#10173B#10173B

#10173B is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 22.2% C 0.070 H 271.3°. Best body text is #FFFFFF at 17.39:1 contrast (WCAG AA passes).

Color values

HEX	#10173B
RGB	rgb(16, 23, 59)
HSL	hsl(230, 57%, 15%)
HSV	hsv(230, 73%, 23%)
CMYK	cmyk(72.9%, 61%, 0%, 76.9%)
CIE-LAB	lab(9.31, 10.77, -24.30)
CIE-LCH	lch(9.31, 26.58, 293.89°)
OKLab	oklab(22.23% 0.0016 -0.0697)
OKLCH	oklch(22.23% 0.07 271.3)
XYZ	xyz(1.3092, 1.0386, 4.2683)
Luminance	0.0104 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#10173B #3B3410

analogous

#102C3B #10173B #1F103B

triadic

#10173B #3B1017 #173B10

tetradic

#10173B #3B102C #3B3410 #103B1F

square

#10173B #3B102C #3B3410 #103B1F

split-complementary

#10173B #3B1F10 #2C3B10

monochromatic

#070918 #070918 #10173B #1D2A6B #2A3D9B

Accessibility & contrast

On white

17.39

#10173B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.21

#10173B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #10173B

17.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##10173B	#FFFFFF	#000000	##FFFFFF
##10173B	1.00	17.39	1.21	17.39
#FFFFFF	17.39	1.00	21.00	1.00
#000000	1.21	21.00	1.00	21.00
##FFFFFF	17.39	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#031C3C

Deuteranopia (green-blind)

#00183A

Tritanopia (blue-blind)

#001F26

Achromatopsia (no color)

#1A1A1A

Design tokens & code

CSS

--color: #10173b;
/* rgb */ color: rgb(16, 23, 59);
/* oklch */ color: oklch(22.2% 0.070 271.3);

Tailwind

colors: {
  custom: {
    50: '#545371',
    500: '#10173b',
    950: '#000000',
  },
}

SCSS

$custom: #10173b;
$custom-light: #545371;
$custom-dark: #000000;

JSON

{
  "hex": "#10173b",
  "rgb": {
    "r": 16,
    "g": 23,
    "b": 59
  },
  "hsl": {
    "h": 230.233,
    "s": 57.333,
    "l": 14.706
  },
  "oklch": {
    "l": 0.22227,
    "c": 0.06975,
    "h": 271.3
  },
  "luminance": 0.01039
}

Semantic roles & 50–950 ramp

primary

#10173B

secondary

#756A32

accent

#C847E1

background

#F5F4F6

surface

#E9E7EC

border

#C5C3C7

text

#030207

muted

#78787A

Preview Lab

Preview with #10173B

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

Preview Lab → · Contrast checker → · Palette generator →