#100F5A#100F5A

#100F5A is a very dark, vivid blue. Relative luminance 0.012; OKLCH L 24.1% C 0.127 H 272.0°. Best body text is #FFFFFF at 16.96:1 contrast (WCAG AA passes).

Color values

HEX	#100F5A
RGB	rgb(16, 15, 90)
HSL	hsl(241, 71%, 21%)
HSV	hsv(241, 83%, 35%)
CMYK	cmyk(82.2%, 83.3%, 0%, 64.7%)
CIE-LAB	lab(10.48, 28.98, -43.92)
CIE-LCH	lch(10.48, 52.62, 303.42°)
OKLab	oklab(24.08% 0.0045 -0.1271)
OKLCH	oklch(24.08% 0.127 272)
XYZ	xyz(2.2294, 1.1898, 9.7830)
Luminance	0.0119 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#100F5A #595A0F

analogous

#0F335A #100F5A #350F5A

triadic

#100F5A #5A100F #0F5A10

tetradic

#100F5A #5A0F33 #595A0F #0F5A35

square

#100F5A #5A0F33 #595A0F #0F5A35

split-complementary

#100F5A #5A350F #335A0F

monochromatic

#05041A #070626 #100F5A #19188E #2320C3

Accessibility & contrast

On white

16.96

#100F5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.24

#100F5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #100F5A

16.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##100F5A	#FFFFFF	#000000	##FFFFFF
##100F5A	1.00	16.96	1.24	16.96
#FFFFFF	16.96	1.00	21.00	1.00
#000000	1.24	21.00	1.00	21.00
##FFFFFF	16.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00205C

Deuteranopia (green-blind)

#001959

Tritanopia (blue-blind)

#002634

Achromatopsia (no color)

#1C1C1C

Design tokens & code

CSS

--color: #100f5a;
/* rgb */ color: rgb(16, 15, 90);
/* oklch */ color: oklch(24.1% 0.127 272.0);

Tailwind

colors: {
  custom: {
    50: '#5e4f8a',
    500: '#100f5a',
    950: '#000000',
  },
}

SCSS

$custom: #100f5a;
$custom-light: #5e4f8a;
$custom-dark: #000000;

JSON

{
  "hex": "#100f5a",
  "rgb": {
    "r": 16,
    "g": 15,
    "b": 90
  },
  "hsl": {
    "h": 240.8,
    "s": 71.429,
    "l": 20.588
  },
  "oklch": {
    "l": 0.24078,
    "c": 0.12721,
    "h": 272
  },
  "luminance": 0.0119
}

Semantic roles & 50–950 ramp

primary

#100F5A

secondary

#929431

accent

#EE3AEC

background

#F5F4F8

surface

#EAE7F0

border

#C6C3CB

text

#05020C

muted

#79787D

Preview Lab

Preview with #100F5A

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

Preview Lab → · Contrast checker → · Palette generator →