#1B105E#1B105E

#1B105E is a dark, vivid blue. Relative luminance 0.014; OKLCH L 25.5% C 0.129 H 278.5°. Best body text is #FFFFFF at 16.38:1 contrast (WCAG AA passes).

Color values

HEX	#1B105E
RGB	rgb(27, 16, 94)
HSL	hsl(248, 71%, 22%)
HSV	hsv(248, 83%, 37%)
CMYK	cmyk(71.3%, 83%, 0%, 63.1%)
CIE-LAB	lab(12.03, 30.91, -44.02)
CIE-LCH	lch(12.03, 53.79, 305.08°)
OKLab	oklab(25.53% 0.0191 -0.1271)
OKLCH	oklch(25.53% 0.129 278.5)
XYZ	xyz(2.6570, 1.4115, 10.7199)
Luminance	0.0141 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B105E #535E10

analogous

#102C5E #1B105E #42105E

triadic

#1B105E #5E1B10 #105E1B

tetradic

#1B105E #5E102C #535E10 #105E42

square

#1B105E #5E102C #535E10 #105E42

split-complementary

#1B105E #5E4210 #2C5E10

monochromatic

#08041A #0C072A #1B105E #2A1992 #3922C7

Accessibility & contrast

On white

16.38

#1B105E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.28

#1B105E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B105E

16.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B105E	#FFFFFF	#000000	##FFFFFF
##1B105E	1.00	16.38	1.28	16.38
#FFFFFF	16.38	1.00	21.00	1.00
#000000	1.28	21.00	1.00	21.00
##FFFFFF	16.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002360

Deuteranopia (green-blind)

#001C5D

Tritanopia (blue-blind)

#002737

Achromatopsia (no color)

#202020

Design tokens & code

CSS

--color: #1b105e;
/* rgb */ color: rgb(27, 16, 94);
/* oklch */ color: oklch(25.5% 0.129 278.5);

Tailwind

colors: {
  custom: {
    50: '#63508d',
    500: '#1b105e',
    950: '#000000',
  },
}

SCSS

$custom: #1b105e;
$custom-light: #63508d;
$custom-dark: #000000;

JSON

{
  "hex": "#1b105e",
  "rgb": {
    "r": 27,
    "g": 16,
    "b": 94
  },
  "hsl": {
    "h": 248.462,
    "s": 70.909,
    "l": 21.569
  },
  "oklch": {
    "l": 0.25534,
    "c": 0.12855,
    "h": 278.5
  },
  "luminance": 0.01412
}

Semantic roles & 50–950 ramp

primary

#1B105E

secondary

#899733

accent

#EE3AD4

background

#F6F4F8

surface

#EBE7F0

border

#C6C3CB

text

#06020C

muted

#7A787D

Preview Lab

Preview with #1B105E

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

Preview Lab → · Contrast checker → · Palette generator →