#100F5B#100F5B

#100F5B is a very dark, vivid blue. Relative luminance 0.012; OKLCH L 24.2% C 0.129 H 271.9°. Best body text is #FFFFFF at 16.92:1 contrast (WCAG AA passes).

Color values

HEX	#100F5B
RGB	rgb(16, 15, 91)
HSL	hsl(241, 72%, 21%)
HSV	hsv(241, 84%, 36%)
CMYK	cmyk(82.4%, 83.5%, 0%, 64.3%)
CIE-LAB	lab(10.61, 29.35, -44.39)
CIE-LCH	lch(10.61, 53.21, 303.47°)
OKLab	oklab(24.2% 0.0043 -0.1285)
OKLCH	oklch(24.2% 0.129 271.9)
XYZ	xyz(2.2722, 1.2069, 10.0087)
Luminance	0.0121 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#100F5B #5A5B0F

analogous

#0F345B #100F5B #360F5B

triadic

#100F5B #5B100F #0F5B10

tetradic

#100F5B #5B0F34 #5A5B0F #0F5B36

square

#100F5B #5B0F34 #5A5B0F #0F5B36

split-complementary

#100F5B #5B360F #345B0F

monochromatic

#05041A #070626 #100F5B #191890 #2220C4

Accessibility & contrast

On white

16.92

#100F5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.24

#100F5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #100F5B

16.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##100F5B	#FFFFFF	#000000	##FFFFFF
##100F5B	1.00	16.92	1.24	16.92
#FFFFFF	16.92	1.00	21.00	1.00
#000000	1.24	21.00	1.00	21.00
##FFFFFF	16.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00205D

Deuteranopia (green-blind)

#00195A

Tritanopia (blue-blind)

#002635

Achromatopsia (no color)

#1D1D1D

Design tokens & code

CSS

--color: #100f5b;
/* rgb */ color: rgb(16, 15, 91);
/* oklch */ color: oklch(24.2% 0.129 271.9);

Tailwind

colors: {
  custom: {
    50: '#5e4f8a',
    500: '#100f5b',
    950: '#000000',
  },
}

SCSS

$custom: #100f5b;
$custom-light: #5e4f8a;
$custom-dark: #000000;

JSON

{
  "hex": "#100f5b",
  "rgb": {
    "r": 16,
    "g": 15,
    "b": 91
  },
  "hsl": {
    "h": 240.789,
    "s": 71.698,
    "l": 20.784
  },
  "oklch": {
    "l": 0.24204,
    "c": 0.12855,
    "h": 271.9
  },
  "luminance": 0.01207
}

Semantic roles & 50–950 ramp

primary

#100F5B

secondary

#939531

accent

#EE39EC

background

#F5F4F8

surface

#EAE7F0

border

#C6C3CB

text

#05020C

muted

#79787D

Preview Lab

Preview with #100F5B

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

Preview Lab → · Contrast checker → · Palette generator →