#3739B9#3739B9

#3739B9 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 43.4% C 0.195 H 274.0°. Best body text is #FFFFFF at 8.58:1 contrast (WCAG AA passes).

Color values

HEX	#3739B9
RGB	rgb(55, 57, 185)
HSL	hsl(239, 54%, 47%)
HSV	hsv(239, 70%, 73%)
CMYK	cmyk(70.3%, 69.2%, 0%, 27.5%)
CIE-LAB	lab(32.35, 40.99, -67.43)
CIE-LCH	lch(32.35, 78.91, 301.29°)
OKLab	oklab(43.39% 0.0135 -0.1949)
OKLCH	oklch(43.39% 0.195 274)
XYZ	xyz(11.7927, 7.2401, 46.6655)
Luminance	0.0724 (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

#3739B9 #B9B737

analogous

#377AB9 #3739B9 #7637B9

triadic

#3739B9 #B93739 #39B937

tetradic

#3739B9 #B9377A #B9B737 #37B976

square

#3739B9 #B9377A #B9B737 #37B976

split-complementary

#3739B9 #B97637 #7AB937

monochromatic

#1B1C5B #292A8A #3739B9 #5E60CF #8D8EDD

Accessibility & contrast

On white

8.58

#3739B9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.45

#3739B9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739B9

8.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739B9	#FFFFFF	#000000	##FFFFFF
##3739B9	1.00	8.58	2.45	8.58
#FFFFFF	8.58	1.00	21.00	1.00
#000000	2.45	21.00	1.00	21.00
##FFFFFF	8.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BD

Deuteranopia (green-blind)

#0046B7

Tritanopia (blue-blind)

#005C74

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3739b9;
/* rgb */ color: rgb(55, 57, 185);
/* oklch */ color: oklch(43.4% 0.195 274.0);

Tailwind

colors: {
  custom: {
    50: '#8070cf',
    500: '#3739b9',
    950: '#000000',
  },
}

SCSS

$custom: #3739b9;
$custom-light: #8070cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3739b9",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 185
  },
  "hsl": {
    "h": 239.077,
    "s": 54.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.43386,
    "c": 0.19538,
    "h": 274
  },
  "luminance": 0.07241
}

Semantic roles & 50–950 ramp

primary

#3739B9

secondary

#C8C784

accent

#DB4ADE

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3739B9

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

Preview Lab → · Contrast checker → · Palette generator →