#3739B2#3739B2

#3739B2 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.7% C 0.186 H 274.4°. Best body text is #FFFFFF at 8.78:1 contrast (WCAG AA passes).

Color values

HEX	#3739B2
RGB	rgb(55, 57, 178)
HSL	hsl(239, 53%, 46%)
HSV	hsv(239, 69%, 70%)
CMYK	cmyk(69.1%, 68%, 0%, 30.2%)
CIE-LAB	lab(31.70, 38.60, -64.35)
CIE-LCH	lch(31.70, 75.04, 300.96°)
OKLab	oklab(42.72% 0.0144 -0.1859)
OKLCH	oklch(42.72% 0.186 274.4)
XYZ	xyz(11.0719, 6.9518, 42.8692)
Luminance	0.0695 (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

#3739B2 #B2B037

analogous

#3777B2 #3739B2 #7237B2

triadic

#3739B2 #B23739 #39B237

tetradic

#3739B2 #B23777 #B2B037 #37B272

square

#3739B2 #B23777 #B2B037 #37B272

split-complementary

#3739B2 #B27237 #77B237

monochromatic

#1A1B54 #292A83 #3739B2 #5A5CCC #898ADB

Accessibility & contrast

On white

8.78

#3739B2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.39

#3739B2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739B2

8.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739B2	#FFFFFF	#000000	##FFFFFF
##3739B2	1.00	8.78	2.39	8.78
#FFFFFF	8.78	1.00	21.00	1.00
#000000	2.39	21.00	1.00	21.00
##FFFFFF	8.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050B6

Deuteranopia (green-blind)

#0045B0

Tritanopia (blue-blind)

#005971

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3739b2;
/* rgb */ color: rgb(55, 57, 178);
/* oklch */ color: oklch(42.7% 0.186 274.4);

Tailwind

colors: {
  custom: {
    50: '#7f70ca',
    500: '#3739b2',
    950: '#000000',
  },
}

SCSS

$custom: #3739b2;
$custom-light: #7f70ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3739b2",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 178
  },
  "hsl": {
    "h": 239.024,
    "s": 52.79,
    "l": 45.686
  },
  "oklch": {
    "l": 0.42719,
    "c": 0.18645,
    "h": 274.4
  },
  "luminance": 0.06953
}

Semantic roles & 50–950 ramp

primary

#3739B2

secondary

#C5C480

accent

#DA4CDC

background

#F8F6FC

surface

#EFECF9

border

#CAC7D2

text

#0B0713

muted

#7C7A82

Preview Lab

Preview with #3739B2

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

Preview Lab → · Contrast checker → · Palette generator →