#3739B7#3739B7

#3739B7 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 43.2% C 0.193 H 274.1°. Best body text is #FFFFFF at 8.64:1 contrast (WCAG AA passes).

Color values

HEX	#3739B7
RGB	rgb(55, 57, 183)
HSL	hsl(239, 54%, 47%)
HSV	hsv(239, 70%, 72%)
CMYK	cmyk(69.9%, 68.9%, 0%, 28.2%)
CIE-LAB	lab(32.16, 40.31, -66.56)
CIE-LCH	lch(32.16, 77.81, 301.20°)
OKLab	oklab(43.19% 0.0138 -0.1923)
OKLCH	oklch(43.19% 0.193 274.1)
XYZ	xyz(11.5831, 7.1563, 45.5614)
Luminance	0.0716 (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

#3739B7 #B7B537

analogous

#3779B7 #3739B7 #7537B7

triadic

#3739B7 #B73739 #39B737

tetradic

#3739B7 #B73779 #B7B537 #37B775

square

#3739B7 #B73779 #B7B537 #37B775

split-complementary

#3739B7 #B77537 #79B737

monochromatic

#1B1C59 #292A88 #3739B7 #5D5FCE #8C8DDC

Accessibility & contrast

On white

8.64

#3739B7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.43

#3739B7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739B7

8.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739B7	#FFFFFF	#000000	##FFFFFF
##3739B7	1.00	8.64	2.43	8.64
#FFFFFF	8.64	1.00	21.00	1.00
#000000	2.43	21.00	1.00	21.00
##FFFFFF	8.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BB

Deuteranopia (green-blind)

#0046B5

Tritanopia (blue-blind)

#005B73

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3739b7;
/* rgb */ color: rgb(55, 57, 183);
/* oklch */ color: oklch(43.2% 0.193 274.1);

Tailwind

colors: {
  custom: {
    50: '#8070ce',
    500: '#3739b7',
    950: '#000000',
  },
}

SCSS

$custom: #3739b7;
$custom-light: #8070ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3739b7",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 183
  },
  "hsl": {
    "h": 239.063,
    "s": 53.782,
    "l": 46.667
  },
  "oklch": {
    "l": 0.43194,
    "c": 0.19284,
    "h": 274.1
  },
  "luminance": 0.07157
}

Semantic roles & 50–950 ramp

primary

#3739B7

secondary

#C7C683

accent

#DB4BDD

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3739B7

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

Preview Lab → · Contrast checker → · Palette generator →