#0A183B#0A183B

#0A183B is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 22.1% C 0.070 H 264.8°. Best body text is #FFFFFF at 17.40:1 contrast (WCAG AA passes).

Color values

HEX	#0A183B
RGB	rgb(10, 24, 59)
HSL	hsl(223, 71%, 14%)
HSV	hsv(223, 83%, 23%)
CMYK	cmyk(83.1%, 59.3%, 0%, 76.9%)
CIE-LAB	lab(9.27, 8.83, -24.39)
CIE-LCH	lch(9.27, 25.94, 289.89°)
OKLab	oklab(22.09% -0.0064 -0.0701)
OKLCH	oklch(22.09% 0.07 264.8)
XYZ	xyz(1.2409, 1.0334, 4.2709)
Luminance	0.0103 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#0A183B #3B2D0A

analogous

#0A303B #0A183B #140A3B

triadic

#0A183B #3B0A18 #183B0A

tetradic

#0A183B #3B0A30 #3B2D0A #0A3B14

square

#0A183B #3B0A30 #3B2D0A #0A3B14

split-complementary

#0A183B #3B140A #303B0A

monochromatic

#040B1A #040B1A #0A183B #132D6F #1C43A4

Accessibility & contrast

On white

17.40

#0A183B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.21

#0A183B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #0A183B

17.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##0A183B	#FFFFFF	#000000	##FFFFFF
##0A183B	1.00	17.40	1.21	17.40
#FFFFFF	17.40	1.00	21.00	1.00
#000000	1.21	21.00	1.00	21.00
##FFFFFF	17.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#041C3C

Deuteranopia (green-blind)

#00183A

Tritanopia (blue-blind)

#002026

Achromatopsia (no color)

#1A1A1A

Design tokens & code

CSS

--color: #0a183b;
/* rgb */ color: rgb(10, 24, 59);
/* oklch */ color: oklch(22.1% 0.070 264.8);

Tailwind

colors: {
  custom: {
    50: '#515471',
    500: '#0a183b',
    950: '#000000',
  },
}

SCSS

$custom: #0a183b;
$custom-light: #515471;
$custom-dark: #000000;

JSON

{
  "hex": "#0a183b",
  "rgb": {
    "r": 10,
    "g": 24,
    "b": 59
  },
  "hsl": {
    "h": 222.857,
    "s": 71.014,
    "l": 13.529
  },
  "oklch": {
    "l": 0.22094,
    "c": 0.07041,
    "h": 264.8
  },
  "luminance": 0.01034
}

Semantic roles & 50–950 ramp

primary

#0A183B

secondary

#786228

accent

#BA3AEE

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020207

muted

#78787A

Preview Lab

Preview with #0A183B

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

Preview Lab → · Contrast checker → · Palette generator →