#3740B2#3740B2

#3740B2 is a dark, vivid blue. Relative luminance 0.077; OKLCH L 43.9% C 0.178 H 273.0°. Best body text is #FFFFFF at 8.27:1 contrast (WCAG AA passes).

Color values

HEX	#3740B2
RGB	rgb(55, 64, 178)
HSL	hsl(236, 53%, 46%)
HSV	hsv(236, 69%, 70%)
CMYK	cmyk(69.1%, 64%, 0%, 30.2%)
CIE-LAB	lab(33.33, 34.24, -61.67)
CIE-LCH	lch(33.33, 70.54, 299.04°)
OKLab	oklab(43.91% 0.0094 -0.178)
OKLCH	oklch(43.91% 0.178 273)
XYZ	xyz(11.4421, 7.6923, 42.9926)
Luminance	0.0769 (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

#3740B2 #B2A937

analogous

#377DB2 #3740B2 #6B37B2

triadic

#3740B2 #B23740 #40B237

tetradic

#3740B2 #B2377D #B2A937 #37B26B

square

#3740B2 #B2377D #B2A937 #37B26B

split-complementary

#3740B2 #B26B37 #7DB237

monochromatic

#1A1E54 #292F83 #3740B2 #5A62CC #898FDB

Accessibility & contrast

On white

8.27

#3740B2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.54

#3740B2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740B2

8.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740B2	#FFFFFF	#000000	##FFFFFF
##3740B2	1.00	8.27	2.54	8.27
#FFFFFF	8.27	1.00	21.00	1.00
#000000	2.54	21.00	1.00	21.00
##FFFFFF	8.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0054B6

Deuteranopia (green-blind)

#0049B0

Tritanopia (blue-blind)

#005D73

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #3740b2;
/* rgb */ color: rgb(55, 64, 178);
/* oklch */ color: oklch(43.9% 0.178 273.0);

Tailwind

colors: {
  custom: {
    50: '#7e75ca',
    500: '#3740b2',
    950: '#000000',
  },
}

SCSS

$custom: #3740b2;
$custom-light: #7e75ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3740b2",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 178
  },
  "hsl": {
    "h": 235.61,
    "s": 52.79,
    "l": 45.686
  },
  "oklch": {
    "l": 0.43911,
    "c": 0.17826,
    "h": 273
  },
  "luminance": 0.07693
}

Semantic roles & 50–950 ramp

primary

#3740B2

secondary

#C5C080

accent

#D24CDC

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3740B2

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

Preview Lab → · Contrast checker → · Palette generator →