#100C51#100C51

#100C51 is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 22.5% C 0.118 H 273.9°. Best body text is #FFFFFF at 17.60:1 contrast (WCAG AA passes).

Color values

HEX	#100C51
RGB	rgb(16, 12, 81)
HSL	hsl(243, 74%, 18%)
HSV	hsv(243, 85%, 32%)
CMYK	cmyk(80.2%, 85.2%, 0%, 68.2%)
CIE-LAB	lab(8.71, 27.49, -40.71)
CIE-LCH	lch(8.71, 49.12, 304.02°)
OKLab	oklab(22.5% 0.0081 -0.1178)
OKLCH	oklch(22.5% 0.118 273.9)
XYZ	xyz(1.8299, 0.9670, 7.8732)
Luminance	0.0097 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#100C51 #4D510C

analogous

#0C2A51 #100C51 #320C51

triadic

#100C51 #51100C #0C5110

tetradic

#100C51 #510C2A #4D510C #0C5132

square

#100C51 #510C2A #4D510C #0C5132

split-complementary

#100C51 #51320C #2A510C

monochromatic

#05041B #05041C #100C51 #1B1486 #251CBC

Accessibility & contrast

On white

17.60

#100C51 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.19

#100C51 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #100C51

17.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##100C51	#FFFFFF	#000000	##FFFFFF
##100C51	1.00	17.60	1.19	17.60
#FFFFFF	17.60	1.00	21.00	1.00
#000000	1.19	21.00	1.00	21.00
##FFFFFF	17.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001C53

Deuteranopia (green-blind)

#001650

Tritanopia (blue-blind)

#00212E

Achromatopsia (no color)

#191919

Design tokens & code

CSS

--color: #100c51;
/* rgb */ color: rgb(16, 12, 81);
/* oklch */ color: oklch(22.5% 0.118 273.9);

Tailwind

colors: {
  custom: {
    50: '#5b4c83',
    500: '#100c51',
    950: '#000000',
  },
}

SCSS

$custom: #100c51;
$custom-light: #5b4c83;
$custom-dark: #000000;

JSON

{
  "hex": "#100c51",
  "rgb": {
    "r": 16,
    "g": 12,
    "b": 81
  },
  "hsl": {
    "h": 243.478,
    "s": 74.194,
    "l": 18.235
  },
  "oklch": {
    "l": 0.22502,
    "c": 0.11805,
    "h": 273.9
  },
  "luminance": 0.00967
}

Semantic roles & 50–950 ramp

primary

#100C51

secondary

#878C2C

accent

#F137E6

background

#F5F4F8

surface

#E9E7EF

border

#C5C3CA

text

#05010B

muted

#79777C

Preview Lab

Preview with #100C51

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

Preview Lab → · Contrast checker → · Palette generator →