#3749BB#3749BB

#3749BB is a mid, vivid blue. Relative luminance 0.092; OKLCH L 46.3% C 0.179 H 270.8°. Best body text is #FFFFFF at 7.41:1 contrast (WCAG AA passes).

Color values

HEX	#3749BB
RGB	rgb(55, 73, 187)
HSL	hsl(232, 55%, 47%)
HSV	hsv(232, 71%, 73%)
CMYK	cmyk(70.6%, 61%, 0%, 26.7%)
CIE-LAB	lab(36.30, 31.69, -62.14)
CIE-LCH	lch(36.30, 69.76, 297.02°)
OKLab	oklab(46.33% 0.0024 -0.1793)
OKLCH	oklch(46.33% 0.179 270.8)
XYZ	xyz(12.9247, 9.1639, 48.0917)
Luminance	0.0916 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3749BB #BBA937

analogous

#378BBB #3749BB #6737BB

triadic

#3749BB #BB3749 #49BB37

tetradic

#3749BB #BB378B #BBA937 #37BB67

square

#3749BB #BB378B #BBA937 #37BB67

split-complementary

#3749BB #BB6737 #8BBB37

monochromatic

#1B245C #29378C #3749BB #5F6FD0 #8E99DE

Accessibility & contrast

On white

7.41

#3749BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.83

#3749BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3749BB

7.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3749BB	#FFFFFF	#000000	##FFFFFF
##3749BB	1.00	7.41	2.83	7.41
#FFFFFF	7.41	1.00	21.00	1.00
#000000	2.83	21.00	1.00	21.00
##FFFFFF	7.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CBF

Deuteranopia (green-blind)

#004FB9

Tritanopia (blue-blind)

#00667B

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3749bb;
/* rgb */ color: rgb(55, 73, 187);
/* oklch */ color: oklch(46.3% 0.179 270.8);

Tailwind

colors: {
  custom: {
    50: '#7f7bd0',
    500: '#3749bb',
    950: '#000000',
  },
}

SCSS

$custom: #3749bb;
$custom-light: #7f7bd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3749bb",
  "rgb": {
    "r": 55,
    "g": 73,
    "b": 187
  },
  "hsl": {
    "h": 231.818,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.46328,
    "c": 0.17934,
    "h": 270.8
  },
  "luminance": 0.09165
}

Semantic roles & 50–950 ramp

primary

#3749BB

secondary

#C9BF85

accent

#CA4ADE

background

#F8F7FC

surface

#F0EEF9

border

#CBC9D2

text

#0B0914

muted

#7C7B82

Preview Lab

Preview with #3749BB

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

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