#3739BA#3739BA

#3739BA is a dark, vivid blue. Relative luminance 0.073; OKLCH L 43.5% C 0.197 H 273.9°. Best body text is #FFFFFF at 8.55:1 contrast (WCAG AA passes).

Color values

HEX	#3739BA
RGB	rgb(55, 57, 186)
HSL	hsl(239, 54%, 47%)
HSV	hsv(239, 70%, 73%)
CMYK	cmyk(70.4%, 69.4%, 0%, 27.1%)
CIE-LAB	lab(32.44, 41.33, -67.87)
CIE-LCH	lch(32.44, 79.46, 301.34°)
OKLab	oklab(43.48% 0.0134 -0.1962)
OKLCH	oklch(43.48% 0.197 273.9)
XYZ	xyz(11.8987, 7.2825, 47.2235)
Luminance	0.0728 (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

#3739BA #BAB837

analogous

#377BBA #3739BA #7737BA

triadic

#3739BA #BA3739 #39BA37

tetradic

#3739BA #BA377B #BAB837 #37BA77

square

#3739BA #BA377B #BAB837 #37BA77

split-complementary

#3739BA #BA7737 #7BBA37

monochromatic

#1B1C5C #292B8B #3739BA #5F60D0 #8E8FDE

Accessibility & contrast

On white

8.55

#3739BA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.46

#3739BA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739BA

8.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739BA	#FFFFFF	#000000	##FFFFFF
##3739BA	1.00	8.55	2.46	8.55
#FFFFFF	8.55	1.00	21.00	1.00
#000000	2.46	21.00	1.00	21.00
##FFFFFF	8.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BE

Deuteranopia (green-blind)

#0046B8

Tritanopia (blue-blind)

#005C75

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3739ba;
/* rgb */ color: rgb(55, 57, 186);
/* oklch */ color: oklch(43.5% 0.197 273.9);

Tailwind

colors: {
  custom: {
    50: '#8070d0',
    500: '#3739ba',
    950: '#000000',
  },
}

SCSS

$custom: #3739ba;
$custom-light: #8070d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3739ba",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 186
  },
  "hsl": {
    "h": 239.084,
    "s": 54.357,
    "l": 47.255
  },
  "oklch": {
    "l": 0.43483,
    "c": 0.19664,
    "h": 273.9
  },
  "luminance": 0.07284
}

Semantic roles & 50–950 ramp

primary

#3739BA

secondary

#C8C785

accent

#DB4ADE

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3739BA

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

Preview Lab → · Contrast checker → · Palette generator →