#3731AD#3731AD

#3731AD is a dark, vivid blue. Relative luminance 0.060; OKLCH L 41.0% C 0.189 H 276.2°. Best body text is #FFFFFF at 9.52:1 contrast (WCAG AA passes).

Color values

HEX	#3731AD
RGB	rgb(55, 49, 173)
HSL	hsl(243, 56%, 44%)
HSV	hsv(243, 72%, 68%)
CMYK	cmyk(68.2%, 71.7%, 0%, 32.2%)
CIE-LAB	lab(29.48, 41.70, -65.01)
CIE-LCH	lch(29.48, 77.24, 302.68°)
OKLab	oklab(40.98% 0.0204 -0.1878)
OKLCH	oklch(40.98% 0.189 276.2)
XYZ	xyz(10.2142, 6.0251, 40.1517)
Luminance	0.0603 (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

#3731AD #A7AD31

analogous

#3169AD #3731AD #7531AD

triadic

#3731AD #AD3731 #31AD37

tetradic

#3731AD #AD3169 #A7AD31 #31AD75

square

#3731AD #AD3169 #A7AD31 #31AD75

split-complementary

#3731AD #AD7531 #69AD31

monochromatic

#19164E #28237D #3731AD #544ECD #827EDA

Accessibility & contrast

On white

9.52

#3731AD on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#3731AD on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3731AD

9.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3731AD	#FFFFFF	#000000	##FFFFFF
##3731AD	1.00	9.52	2.21	9.52
#FFFFFF	9.52	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004BB1

Deuteranopia (green-blind)

#0040AB

Tritanopia (blue-blind)

#00536B

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #3731ad;
/* rgb */ color: rgb(55, 49, 173);
/* oklch */ color: oklch(41.0% 0.189 276.2);

Tailwind

colors: {
  custom: {
    50: '#7e6ac7',
    500: '#3731ad',
    950: '#000000',
  },
}

SCSS

$custom: #3731ad;
$custom-light: #7e6ac7;
$custom-dark: #000000;

JSON

{
  "hex": "#3731ad",
  "rgb": {
    "r": 55,
    "g": 49,
    "b": 173
  },
  "hsl": {
    "h": 242.903,
    "s": 55.856,
    "l": 43.529
  },
  "oklch": {
    "l": 0.40977,
    "c": 0.18893,
    "h": 276.2
  },
  "luminance": 0.06026
}

Semantic roles & 50–950 ramp

primary

#3731AD

secondary

#C0C377

accent

#DF49D8

background

#F8F6FC

surface

#EFEBF8

border

#CAC6D1

text

#0B0613

muted

#7C7A82

Preview Lab

Preview with #3731AD

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

Preview Lab → · Contrast checker → · Palette generator →