#3731BE#3731BE

#3731BE is a dark, highly saturated blue. Relative luminance 0.067; OKLCH L 42.7% C 0.210 H 274.7°. Best body text is #FFFFFF at 8.95:1 contrast (WCAG AA passes).

Color values

HEX	#3731BE
RGB	rgb(55, 49, 190)
HSL	hsl(243, 59%, 47%)
HSV	hsv(243, 74%, 75%)
CMYK	cmyk(71.1%, 74.2%, 0%, 25.5%)
CIE-LAB	lab(31.17, 47.26, -72.32)
CIE-LCH	lch(31.17, 86.39, 303.16°)
OKLab	oklab(42.7% 0.0173 -0.2091)
OKLCH	oklch(42.7% 0.21 274.7)
XYZ	xyz(11.9650, 6.7254, 49.3728)
Luminance	0.0673 (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

#3731BE #B8BE31

analogous

#3172BE #3731BE #7E31BE

triadic

#3731BE #BE3731 #31BE37

tetradic

#3731BE #BE3172 #B8BE31 #31BE7E

square

#3731BE #BE3172 #B8BE31 #31BE7E

split-complementary

#3731BE #BE7E31 #72BE31

monochromatic

#1B185D #29248D #3731BE #5D58D4 #8D89E1

Accessibility & contrast

On white

8.95

#3731BE on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.35

#3731BE on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3731BE

8.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3731BE	#FFFFFF	#000000	##FFFFFF
##3731BE	1.00	8.95	2.35	8.95
#FFFFFF	8.95	1.00	21.00	1.00
#000000	2.35	21.00	1.00	21.00
##FFFFFF	8.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050C2

Deuteranopia (green-blind)

#0043BB

Tritanopia (blue-blind)

#005A75

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #3731be;
/* rgb */ color: rgb(55, 49, 190);
/* oklch */ color: oklch(42.7% 0.210 274.7);

Tailwind

colors: {
  custom: {
    50: '#826bd3',
    500: '#3731be',
    950: '#000000',
  },
}

SCSS

$custom: #3731be;
$custom-light: #826bd3;
$custom-dark: #000000;

JSON

{
  "hex": "#3731be",
  "rgb": {
    "r": 55,
    "g": 49,
    "b": 190
  },
  "hsl": {
    "h": 242.553,
    "s": 58.996,
    "l": 46.863
  },
  "oklch": {
    "l": 0.42695,
    "c": 0.20984,
    "h": 274.7
  },
  "luminance": 0.06727
}

Semantic roles & 50–950 ramp

primary

#3731BE

secondary

#C7CA80

accent

#E246DC

background

#F8F6FD

surface

#F0EBFA

border

#CBC6D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3731BE

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

Preview Lab → · Contrast checker → · Palette generator →