#3740B8#3740B8

#3740B8 is a dark, vivid blue. Relative luminance 0.079; OKLCH L 44.5% C 0.186 H 272.8°. Best body text is #FFFFFF at 8.11:1 contrast (WCAG AA passes).

Color values

HEX	#3740B8
RGB	rgb(55, 64, 184)
HSL	hsl(236, 54%, 47%)
HSV	hsv(236, 70%, 72%)
CMYK	cmyk(70.1%, 65.2%, 0%, 27.8%)
CIE-LAB	lab(33.85, 36.34, -64.37)
CIE-LCH	lch(33.85, 73.92, 299.45°)
OKLab	oklab(44.45% 0.009 -0.1859)
OKLCH	oklch(44.45% 0.186 272.8)
XYZ	xyz(12.0578, 7.9385, 46.2349)
Luminance	0.0794 (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

#3740B8 #B8AF37

analogous

#3781B8 #3740B8 #6F37B8

triadic

#3740B8 #B83740 #40B837

tetradic

#3740B8 #B83781 #B8AF37 #37B86F

square

#3740B8 #B83781 #B8AF37 #37B86F

split-complementary

#3740B8 #B86F37 #81B837

monochromatic

#1B1F5A #293089 #3740B8 #5D65CF #8D92DD

Accessibility & contrast

On white

8.11

#3740B8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.59

#3740B8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740B8

8.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740B8	#FFFFFF	#000000	##FFFFFF
##3740B8	1.00	8.11	2.59	8.11
#FFFFFF	8.11	1.00	21.00	1.00
#000000	2.59	21.00	1.00	21.00
##FFFFFF	8.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056BC

Deuteranopia (green-blind)

#004AB6

Tritanopia (blue-blind)

#005F76

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3740b8;
/* rgb */ color: rgb(55, 64, 184);
/* oklch */ color: oklch(44.5% 0.186 272.8);

Tailwind

colors: {
  custom: {
    50: '#7f75ce',
    500: '#3740b8',
    950: '#000000',
  },
}

SCSS

$custom: #3740b8;
$custom-light: #7f75ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3740b8",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 184
  },
  "hsl": {
    "h": 235.814,
    "s": 53.975,
    "l": 46.863
  },
  "oklch": {
    "l": 0.44452,
    "c": 0.18614,
    "h": 272.8
  },
  "luminance": 0.0794
}

Semantic roles & 50–950 ramp

primary

#3740B8

secondary

#C7C384

accent

#D34ADD

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0B0814

muted

#7C7B82

Preview Lab

Preview with #3740B8

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

Preview Lab → · Contrast checker → · Palette generator →