#1B105B#1B105B

#1B105B is a dark, vivid blue. Relative luminance 0.014; OKLCH L 25.2% C 0.125 H 279.2°. Best body text is #FFFFFF at 16.51:1 contrast (WCAG AA passes).

Color values

HEX	#1B105B
RGB	rgb(27, 16, 91)
HSL	hsl(249, 70%, 21%)
HSV	hsv(249, 82%, 36%)
CMYK	cmyk(70.3%, 82.4%, 0%, 64.3%)
CIE-LAB	lab(11.68, 29.88, -42.59)
CIE-LCH	lch(11.68, 52.02, 305.06°)
OKLab	oklab(25.18% 0.02 -0.123)
OKLCH	oklch(25.18% 0.125 279.2)
XYZ	xyz(2.5250, 1.3587, 10.0247)
Luminance	0.0136 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B105B #505B10

analogous

#102A5B #1B105B #40105B

triadic

#1B105B #5B1B10 #105B1B

tetradic

#1B105B #5B102A #505B10 #105B40

square

#1B105B #5B102A #505B10 #105B40

split-complementary

#1B105B #5B4010 #2A5B10

monochromatic

#08051A #0C0727 #1B105B #2A198F #3A22C3

Accessibility & contrast

On white

16.51

#1B105B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.27

#1B105B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B105B

16.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B105B	#FFFFFF	#000000	##FFFFFF
##1B105B	1.00	16.51	1.27	16.51
#FFFFFF	16.51	1.00	21.00	1.00
#000000	1.27	21.00	1.00	21.00
##FFFFFF	16.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00225D

Deuteranopia (green-blind)

#001C5A

Tritanopia (blue-blind)

#002635

Achromatopsia (no color)

#1F1F1F

Design tokens & code

CSS

--color: #1b105b;
/* rgb */ color: rgb(27, 16, 91);
/* oklch */ color: oklch(25.2% 0.125 279.2);

Tailwind

colors: {
  custom: {
    50: '#62508a',
    500: '#1b105b',
    950: '#000000',
  },
}

SCSS

$custom: #1b105b;
$custom-light: #62508a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b105b",
  "rgb": {
    "r": 27,
    "g": 16,
    "b": 91
  },
  "hsl": {
    "h": 248.8,
    "s": 70.093,
    "l": 20.98
  },
  "oklch": {
    "l": 0.25181,
    "c": 0.12457,
    "h": 279.2
  },
  "luminance": 0.01359
}

Semantic roles & 50–950 ramp

primary

#1B105B

secondary

#869433

accent

#ED3BD3

background

#F6F4F8

surface

#EBE7F0

border

#C6C3CB

text

#06020C

muted

#7A787D

Preview Lab

Preview with #1B105B

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

Preview Lab → · Contrast checker → · Palette generator →