#10303B#10303B

#10303B is a dark, muted cyan. Relative luminance 0.025; OKLCH L 29.1% C 0.042 H 223.8°. Best body text is #FFFFFF at 13.93:1 contrast (WCAG AA passes).

Color values

HEX	#10303B
RGB	rgb(16, 48, 59)
HSL	hsl(195, 57%, 15%)
HSV	hsv(195, 73%, 23%)
CMYK	cmyk(72.9%, 18.6%, 0%, 76.9%)
CIE-LAB	lab(18.10, -7.57, -10.46)
CIE-LCH	lch(18.10, 12.91, 234.09°)
OKLab	oklab(29.09% -0.0304 -0.0291)
OKLCH	oklch(29.09% 0.042 223.8)
XYZ	xyz(2.0597, 2.5396, 4.5185)
Luminance	0.0254 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#10303B #3B1B10

analogous

#103B31 #10303B #101B3B

triadic

#10303B #3B1030 #303B10

tetradic

#10303B #31103B #3B1B10 #1B3B10

square

#10303B #31103B #3B1B10 #1B3B10

split-complementary

#10303B #3B101B #3B3110

monochromatic

#071418 #071418 #10303B #1D576B #2A7E9B

Accessibility & contrast

On white

13.93

#10303B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.51

#10303B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #10303B

13.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##10303B	#FFFFFF	#000000	##FFFFFF
##10303B	1.00	13.93	1.51	13.93
#FFFFFF	13.93	1.00	21.00	1.00
#000000	1.51	21.00	1.00	21.00
##FFFFFF	13.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2A2F3C

Deuteranopia (green-blind)

#242A3B

Tritanopia (blue-blind)

#003334

Achromatopsia (no color)

#2C2C2C

Design tokens & code

CSS

--color: #10303b;
/* rgb */ color: rgb(16, 48, 59);
/* oklch */ color: oklch(29.1% 0.042 223.8);

Tailwind

colors: {
  custom: {
    50: '#546871',
    500: '#10303b',
    950: '#000000',
  },
}

SCSS

$custom: #10303b;
$custom-light: #546871;
$custom-dark: #000000;

JSON

{
  "hex": "#10303b",
  "rgb": {
    "r": 16,
    "g": 48,
    "b": 59
  },
  "hsl": {
    "h": 195.349,
    "s": 57.333,
    "l": 14.706
  },
  "oklch": {
    "l": 0.29085,
    "c": 0.04212,
    "h": 223.8
  },
  "luminance": 0.0254
}

Semantic roles & 50–950 ramp

primary

#10303B

secondary

#754332

accent

#6E47E1

background

#F5F6F6

surface

#E9EBEC

border

#C5C6C7

text

#030607

muted

#787A7A

Preview Lab

Preview with #10303B

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

Preview Lab → · Contrast checker → · Palette generator →