#3748BB#3748BB

#3748BB is a mid, vivid blue. Relative luminance 0.090; OKLCH L 46.1% C 0.181 H 271.0°. Best body text is #FFFFFF at 7.48:1 contrast (WCAG AA passes).

Color values

HEX	#3748BB
RGB	rgb(55, 72, 187)
HSL	hsl(232, 55%, 47%)
HSV	hsv(232, 71%, 73%)
CMYK	cmyk(70.6%, 61.5%, 0%, 26.7%)
CIE-LAB	lab(36.05, 32.34, -62.55)
CIE-LCH	lch(36.05, 70.41, 297.34°)
OKLab	oklab(46.14% 0.0031 -0.1805)
OKLCH	oklch(46.14% 0.181 271)
XYZ	xyz(12.8595, 9.0335, 48.0700)
Luminance	0.0903 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3748BB #BBAA37

analogous

#378ABB #3748BB #6837BB

triadic

#3748BB #BB3748 #48BB37

tetradic

#3748BB #BB378A #BBAA37 #37BB68

square

#3748BB #BB378A #BBAA37 #37BB68

split-complementary

#3748BB #BB6837 #8ABB37

monochromatic

#1B245C #29368C #3748BB #5F6ED0 #8E99DE

Accessibility & contrast

On white

7.48

#3748BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.81

#3748BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3748BB

7.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3748BB	#FFFFFF	#000000	##FFFFFF
##3748BB	1.00	7.48	2.81	7.48
#FFFFFF	7.48	1.00	21.00	1.00
#000000	2.81	21.00	1.00	21.00
##FFFFFF	7.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BBF

Deuteranopia (green-blind)

#004FB9

Tritanopia (blue-blind)

#00657A

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3748bb;
/* rgb */ color: rgb(55, 72, 187);
/* oklch */ color: oklch(46.1% 0.181 271.0);

Tailwind

colors: {
  custom: {
    50: '#7f7bd0',
    500: '#3748bb',
    950: '#000000',
  },
}

SCSS

$custom: #3748bb;
$custom-light: #7f7bd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3748bb",
  "rgb": {
    "r": 55,
    "g": 72,
    "b": 187
  },
  "hsl": {
    "h": 232.273,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.46143,
    "c": 0.18055,
    "h": 271
  },
  "luminance": 0.09035
}

Semantic roles & 50–950 ramp

primary

#3748BB

secondary

#C9C085

accent

#CB4ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0B0914

muted

#7C7B82

Preview Lab

Preview with #3748BB

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

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