#183A8A#183A8A

#183A8A is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.7% C 0.139 H 263.6°. Best body text is #FFFFFF at 10.44:1 contrast (WCAG AA passes).

Color values

HEX	#183A8A
RGB	rgb(24, 58, 138)
HSL	hsl(222, 70%, 32%)
HSV	hsv(222, 83%, 54%)
CMYK	cmyk(82.6%, 58%, 0%, 45.9%)
CIE-LAB	lab(26.89, 19.34, -47.99)
CIE-LCH	lch(26.89, 51.74, 291.96°)
OKLab	oklab(37.67% -0.0154 -0.1386)
OKLCH	oklch(37.67% 0.139 263.6)
XYZ	xyz(6.4756, 5.0545, 24.6742)
Luminance	0.0505 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A8A #8A6818

analogous

#18738A #183A8A #2F188A

triadic

#183A8A #8A183A #3A8A18

tetradic

#183A8A #8A1873 #8A6818 #188A2F

square

#183A8A #8A1873 #8A6818 #188A2F

split-complementary

#183A8A #8A2F18 #738A18

monochromatic

#060E22 #0F2456 #183A8A #2150BE #3F6EDE

Accessibility & contrast

On white

10.44

#183A8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#183A8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A8A

10.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A8A	#FFFFFF	#000000	##FFFFFF
##183A8A	1.00	10.44	2.01	10.44
#FFFFFF	10.44	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458D

Deuteranopia (green-blind)

#003B88

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183a8a;
/* rgb */ color: rgb(24, 58, 138);
/* oklch */ color: oklch(37.7% 0.139 263.6);

Tailwind

colors: {
  custom: {
    50: '#6a6fad',
    500: '#183a8a',
    950: '#000000',
  },
}

SCSS

$custom: #183a8a;
$custom-light: #6a6fad;
$custom-dark: #000000;

JSON

{
  "hex": "#183a8a",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 138
  },
  "hsl": {
    "h": 222.105,
    "s": 70.37,
    "l": 31.765
  },
  "oklch": {
    "l": 0.37668,
    "c": 0.13944,
    "h": 263.6
  },
  "luminance": 0.05055
}

Semantic roles & 50–950 ramp

primary

#183A8A

secondary

#BD9840

accent

#B83BED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #183A8A

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

Preview Lab → · Contrast checker → · Palette generator →