#3740BC#3740BC

#3740BC is a dark, vivid blue. Relative luminance 0.081; OKLCH L 44.8% C 0.191 H 272.6°. Best body text is #FFFFFF at 8.01:1 contrast (WCAG AA passes).

Color values

HEX	#3740BC
RGB	rgb(55, 64, 188)
HSL	hsl(236, 55%, 48%)
HSV	hsv(236, 71%, 74%)
CMYK	cmyk(70.7%, 66%, 0%, 26.3%)
CIE-LAB	lab(34.21, 37.74, -66.15)
CIE-LCH	lch(34.21, 76.16, 299.71°)
OKLab	oklab(44.82% 0.0087 -0.1911)
OKLCH	oklch(44.82% 0.191 272.6)
XYZ	xyz(12.4830, 8.1086, 48.4745)
Luminance	0.0811 (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

#3740BC #BCB337

analogous

#3782BC #3740BC #7137BC

triadic

#3740BC #BC3740 #40BC37

tetradic

#3740BC #BC3782 #BCB337 #37BC71

square

#3740BC #BC3782 #BCB337 #37BC71

split-complementary

#3740BC #BC7137 #82BC37

monochromatic

#1B205D #29308D #3740BC #6067D0 #8F94DE

Accessibility & contrast

On white

8.01

#3740BC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.62

#3740BC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740BC

8.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740BC	#FFFFFF	#000000	##FFFFFF
##3740BC	1.00	8.01	2.62	8.01
#FFFFFF	8.01	1.00	21.00	1.00
#000000	2.62	21.00	1.00	21.00
##FFFFFF	8.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057C0

Deuteranopia (green-blind)

#004ABA

Tritanopia (blue-blind)

#006178

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3740bc;
/* rgb */ color: rgb(55, 64, 188);
/* oklch */ color: oklch(44.8% 0.191 272.6);

Tailwind

colors: {
  custom: {
    50: '#8075d1',
    500: '#3740bc',
    950: '#000000',
  },
}

SCSS

$custom: #3740bc;
$custom-light: #8075d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3740bc",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 188
  },
  "hsl": {
    "h": 235.94,
    "s": 54.733,
    "l": 47.647
  },
  "oklch": {
    "l": 0.44819,
    "c": 0.19133,
    "h": 272.6
  },
  "luminance": 0.0811
}

Semantic roles & 50–950 ramp

primary

#3740BC

secondary

#C9C486

accent

#D44ADE

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3740BC

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

Preview Lab → · Contrast checker → · Palette generator →