#3740B3#3740B3

#3740B3 is a dark, vivid blue. Relative luminance 0.077; OKLCH L 44.0% C 0.180 H 273.0°. Best body text is #FFFFFF at 8.25:1 contrast (WCAG AA passes).

Color values

HEX	#3740B3
RGB	rgb(55, 64, 179)
HSL	hsl(236, 53%, 46%)
HSV	hsv(236, 69%, 70%)
CMYK	cmyk(69.3%, 64.2%, 0%, 29.8%)
CIE-LAB	lab(33.42, 34.59, -62.12)
CIE-LCH	lch(33.42, 71.10, 299.11°)
OKLab	oklab(44% 0.0094 -0.1793)
OKLCH	oklch(44% 0.18 273)
XYZ	xyz(11.5429, 7.7326, 43.5233)
Luminance	0.0773 (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

#3740B3 #B3AA37

analogous

#377EB3 #3740B3 #6C37B3

triadic

#3740B3 #B33740 #40B337

tetradic

#3740B3 #B3377E #B3AA37 #37B36C

square

#3740B3 #B3377E #B3AA37 #37B36C

split-complementary

#3740B3 #B36C37 #7EB337

monochromatic

#1A1F55 #292F84 #3740B3 #5B63CD #8A8FDB

Accessibility & contrast

On white

8.25

#3740B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.55

#3740B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740B3

8.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740B3	#FFFFFF	#000000	##FFFFFF
##3740B3	1.00	8.25	2.55	8.25
#FFFFFF	8.25	1.00	21.00	1.00
#000000	2.55	21.00	1.00	21.00
##FFFFFF	8.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0054B7

Deuteranopia (green-blind)

#0049B1

Tritanopia (blue-blind)

#005E73

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #3740b3;
/* rgb */ color: rgb(55, 64, 179);
/* oklch */ color: oklch(44.0% 0.180 273.0);

Tailwind

colors: {
  custom: {
    50: '#7e75cb',
    500: '#3740b3',
    950: '#000000',
  },
}

SCSS

$custom: #3740b3;
$custom-light: #7e75cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3740b3",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 179
  },
  "hsl": {
    "h": 235.645,
    "s": 52.991,
    "l": 45.882
  },
  "oklch": {
    "l": 0.44,
    "c": 0.17957,
    "h": 273
  },
  "luminance": 0.07734
}

Semantic roles & 50–950 ramp

primary

#3740B3

secondary

#C5C081

accent

#D24BDC

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3740B3

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

Preview Lab → · Contrast checker → · Palette generator →