849,
    "s": 71.257,
    "l": 32.745
  },
  "oklch": {
    "l": 0.38534,
    "c": 0.14388,
    "h": 263.4
  },
  "luminance": 0.05409
}

Semantic roles & 50–950 ramp

primary

#183C8F

secondary

#C09A43

accent

#B73AEE

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080711

muted

#7A7A80

Preview Lab

Preview with #183C8F

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

Preview Lab → · Contrast checker → · Palette generator →