#1B105A#1B105A

#1B105A is a dark, vivid blue. Relative luminance 0.013; OKLCH L 25.1% C 0.123 H 279.5°. Best body text is #FFFFFF at 16.56:1 contrast (WCAG AA passes).

Color values

HEX	#1B105A
RGB	rgb(27, 16, 90)
HSL	hsl(249, 70%, 21%)
HSV	hsv(249, 82%, 35%)
CMYK	cmyk(70%, 82.2%, 0%, 64.7%)
CIE-LAB	lab(11.56, 29.54, -42.10)
CIE-LCH	lch(11.56, 51.43, 305.05°)
OKLab	oklab(25.06% 0.0202 -0.1216)
OKLCH	oklch(25.06% 0.123 279.5)
XYZ	xyz(2.4822, 1.3416, 9.7990)
Luminance	0.0134 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B105A #4F5A10

analogous

#102A5A #1B105A #40105A

triadic

#1B105A #5A1B10 #105A1B

tetradic

#1B105A #5A102A #4F5A10 #105A40

square

#1B105A #5A102A #4F5A10 #105A40

split-complementary

#1B105A #5A4010 #2A5A10

monochromatic

#08051A #0B0726 #1B105A #2B198E #3A22C2

Accessibility & contrast

On white

16.56

#1B105A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.27

#1B105A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B105A

16.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B105A	#FFFFFF	#000000	##FFFFFF
##1B105A	1.00	16.56	1.27	16.56
#FFFFFF	16.56	1.00	21.00	1.00
#000000	1.27	21.00	1.00	21.00
##FFFFFF	16.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00215C

Deuteranopia (green-blind)

#001C59

Tritanopia (blue-blind)

#002634

Achromatopsia (no color)

#1F1F1F

Design tokens & code

CSS

--color: #1b105a;
/* rgb */ color: rgb(27, 16, 90);
/* oklch */ color: oklch(25.1% 0.123 279.5);

Tailwind

colors: {
  custom: {
    50: '#62508a',
    500: '#1b105a',
    950: '#000000',
  },
}

SCSS

$custom: #1b105a;
$custom-light: #62508a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b105a",
  "rgb": {
    "r": 27,
    "g": 16,
    "b": 90
  },
  "hsl": {
    "h": 248.919,
    "s": 69.811,
    "l": 20.784
  },
  "oklch": {
    "l": 0.25064,
    "c": 0.12323,
    "h": 279.5
  },
  "luminance": 0.01342
}

Semantic roles & 50–950 ramp

primary

#1B105A

secondary

#859333

accent

#ED3BD2

background

#F6F4F8

surface

#EBE7F0

border

#C6C3CB

text

#06020C

muted

#7A787D

Preview Lab

Preview with #1B105A

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

Preview Lab → · Contrast checker → · Palette generator →