#3731C9#3731C9

#3731C9 is a dark, highly saturated blue. Relative luminance 0.072; OKLCH L 43.8% C 0.223 H 273.9°. Best body text is #FFFFFF at 8.59:1 contrast (WCAG AA passes).

Color values

HEX	#3731C9
RGB	rgb(55, 49, 201)
HSL	hsl(242, 61%, 49%)
HSV	hsv(242, 76%, 79%)
CMYK	cmyk(72.6%, 75.6%, 0%, 21.2%)
CIE-LAB	lab(32.31, 50.77, -76.89)
CIE-LCH	lch(32.31, 92.14, 303.44°)
OKLab	oklab(43.84% 0.0151 -0.2224)
OKLCH	oklch(43.84% 0.223 273.9)
XYZ	xyz(13.2130, 7.2246, 55.9452)
Luminance	0.0723 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blurple

#5539CC

ΔE00 3.91

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3731C9 #C3C931

analogous

#3177C9 #3731C9 #8331C9

triadic

#3731C9 #C93731 #31C937

tetradic

#3731C9 #C93177 #C3C931 #31C983

square

#3731C9 #C93177 #C3C931 #31C983

split-complementary

#3731C9 #C98331 #77C931

monochromatic

#1C1967 #2A2598 #3731C9 #645FD8 #9490E4

Accessibility & contrast

On white

8.59

#3731C9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.45

#3731C9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3731C9

8.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3731C9	#FFFFFF	#000000	##FFFFFF
##3731C9	1.00	8.59	2.45	8.59
#FFFFFF	8.59	1.00	21.00	1.00
#000000	2.45	21.00	1.00	21.00
##FFFFFF	8.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053CD

Deuteranopia (green-blind)

#0045C6

Tritanopia (blue-blind)

#005E7B

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3731c9;
/* rgb */ color: rgb(55, 49, 201);
/* oklch */ color: oklch(43.8% 0.223 273.9);

Tailwind

colors: {
  custom: {
    50: '#846cdb',
    500: '#3731c9',
    950: '#000000',
  },
}

SCSS

$custom: #3731c9;
$custom-light: #846cdb;
$custom-dark: #000000;

JSON

{
  "hex": "#3731c9",
  "rgb": {
    "r": 55,
    "g": 49,
    "b": 201
  },
  "hsl": {
    "h": 242.368,
    "s": 60.8,
    "l": 49.02
  },
  "oklch": {
    "l": 0.43838,
    "c": 0.22294,
    "h": 273.9
  },
  "luminance": 0.07226
}

Semantic roles & 50–950 ramp

primary

#3731C9

secondary

#CCCF87

accent

#E444DE

background

#F9F6FD

surface

#F1EBFB

border

#CBC6D4

text

#0D0715

muted

#7E7A83

Preview Lab

Preview with #3731C9

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

Preview Lab → · Contrast checker → · Palette generator →