#3728B4#3728B4

#3728B4 is a dark, highly saturated blue. Relative luminance 0.056; OKLCH L 40.5% C 0.206 H 276.7°. Best body text is #FFFFFF at 9.88:1 contrast (WCAG AA passes).

Color values

HEX	#3728B4
RGB	rgb(55, 40, 180)
HSL	hsl(246, 64%, 43%)
HSV	hsv(246, 78%, 71%)
CMYK	cmyk(69.4%, 77.8%, 0%, 29.4%)
CIE-LAB	lab(28.44, 48.88, -70.90)
CIE-LCH	lch(28.44, 86.11, 304.58°)
OKLab	oklab(40.46% 0.024 -0.2049)
OKLCH	oklch(40.46% 0.206 276.7)
XYZ	xyz(10.5699, 5.6241, 43.6997)
Luminance	0.0563 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3728B4 #A5B428

analogous

#285FB4 #3728B4 #7D28B4

triadic

#3728B4 #B43728 #28B437

tetradic

#3728B4 #B4285F #A5B428 #28B47D

square

#3728B4 #B4285F #A5B428 #28B47D

split-complementary

#3728B4 #B47D28 #5FB428

monochromatic

#181250 #281D82 #3728B4 #5344D5 #8176E1

Accessibility & contrast

On white

9.88

#3728B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#3728B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3728B4

9.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3728B4	#FFFFFF	#000000	##FFFFFF
##3728B4	1.00	9.88	2.13	9.88
#FFFFFF	9.88	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0049B8

Deuteranopia (green-blind)

#003DB2

Tritanopia (blue-blind)

#00526D

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #3728b4;
/* rgb */ color: rgb(55, 40, 180);
/* oklch */ color: oklch(40.5% 0.206 276.7);

Tailwind

colors: {
  custom: {
    50: '#8065cc',
    500: '#3728b4',
    950: '#000000',
  },
}

SCSS

$custom: #3728b4;
$custom-light: #8065cc;
$custom-dark: #000000;

JSON

{
  "hex": "#3728b4",
  "rgb": {
    "r": 55,
    "g": 40,
    "b": 180
  },
  "hsl": {
    "h": 246.429,
    "s": 63.636,
    "l": 43.137
  },
  "oklch": {
    "l": 0.40461,
    "c": 0.20631,
    "h": 276.7
  },
  "luminance": 0.05625
}

Semantic roles & 50–950 ramp

primary

#3728B4

secondary

#BFC870

accent

#E741D5

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0614

muted

#7D7A82

Preview Lab

Preview with #3728B4

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

Preview Lab → · Contrast checker → · Palette generator →