#3731AC#3731AC

#3731AC is a dark, vivid blue. Relative luminance 0.060; OKLCH L 40.9% C 0.188 H 276.3°. Best body text is #FFFFFF at 9.56:1 contrast (WCAG AA passes).

Color values

HEX	#3731AC
RGB	rgb(55, 49, 172)
HSL	hsl(243, 56%, 43%)
HSV	hsv(243, 72%, 67%)
CMYK	cmyk(68%, 71.5%, 0%, 32.5%)
CIE-LAB	lab(29.38, 41.37, -64.57)
CIE-LCH	lch(29.38, 76.69, 302.65°)
OKLab	oklab(40.88% 0.0206 -0.1865)
OKLCH	oklch(40.88% 0.188 276.3)
XYZ	xyz(10.1178, 5.9865, 39.6440)
Luminance	0.0599 (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

#3731AC #A6AC31

analogous

#3168AC #3731AC #7431AC

triadic

#3731AC #AC3731 #31AC37

tetradic

#3731AC #AC3168 #A6AC31 #31AC74

square

#3731AC #AC3168 #A6AC31 #31AC74

split-complementary

#3731AC #AC7431 #68AC31

monochromatic

#19164D #28237C #3731AC #544ECC #827DDA

Accessibility & contrast

On white

9.56

#3731AC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.20

#3731AC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3731AC

9.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3731AC	#FFFFFF	#000000	##FFFFFF
##3731AC	1.00	9.56	2.20	9.56
#FFFFFF	9.56	1.00	21.00	1.00
#000000	2.20	21.00	1.00	21.00
##FFFFFF	9.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004BB0

Deuteranopia (green-blind)

#0040AA

Tritanopia (blue-blind)

#00536B

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #3731ac;
/* rgb */ color: rgb(55, 49, 172);
/* oklch */ color: oklch(40.9% 0.188 276.3);

Tailwind

colors: {
  custom: {
    50: '#7e6ac6',
    500: '#3731ac',
    950: '#000000',
  },
}

SCSS

$custom: #3731ac;
$custom-light: #7e6ac6;
$custom-dark: #000000;

JSON

{
  "hex": "#3731ac",
  "rgb": {
    "r": 55,
    "g": 49,
    "b": 172
  },
  "hsl": {
    "h": 242.927,
    "s": 55.656,
    "l": 43.333
  },
  "oklch": {
    "l": 0.40878,
    "c": 0.18767,
    "h": 276.3
  },
  "luminance": 0.05987
}

Semantic roles & 50–950 ramp

primary

#3731AC

secondary

#BFC376

accent

#DF49D8

background

#F8F6FC

surface

#EFEBF8

border

#CAC6D1

text

#0B0613

muted

#7C7A82

Preview Lab

Preview with #3731AC

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

Preview Lab → · Contrast checker → · Palette generator →