#3740B4#3740B4

#3740B4 is a dark, vivid blue. Relative luminance 0.078; OKLCH L 44.1% C 0.181 H 272.9°. Best body text is #FFFFFF at 8.22:1 contrast (WCAG AA passes).

Color values

HEX	#3740B4
RGB	rgb(55, 64, 180)
HSL	hsl(236, 53%, 46%)
HSV	hsv(236, 69%, 71%)
CMYK	cmyk(69.4%, 64.4%, 0%, 29.4%)
CIE-LAB	lab(33.51, 34.94, -62.57)
CIE-LCH	lch(33.51, 71.67, 299.18°)
OKLab	oklab(44.09% 0.0093 -0.1807)
OKLCH	oklch(44.09% 0.181 272.9)
XYZ	xyz(11.6444, 7.7732, 44.0579)
Luminance	0.0777 (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

#3740B4 #B4AB37

analogous

#377EB4 #3740B4 #6C37B4

triadic

#3740B4 #B43740 #40B437

tetradic

#3740B4 #B4377E #B4AB37 #37B46C

square

#3740B4 #B4377E #B4AB37 #37B46C

split-complementary

#3740B4 #B46C37 #7EB437

monochromatic

#1A1F56 #292F85 #3740B4 #5B63CD #8A90DB

Accessibility & contrast

On white

8.22

#3740B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.55

#3740B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740B4

8.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740B4	#FFFFFF	#000000	##FFFFFF
##3740B4	1.00	8.22	2.55	8.22
#FFFFFF	8.22	1.00	21.00	1.00
#000000	2.55	21.00	1.00	21.00
##FFFFFF	8.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055B8

Deuteranopia (green-blind)

#0049B2

Tritanopia (blue-blind)

#005E74

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #3740b4;
/* rgb */ color: rgb(55, 64, 180);
/* oklch */ color: oklch(44.1% 0.181 272.9);

Tailwind

colors: {
  custom: {
    50: '#7e75cb',
    500: '#3740b4',
    950: '#000000',
  },
}

SCSS

$custom: #3740b4;
$custom-light: #7e75cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3740b4",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 180
  },
  "hsl": {
    "h": 235.68,
    "s": 53.191,
    "l": 46.078
  },
  "oklch": {
    "l": 0.4409,
    "c": 0.1809,
    "h": 272.9
  },
  "luminance": 0.07774
}

Semantic roles & 50–950 ramp

primary

#3740B4

secondary

#C6C181

accent

#D24BDD

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3740B4

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

Preview Lab → · Contrast checker → · Palette generator →