#0A173A#0A173A

#0A173A is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 21.7% C 0.070 H 265.5°. Best body text is #FFFFFF at 17.55:1 contrast (WCAG AA passes).

Color values

HEX	#0A173A
RGB	rgb(10, 23, 58)
HSL	hsl(224, 71%, 13%)
HSV	hsv(224, 83%, 23%)
CMYK	cmyk(82.8%, 60.3%, 0%, 77.3%)
CIE-LAB	lab(8.85, 9.17, -24.35)
CIE-LCH	lch(8.85, 26.02, 290.63°)
OKLab	oklab(21.75% -0.0055 -0.07)
OKLCH	oklch(21.75% 0.07 265.5)
XYZ	xyz(1.1950, 0.9827, 4.1289)
Luminance	0.0098 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#0A173A #3A2D0A

analogous

#0A2F3A #0A173A #150A3A

triadic

#0A173A #3A0A17 #173A0A

tetradic

#0A173A #3A0A2F #3A2D0A #0A3A15

square

#0A173A #3A0A2F #3A2D0A #0A3A15

split-complementary

#0A173A #3A150A #2F3A0A

monochromatic

#050A1A #050A1A #0A173A #132C6E #1C40A2

Accessibility & contrast

On white

17.55

#0A173A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.20

#0A173A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #0A173A

17.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##0A173A	#FFFFFF	#000000	##FFFFFF
##0A173A	1.00	17.55	1.20	17.55
#FFFFFF	17.55	1.00	21.00	1.00
#000000	1.20	21.00	1.00	21.00
##FFFFFF	17.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#031B3B

Deuteranopia (green-blind)

#001739

Tritanopia (blue-blind)

#001F25

Achromatopsia (no color)

#191919

Design tokens & code

CSS

--color: #0a173a;
/* rgb */ color: rgb(10, 23, 58);
/* oklch */ color: oklch(21.7% 0.070 265.5);

Tailwind

colors: {
  custom: {
    50: '#515370',
    500: '#0a173a',
    950: '#000000',
  },
}

SCSS

$custom: #0a173a;
$custom-light: #515370;
$custom-dark: #000000;

JSON

{
  "hex": "#0a173a",
  "rgb": {
    "r": 10,
    "g": 23,
    "b": 58
  },
  "hsl": {
    "h": 223.75,
    "s": 70.588,
    "l": 13.333
  },
  "oklch": {
    "l": 0.21748,
    "c": 0.07024,
    "h": 265.5
  },
  "luminance": 0.00983
}

Semantic roles & 50–950 ramp

primary

#0A173A

secondary

#776228

accent

#BD3AED

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020207

muted

#78787A

Preview Lab

Preview with #0A173A

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

Preview Lab → · Contrast checker → · Palette generator →