#3739B3#3739B3

#3739B3 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.8% C 0.188 H 274.4°. Best body text is #FFFFFF at 8.76:1 contrast (WCAG AA passes).

Color values

HEX	#3739B3
RGB	rgb(55, 57, 179)
HSL	hsl(239, 53%, 46%)
HSV	hsv(239, 69%, 70%)
CMYK	cmyk(69.3%, 68.2%, 0%, 29.8%)
CIE-LAB	lab(31.79, 38.94, -64.79)
CIE-LCH	lch(31.79, 75.60, 301.01°)
OKLab	oklab(42.81% 0.0143 -0.1872)
OKLCH	oklch(42.81% 0.188 274.4)
XYZ	xyz(11.1727, 6.9921, 43.3999)
Luminance	0.0699 (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

#3739B3 #B3B137

analogous

#3777B3 #3739B3 #7337B3

triadic

#3739B3 #B33739 #39B337

tetradic

#3739B3 #B33777 #B3B137 #37B373

square

#3739B3 #B33777 #B3B137 #37B373

split-complementary

#3739B3 #B37337 #77B337

monochromatic

#1A1B55 #292A84 #3739B3 #5B5DCD #8A8BDB

Accessibility & contrast

On white

8.76

#3739B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.40

#3739B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739B3

8.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739B3	#FFFFFF	#000000	##FFFFFF
##3739B3	1.00	8.76	2.40	8.76
#FFFFFF	8.76	1.00	21.00	1.00
#000000	2.40	21.00	1.00	21.00
##FFFFFF	8.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051B7

Deuteranopia (green-blind)

#0045B1

Tritanopia (blue-blind)

#005A71

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3739b3;
/* rgb */ color: rgb(55, 57, 179);
/* oklch */ color: oklch(42.8% 0.188 274.4);

Tailwind

colors: {
  custom: {
    50: '#7f70cb',
    500: '#3739b3',
    950: '#000000',
  },
}

SCSS

$custom: #3739b3;
$custom-light: #7f70cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3739b3",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 179
  },
  "hsl": {
    "h": 239.032,
    "s": 52.991,
    "l": 45.882
  },
  "oklch": {
    "l": 0.42813,
    "c": 0.18773,
    "h": 274.4
  },
  "luminance": 0.06993
}

Semantic roles & 50–950 ramp

primary

#3739B3

secondary

#C5C481

accent

#DA4BDC

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0B0713

muted

#7C7A82

Preview Lab

Preview with #3739B3

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

Preview Lab → · Contrast checker → · Palette generator →