#1B3789#1B3789

#1B3789 is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.1% C 0.141 H 265.5°. Best body text is #FFFFFF at 10.74:1 contrast (WCAG AA passes).

Color values

HEX	#1B3789
RGB	rgb(27, 55, 137)
HSL	hsl(225, 67%, 32%)
HSV	hsv(225, 80%, 54%)
CMYK	cmyk(80.3%, 59.9%, 0%, 46.3%)
CIE-LAB	lab(26.07, 21.35, -48.69)
CIE-LCH	lch(26.07, 53.17, 293.67°)
OKLab	oklab(37.06% -0.0111 -0.1406)
OKLCH	oklch(37.06% 0.141 265.5)
XYZ	xyz(6.3319, 4.7708, 24.2492)
Luminance	0.0477 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3789 #896D1B

analogous

#1B6E89 #1B3789 #361B89

triadic

#1B3789 #891B37 #37891B

tetradic

#1B3789 #891B6E #896D1B #1B8936

square

#1B3789 #891B6E #896D1B #1B8936

split-complementary

#1B3789 #89361B #6E891B

monochromatic

#070E23 #112256 #1B3789 #254CBC #446ADA

Accessibility & contrast

On white

10.74

#1B3789 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#1B3789 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3789

10.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3789	#FFFFFF	#000000	##FFFFFF
##1B3789	1.00	10.74	1.95	10.74
#FFFFFF	10.74	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00438C

Deuteranopia (green-blind)

#003987

Tritanopia (blue-blind)

#004C5A

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3789;
/* rgb */ color: rgb(27, 55, 137);
/* oklch */ color: oklch(37.1% 0.141 265.5);

Tailwind

colors: {
  custom: {
    50: '#6a6dac',
    500: '#1b3789',
    950: '#000000',
  },
}

SCSS

$custom: #1b3789;
$custom-light: #6a6dac;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3789",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 137
  },
  "hsl": {
    "h": 224.727,
    "s": 67.073,
    "l": 32.157
  },
  "oklch": {
    "l": 0.37059,
    "c": 0.14109,
    "h": 265.5
  },
  "luminance": 0.04772
}

Semantic roles & 50–950 ramp

primary

#1B3789

secondary

#BC9D44

accent

#BE3EEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B3789

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

Preview Lab → · Contrast checker → · Palette generator →