#3740B7#3740B7

#3740B7 is a dark, vivid blue. Relative luminance 0.079; OKLCH L 44.4% C 0.185 H 272.8°. Best body text is #FFFFFF at 8.14:1 contrast (WCAG AA passes).

Color values

HEX	#3740B7
RGB	rgb(55, 64, 183)
HSL	hsl(236, 54%, 47%)
HSV	hsv(236, 70%, 72%)
CMYK	cmyk(69.9%, 65%, 0%, 28.2%)
CIE-LAB	lab(33.77, 35.99, -63.92)
CIE-LCH	lch(33.77, 73.36, 299.38°)
OKLab	oklab(44.36% 0.0091 -0.1846)
OKLCH	oklch(44.36% 0.185 272.8)
XYZ	xyz(11.9533, 7.8968, 45.6848)
Luminance	0.0790 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3740B7 #B7AE37

analogous

#3780B7 #3740B7 #6E37B7

triadic

#3740B7 #B73740 #40B737

tetradic

#3740B7 #B73780 #B7AE37 #37B76E

square

#3740B7 #B73780 #B7AE37 #37B76E

split-complementary

#3740B7 #B76E37 #80B737

monochromatic

#1B1F59 #293088 #3740B7 #5D65CE #8C92DC

Accessibility & contrast

On white

8.14

#3740B7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.58

#3740B7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740B7

8.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740B7	#FFFFFF	#000000	##FFFFFF
##3740B7	1.00	8.14	2.58	8.14
#FFFFFF	8.14	1.00	21.00	1.00
#000000	2.58	21.00	1.00	21.00
##FFFFFF	8.14	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055BB

Deuteranopia (green-blind)

#004AB5

Tritanopia (blue-blind)

#005F76

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #3740b7;
/* rgb */ color: rgb(55, 64, 183);
/* oklch */ color: oklch(44.4% 0.185 272.8);

Tailwind

colors: {
  custom: {
    50: '#7f75ce',
    500: '#3740b7',
    950: '#000000',
  },
}

SCSS

$custom: #3740b7;
$custom-light: #7f75ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3740b7",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 183
  },
  "hsl": {
    "h": 235.781,
    "s": 53.782,
    "l": 46.667
  },
  "oklch": {
    "l": 0.44361,
    "c": 0.18483,
    "h": 272.8
  },
  "luminance": 0.07898
}

Semantic roles & 50–950 ramp

primary

#3740B7

secondary

#C7C283

accent

#D34BDD

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0B0814

muted

#7C7B82

Preview Lab

Preview with #3740B7

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

Preview Lab → · Contrast checker → · Palette generator →