#183A8C#183A8C

#183A8C is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.8% C 0.142 H 263.8°. Best body text is #FFFFFF at 10.38:1 contrast (WCAG AA passes).

Color values

HEX	#183A8C
RGB	rgb(24, 58, 140)
HSL	hsl(222, 71%, 32%)
HSV	hsv(222, 83%, 55%)
CMYK	cmyk(82.9%, 58.6%, 0%, 45.1%)
CIE-LAB	lab(27.05, 20.16, -48.96)
CIE-LCH	lch(27.05, 52.95, 292.38°)
OKLab	oklab(37.84% -0.0153 -0.1414)
OKLCH	oklch(37.84% 0.142 263.8)
XYZ	xyz(6.6217, 5.1130, 25.4438)
Luminance	0.0511 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A8C #8C6A18

analogous

#18748C #183A8C #30188C

triadic

#183A8C #8C183A #3A8C18

tetradic

#183A8C #8C1874 #8C6A18 #188C30

square

#183A8C #8C1874 #8C6A18 #188C30

split-complementary

#183A8C #8C3018 #748C18

monochromatic

#060F24 #0F2458 #183A8C #2150C0 #406EDE

Accessibility & contrast

On white

10.38

#183A8C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#183A8C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A8C

10.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A8C	#FFFFFF	#000000	##FFFFFF
##183A8C	1.00	10.38	2.02	10.38
#FFFFFF	10.38	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458F

Deuteranopia (green-blind)

#003B8A

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183a8c;
/* rgb */ color: rgb(24, 58, 140);
/* oklch */ color: oklch(37.8% 0.142 263.8);

Tailwind

colors: {
  custom: {
    50: '#6a6fae',
    500: '#183a8c',
    950: '#000000',
  },
}

SCSS

$custom: #183a8c;
$custom-light: #6a6fae;
$custom-dark: #000000;

JSON

{
  "hex": "#183a8c",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 140
  },
  "hsl": {
    "h": 222.414,
    "s": 70.732,
    "l": 32.157
  },
  "oklch": {
    "l": 0.37844,
    "c": 0.14226,
    "h": 263.8
  },
  "luminance": 0.05114
}

Semantic roles & 50–950 ramp

primary

#183A8C

secondary

#BF9A41

accent

#B93AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #183A8C

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

Preview Lab → · Contrast checker → · Palette generator →