#0A183A#0A183A

#0A183A is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 22.0% C 0.069 H 264.6°. Best body text is #FFFFFF at 17.43:1 contrast (WCAG AA passes).

Color values

HEX	#0A183A
RGB	rgb(10, 24, 58)
HSL	hsl(223, 71%, 13%)
HSV	hsv(223, 83%, 23%)
CMYK	cmyk(82.8%, 58.6%, 0%, 77.3%)
CIE-LAB	lab(9.18, 8.37, -23.81)
CIE-LCH	lch(9.18, 25.24, 289.37°)
OKLab	oklab(22% -0.0065 -0.0684)
OKLCH	oklch(22% 0.069 264.6)
XYZ	xyz(1.2153, 1.0232, 4.1356)
Luminance	0.0102 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#0A183A #3A2C0A

analogous

#0A303A #0A183A #140A3A

triadic

#0A183A #3A0A18 #183A0A

tetradic

#0A183A #3A0A30 #3A2C0A #0A3A14

square

#0A183A #3A0A30 #3A2C0A #0A3A14

split-complementary

#0A183A #3A140A #303A0A

monochromatic

#050B1A #050B1A #0A183A #132E6E #1C43A2

Accessibility & contrast

On white

17.43

#0A183A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.20

#0A183A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #0A183A

17.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##0A183A	#FFFFFF	#000000	##FFFFFF
##0A183A	1.00	17.43	1.20	17.43
#FFFFFF	17.43	1.00	21.00	1.00
#000000	1.20	21.00	1.00	21.00
##FFFFFF	17.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#051C3B

Deuteranopia (green-blind)

#001839

Tritanopia (blue-blind)

#002026

Achromatopsia (no color)

#1A1A1A

Design tokens & code

CSS

--color: #0a183a;
/* rgb */ color: rgb(10, 24, 58);
/* oklch */ color: oklch(22.0% 0.069 264.6);

Tailwind

colors: {
  custom: {
    50: '#515470',
    500: '#0a183a',
    950: '#000000',
  },
}

SCSS

$custom: #0a183a;
$custom-light: #515470;
$custom-dark: #000000;

JSON

{
  "hex": "#0a183a",
  "rgb": {
    "r": 10,
    "g": 24,
    "b": 58
  },
  "hsl": {
    "h": 222.5,
    "s": 70.588,
    "l": 13.333
  },
  "oklch": {
    "l": 0.22004,
    "c": 0.06872,
    "h": 264.6
  },
  "luminance": 0.01023
}

Semantic roles & 50–950 ramp

primary

#0A183A

secondary

#776028

accent

#B93AED

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020207

muted

#78787A

Preview Lab

Preview with #0A183A

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

Preview Lab → · Contrast checker → · Palette generator →