#3747BB#3747BB

#3747BB is a mid, vivid blue. Relative luminance 0.089; OKLCH L 46.0% C 0.182 H 271.2°. Best body text is #FFFFFF at 7.55:1 contrast (WCAG AA passes).

Color values

HEX	#3747BB
RGB	rgb(55, 71, 187)
HSL	hsl(233, 55%, 47%)
HSV	hsv(233, 71%, 73%)
CMYK	cmyk(70.6%, 62%, 0%, 26.7%)
CIE-LAB	lab(35.80, 32.98, -62.95)
CIE-LCH	lch(35.80, 71.07, 297.65°)
OKLab	oklab(45.96% 0.0039 -0.1817)
OKLCH	oklch(45.96% 0.182 271.2)
XYZ	xyz(12.7954, 8.9053, 48.0486)
Luminance	0.0891 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 5.64

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3747BB #BBAB37

analogous

#3789BB #3747BB #6937BB

triadic

#3747BB #BB3747 #47BB37

tetradic

#3747BB #BB3789 #BBAB37 #37BB69

square

#3747BB #BB3789 #BBAB37 #37BB69

split-complementary

#3747BB #BB6937 #89BB37

monochromatic

#1B235C #29358C #3747BB #5F6DD0 #8E98DE

Accessibility & contrast

On white

7.55

#3747BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#3747BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3747BB

7.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3747BB	#FFFFFF	#000000	##FFFFFF
##3747BB	1.00	7.55	2.78	7.55
#FFFFFF	7.55	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005ABF

Deuteranopia (green-blind)

#004EB9

Tritanopia (blue-blind)

#00657A

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3747bb;
/* rgb */ color: rgb(55, 71, 187);
/* oklch */ color: oklch(46.0% 0.182 271.2);

Tailwind

colors: {
  custom: {
    50: '#7f7ad0',
    500: '#3747bb',
    950: '#000000',
  },
}

SCSS

$custom: #3747bb;
$custom-light: #7f7ad0;
$custom-dark: #000000;

JSON

{
  "hex": "#3747bb",
  "rgb": {
    "r": 55,
    "g": 71,
    "b": 187
  },
  "hsl": {
    "h": 232.727,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.45961,
    "c": 0.18176,
    "h": 271.2
  },
  "luminance": 0.08907
}

Semantic roles & 50–950 ramp

primary

#3747BB

secondary

#C9C085

accent

#CC4ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0B0914

muted

#7C7B82

Preview Lab

Preview with #3747BB

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

Preview Lab → · Contrast checker → · Palette generator →