#10183B#10183B

#10183B is a very dark, moderate blue. Relative luminance 0.011; OKLCH L 22.5% C 0.068 H 270.4°. Best body text is #FFFFFF at 17.27:1 contrast (WCAG AA passes).

Color values

HEX	#10183B
RGB	rgb(16, 24, 59)
HSL	hsl(229, 57%, 15%)
HSV	hsv(229, 73%, 23%)
CMYK	cmyk(72.9%, 59.3%, 0%, 76.9%)
CIE-LAB	lab(9.63, 9.98, -23.78)
CIE-LCH	lch(9.63, 25.79, 292.77°)
OKLab	oklab(22.47% 0.0004 -0.0682)
OKLCH	oklch(22.47% 0.068 270.4)
XYZ	xyz(1.3295, 1.0791, 4.2750)
Luminance	0.0108 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#10183B #3B3310

analogous

#102E3B #10183B #1E103B

triadic

#10183B #3B1018 #183B10

tetradic

#10183B #3B102E #3B3310 #103B1E

square

#10183B #3B102E #3B3310 #103B1E

split-complementary

#10183B #3B1E10 #2E3B10

monochromatic

#070A18 #070A18 #10183B #1D2C6B #2A3F9B

Accessibility & contrast

On white

17.27

#10183B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.22

#10183B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #10183B

17.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##10183B	#FFFFFF	#000000	##FFFFFF
##10183B	1.00	17.27	1.22	17.27
#FFFFFF	17.27	1.00	21.00	1.00
#000000	1.22	21.00	1.00	21.00
##FFFFFF	17.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#051D3C

Deuteranopia (green-blind)

#00193A

Tritanopia (blue-blind)

#002026

Achromatopsia (no color)

#1B1B1B

Design tokens & code

CSS

--color: #10183b;
/* rgb */ color: rgb(16, 24, 59);
/* oklch */ color: oklch(22.5% 0.068 270.4);

Tailwind

colors: {
  custom: {
    50: '#545471',
    500: '#10183b',
    950: '#000000',
  },
}

SCSS

$custom: #10183b;
$custom-light: #545471;
$custom-dark: #000000;

JSON

{
  "hex": "#10183b",
  "rgb": {
    "r": 16,
    "g": 24,
    "b": 59
  },
  "hsl": {
    "h": 228.837,
    "s": 57.333,
    "l": 14.706
  },
  "oklch": {
    "l": 0.22472,
    "c": 0.06817,
    "h": 270.4
  },
  "luminance": 0.01079
}

Semantic roles & 50–950 ramp

primary

#10183B

secondary

#756832

accent

#C447E1

background

#F5F4F6

surface

#E8E7EC

border

#C4C3C7

text

#030207

muted

#78787A

Preview Lab

Preview with #10183B

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

Preview Lab → · Contrast checker → · Palette generator →