#3731C7#3731C7

#3731C7 is a dark, highly saturated blue. Relative luminance 0.071; OKLCH L 43.6% C 0.221 H 274.0°. Best body text is #FFFFFF at 8.65:1 contrast (WCAG AA passes).

Color values

HEX	#3731C7
RGB	rgb(55, 49, 199)
HSL	hsl(242, 60%, 49%)
HSV	hsv(242, 75%, 78%)
CMYK	cmyk(72.4%, 75.4%, 0%, 22%)
CIE-LAB	lab(32.10, 50.14, -76.07)
CIE-LCH	lch(32.10, 91.10, 303.39°)
OKLab	oklab(43.63% 0.0155 -0.22)
OKLCH	oklch(43.63% 0.221 274)
XYZ	xyz(12.9792, 7.1311, 54.7142)
Luminance	0.0713 (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

#3731C7 #C1C731

analogous

#3176C7 #3731C7 #8231C7

triadic

#3731C7 #C73731 #31C737

tetradic

#3731C7 #C73176 #C1C731 #31C782

square

#3731C7 #C73176 #C1C731 #31C782

split-complementary

#3731C7 #C78231 #76C731

monochromatic

#1C1965 #292596 #3731C7 #635ED7 #928FE3

Accessibility & contrast

On white

8.65

#3731C7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.43

#3731C7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3731C7

8.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3731C7	#FFFFFF	#000000	##FFFFFF
##3731C7	1.00	8.65	2.43	8.65
#FFFFFF	8.65	1.00	21.00	1.00
#000000	2.43	21.00	1.00	21.00
##FFFFFF	8.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052CB

Deuteranopia (green-blind)

#0044C4

Tritanopia (blue-blind)

#005D7A

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3731c7;
/* rgb */ color: rgb(55, 49, 199);
/* oklch */ color: oklch(43.6% 0.221 274.0);

Tailwind

colors: {
  custom: {
    50: '#846cd9',
    500: '#3731c7',
    950: '#000000',
  },
}

SCSS

$custom: #3731c7;
$custom-light: #846cd9;
$custom-dark: #000000;

JSON

{
  "hex": "#3731c7",
  "rgb": {
    "r": 55,
    "g": 49,
    "b": 199
  },
  "hsl": {
    "h": 242.4,
    "s": 60.484,
    "l": 48.627
  },
  "oklch": {
    "l": 0.43629,
    "c": 0.22058,
    "h": 274
  },
  "luminance": 0.07132
}

Semantic roles & 50–950 ramp

primary

#3731C7

secondary

#CBCE86

accent

#E444DD

background

#F8F6FD

surface

#F0EBFB

border

#CBC6D4

text

#0D0715

muted

#7D7A83

Preview Lab

Preview with #3731C7

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

Preview Lab → · Contrast checker → · Palette generator →