#3739B8#3739B8

#3739B8 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 43.3% C 0.194 H 274.0°. Best body text is #FFFFFF at 8.61:1 contrast (WCAG AA passes).

Color values

HEX	#3739B8
RGB	rgb(55, 57, 184)
HSL	hsl(239, 54%, 47%)
HSV	hsv(239, 70%, 72%)
CMYK	cmyk(70.1%, 69%, 0%, 27.8%)
CIE-LAB	lab(32.25, 40.65, -67.00)
CIE-LCH	lch(32.25, 78.36, 301.25°)
OKLab	oklab(43.29% 0.0137 -0.1936)
OKLCH	oklch(43.29% 0.194 274)
XYZ	xyz(11.6875, 7.1981, 46.1115)
Luminance	0.0720 (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

#3739B8 #B8B637

analogous

#377AB8 #3739B8 #7637B8

triadic

#3739B8 #B83739 #39B837

tetradic

#3739B8 #B8377A #B8B637 #37B876

square

#3739B8 #B8377A #B8B637 #37B876

split-complementary

#3739B8 #B87637 #7AB837

monochromatic

#1B1C5A #292A89 #3739B8 #5D5FCF #8D8EDD

Accessibility & contrast

On white

8.61

#3739B8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.44

#3739B8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739B8

8.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739B8	#FFFFFF	#000000	##FFFFFF
##3739B8	1.00	8.61	2.44	8.61
#FFFFFF	8.61	1.00	21.00	1.00
#000000	2.44	21.00	1.00	21.00
##FFFFFF	8.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BC

Deuteranopia (green-blind)

#0046B6

Tritanopia (blue-blind)

#005C74

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3739b8;
/* rgb */ color: rgb(55, 57, 184);
/* oklch */ color: oklch(43.3% 0.194 274.0);

Tailwind

colors: {
  custom: {
    50: '#8070ce',
    500: '#3739b8',
    950: '#000000',
  },
}

SCSS

$custom: #3739b8;
$custom-light: #8070ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3739b8",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 184
  },
  "hsl": {
    "h": 239.07,
    "s": 53.975,
    "l": 46.863
  },
  "oklch": {
    "l": 0.4329,
    "c": 0.19411,
    "h": 274
  },
  "luminance": 0.07199
}

Semantic roles & 50–950 ramp

primary

#3739B8

secondary

#C7C684

accent

#DB4ADD

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3739B8

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

Preview Lab → · Contrast checker → · Palette generator →