#1B3582#1B3582

#1B3582 is a dark, vivid blue. Relative luminance 0.044; OKLCH L 36.0% C 0.134 H 265.7°. Best body text is #FFFFFF at 11.18:1 contrast (WCAG AA passes).

Color values

HEX	#1B3582
RGB	rgb(27, 53, 130)
HSL	hsl(225, 66%, 31%)
HSV	hsv(225, 79%, 51%)
CMYK	cmyk(79.2%, 59.2%, 0%, 49%)
CIE-LAB	lab(24.92, 19.93, -46.19)
CIE-LCH	lch(24.92, 50.31, 293.33°)
OKLab	oklab(36.01% -0.01 -0.1333)
OKLCH	oklch(36.01% 0.134 265.7)
XYZ	xyz(5.7529, 4.3903, 21.6590)
Luminance	0.0439 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3582 #82681B

analogous

#1B6882 #1B3582 #341B82

triadic

#1B3582 #821B35 #35821B

tetradic

#1B3582 #821B68 #82681B #1B8234

square

#1B3582 #821B68 #82681B #1B8234

split-complementary

#1B3582 #82341B #68821B

monochromatic

#060C1D #10204F #1B3582 #264AB5 #4066D7

Accessibility & contrast

On white

11.18

#1B3582 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#1B3582 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3582

11.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3582	#FFFFFF	#000000	##FFFFFF
##1B3582	1.00	11.18	1.88	11.18
#FFFFFF	11.18	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004085

Deuteranopia (green-blind)

#003780

Tritanopia (blue-blind)

#004856

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1b3582;
/* rgb */ color: rgb(27, 53, 130);
/* oklch */ color: oklch(36.0% 0.134 265.7);

Tailwind

colors: {
  custom: {
    50: '#696ba7',
    500: '#1b3582',
    950: '#000000',
  },
}

SCSS

$custom: #1b3582;
$custom-light: #696ba7;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3582",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 130
  },
  "hsl": {
    "h": 224.854,
    "s": 65.605,
    "l": 30.784
  },
  "oklch": {
    "l": 0.36013,
    "c": 0.13372,
    "h": 265.7
  },
  "luminance": 0.04391
}

Semantic roles & 50–950 ramp

primary

#1B3582

secondary

#B69943

accent

#BE3FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B3582

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

Preview Lab → · Contrast checker → · Palette generator →