#3728A4#3728A4

#3728A4 is a dark, vivid blue. Relative luminance 0.050; OKLCH L 38.8% C 0.187 H 278.6°. Best body text is #FFFFFF at 10.49:1 contrast (WCAG AA passes).

Color values

HEX	#3728A4
RGB	rgb(55, 40, 164)
HSL	hsl(247, 61%, 40%)
HSV	hsv(247, 76%, 64%)
CMYK	cmyk(66.5%, 75.6%, 0%, 35.7%)
CIE-LAB	lab(26.76, 43.86, -64.06)
CIE-LCH	lch(26.76, 77.64, 304.40°)
OKLab	oklab(38.78% 0.0278 -0.185)
OKLCH	oklch(38.78% 0.187 278.6)
XYZ	xyz(9.0330, 5.0094, 35.6056)
Luminance	0.0501 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3728A4 #95A428

analogous

#2857A4 #3728A4 #7528A4

triadic

#3728A4 #A43728 #28A437

tetradic

#3728A4 #A42857 #95A428 #28A475

square

#3728A4 #A42857 #95A428 #28A475

split-complementary

#3728A4 #A47528 #57A428

monochromatic

#161042 #271C73 #3728A4 #4C3ACF #796BDB

Accessibility & contrast

On white

10.49

#3728A4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#3728A4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3728A4

10.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3728A4	#FFFFFF	#000000	##FFFFFF
##3728A4	1.00	10.49	2.00	10.49
#FFFFFF	10.49	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0044A8

Deuteranopia (green-blind)

#003AA2

Tritanopia (blue-blind)

#004C64

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #3728a4;
/* rgb */ color: rgb(55, 40, 164);
/* oklch */ color: oklch(38.8% 0.187 278.6);

Tailwind

colors: {
  custom: {
    50: '#7d64c0',
    500: '#3728a4',
    950: '#000000',
  },
}

SCSS

$custom: #3728a4;
$custom-light: #7d64c0;
$custom-dark: #000000;

JSON

{
  "hex": "#3728a4",
  "rgb": {
    "r": 55,
    "g": 40,
    "b": 164
  },
  "hsl": {
    "h": 247.258,
    "s": 60.784,
    "l": 40
  },
  "oklch": {
    "l": 0.38778,
    "c": 0.18708,
    "h": 278.6
  },
  "luminance": 0.0501
}

Semantic roles & 50–950 ramp

primary

#3728A4

secondary

#B6C166

accent

#E444D1

background

#F8F6FC

surface

#EFEBF8

border

#CAC6D1

text

#0B0612

muted

#7C7A81

Preview Lab

Preview with #3728A4

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

Preview Lab → · Contrast checker → · Palette generator →