#1B3587#1B3587

#1B3587 is a dark, vivid blue. Relative luminance 0.045; OKLCH L 36.5% C 0.141 H 266.0°. Best body text is #FFFFFF at 11.02:1 contrast (WCAG AA passes).

Color values

HEX	#1B3587
RGB	rgb(27, 53, 135)
HSL	hsl(226, 67%, 32%)
HSV	hsv(226, 80%, 53%)
CMYK	cmyk(80%, 60.7%, 0%, 47.1%)
CIE-LAB	lab(25.34, 21.94, -48.63)
CIE-LCH	lch(25.34, 53.35, 294.28°)
OKLab	oklab(36.46% -0.0098 -0.1405)
OKLCH	oklch(36.46% 0.141 266)
XYZ	xyz(6.0967, 4.5278, 23.4696)
Luminance	0.0453 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3587 #876D1B

analogous

#1B6B87 #1B3587 #371B87

triadic

#1B3587 #871B35 #35871B

tetradic

#1B3587 #871B6B #876D1B #1B8737

square

#1B3587 #871B6B #876D1B #1B8737

split-complementary

#1B3587 #87371B #6B871B

monochromatic

#070D21 #112154 #1B3587 #2549BA #4367D9

Accessibility & contrast

On white

11.02

#1B3587 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.91

#1B3587 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3587

11.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3587	#FFFFFF	#000000	##FFFFFF
##1B3587	1.00	11.02	1.91	11.02
#FFFFFF	11.02	1.00	21.00	1.00
#000000	1.91	21.00	1.00	21.00
##FFFFFF	11.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00418A

Deuteranopia (green-blind)

#003785

Tritanopia (blue-blind)

#004A58

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b3587;
/* rgb */ color: rgb(27, 53, 135);
/* oklch */ color: oklch(36.5% 0.141 266.0);

Tailwind

colors: {
  custom: {
    50: '#6a6bab',
    500: '#1b3587',
    950: '#000000',
  },
}

SCSS

$custom: #1b3587;
$custom-light: #6a6bab;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3587",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 135
  },
  "hsl": {
    "h": 225.556,
    "s": 66.667,
    "l": 31.765
  },
  "oklch": {
    "l": 0.36462,
    "c": 0.14085,
    "h": 266
  },
  "luminance": 0.04528
}

Semantic roles & 50–950 ramp

primary

#1B3587

secondary

#BA9E44

accent

#C03EEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080610

muted

#7A7A7F

Preview Lab

Preview with #1B3587

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

Preview Lab → · Contrast checker → · Palette generator →