#3731BA#3731BA

#3731BA is a dark, highly saturated blue. Relative luminance 0.066; OKLCH L 42.3% C 0.205 H 275.1°. Best body text is #FFFFFF at 9.09:1 contrast (WCAG AA passes).

Color values

HEX	#3731BA
RGB	rgb(55, 49, 186)
HSL	hsl(243, 58%, 46%)
HSV	hsv(243, 74%, 73%)
CMYK	cmyk(70.4%, 73.7%, 0%, 27.1%)
CIE-LAB	lab(30.77, 45.96, -70.63)
CIE-LCH	lch(30.77, 84.27, 303.05°)
OKLab	oklab(42.29% 0.0181 -0.2042)
OKLCH	oklch(42.29% 0.205 275.1)
XYZ	xyz(11.5339, 6.5529, 47.1019)
Luminance	0.0655 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Sapphire (survey)

#2138AB

ΔE00 4.09

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3731BA #B4BA31

analogous

#316FBA #3731BA #7B31BA

triadic

#3731BA #BA3731 #31BA37

tetradic

#3731BA #BA316F #B4BA31 #31BA7B

square

#3731BA #BA316F #B4BA31 #31BA7B

split-complementary

#3731BA #BA7B31 #6FBA31

monochromatic

#1A1759 #29248A #3731BA #5B56D2 #8A86DF

Accessibility & contrast

On white

9.09

#3731BA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.31

#3731BA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3731BA

9.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3731BA	#FFFFFF	#000000	##FFFFFF
##3731BA	1.00	9.09	2.31	9.09
#FFFFFF	9.09	1.00	21.00	1.00
#000000	2.31	21.00	1.00	21.00
##FFFFFF	9.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FBE

Deuteranopia (green-blind)

#0042B8

Tritanopia (blue-blind)

#005873

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #3731ba;
/* rgb */ color: rgb(55, 49, 186);
/* oklch */ color: oklch(42.3% 0.205 275.1);

Tailwind

colors: {
  custom: {
    50: '#816bd0',
    500: '#3731ba',
    950: '#000000',
  },
}

SCSS

$custom: #3731ba;
$custom-light: #816bd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3731ba",
  "rgb": {
    "r": 55,
    "g": 49,
    "b": 186
  },
  "hsl": {
    "h": 242.628,
    "s": 58.298,
    "l": 46.078
  },
  "oklch": {
    "l": 0.42285,
    "c": 0.205,
    "h": 275.1
  },
  "luminance": 0.06554
}

Semantic roles & 50–950 ramp

primary

#3731BA

secondary

#C6C97E

accent

#E246DB

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3731BA

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

Preview Lab → · Contrast checker → · Palette generator →