#100F51#100F51

#100F51 is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 23.0% C 0.115 H 273.3°. Best body text is #FFFFFF at 17.37:1 contrast (WCAG AA passes).

Color values

HEX	#100F51
RGB	rgb(16, 15, 81)
HSL	hsl(241, 69%, 19%)
HSV	hsv(241, 81%, 32%)
CMYK	cmyk(80.2%, 81.5%, 0%, 68.2%)
CIE-LAB	lab(9.37, 25.62, -39.63)
CIE-LCH	lch(9.37, 47.19, 302.88°)
OKLab	oklab(22.96% 0.0066 -0.1147)
OKLCH	oklch(22.96% 0.115 273.3)
XYZ	xyz(1.8692, 1.0457, 7.8863)
Luminance	0.0105 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#100F51 #50510F

analogous

#0F2F51 #100F51 #310F51

triadic

#100F51 #51100F #0F5110

tetradic

#100F51 #510F2F #50510F #0F5131

square

#100F51 #510F2F #50510F #0F5131

split-complementary

#100F51 #51310F #2F510F

monochromatic

#05051A #06051D #100F51 #1A1985 #2422B8

Accessibility & contrast

On white

17.37

#100F51 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.21

#100F51 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #100F51

17.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##100F51	#FFFFFF	#000000	##FFFFFF
##100F51	1.00	17.37	1.21	17.37
#FFFFFF	17.37	1.00	21.00	1.00
#000000	1.21	21.00	1.00	21.00
##FFFFFF	17.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001D53

Deuteranopia (green-blind)

#001750

Tritanopia (blue-blind)

#00222F

Achromatopsia (no color)

#1A1A1A

Design tokens & code

CSS

--color: #100f51;
/* rgb */ color: rgb(16, 15, 81);
/* oklch */ color: oklch(23.0% 0.115 273.3);

Tailwind

colors: {
  custom: {
    50: '#5b4e83',
    500: '#100f51',
    950: '#000000',
  },
}

SCSS

$custom: #100f51;
$custom-light: #5b4e83;
$custom-dark: #000000;

JSON

{
  "hex": "#100f51",
  "rgb": {
    "r": 16,
    "g": 15,
    "b": 81
  },
  "hsl": {
    "h": 240.909,
    "s": 68.75,
    "l": 18.824
  },
  "oklch": {
    "l": 0.22962,
    "c": 0.11486,
    "h": 273.3
  },
  "luminance": 0.01046
}

Semantic roles & 50–950 ramp

primary

#100F51

secondary

#8A8B31

accent

#EC3CE9

background

#F5F4F8

surface

#E9E7EF

border

#C5C3CA

text

#04010B

muted

#79777C

Preview Lab

Preview with #100F51

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

Preview Lab → · Contrast checker → · Palette generator →