#3728B0#3728B0

#3728B0 is a dark, highly saturated blue. Relative luminance 0.055; OKLCH L 40.0% C 0.202 H 277.1°. Best body text is #FFFFFF at 10.03:1 contrast (WCAG AA passes).

Color values

HEX	#3728B0
RGB	rgb(55, 40, 176)
HSL	hsl(247, 63%, 42%)
HSV	hsv(247, 77%, 69%)
CMYK	cmyk(68.8%, 77.3%, 0%, 31%)
CIE-LAB	lab(28.02, 47.63, -69.22)
CIE-LCH	lch(28.02, 84.02, 304.54°)
OKLab	oklab(40.03% 0.025 -0.2)
OKLCH	oklch(40.03% 0.202 277.1)
XYZ	xyz(10.1683, 5.4635, 41.5846)
Luminance	0.0546 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3728B0 #A1B028

analogous

#285DB0 #3728B0 #7B28B0

triadic

#3728B0 #B03728 #28B037

tetradic

#3728B0 #B0285D #A1B028 #28B07B

square

#3728B0 #B0285D #A1B028 #28B07B

split-complementary

#3728B0 #B07B28 #5DB028

monochromatic

#18114C #271D7E #3728B0 #5141D4 #7F73DF

Accessibility & contrast

On white

10.03

#3728B0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#3728B0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3728B0

10.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3728B0	#FFFFFF	#000000	##FFFFFF
##3728B0	1.00	10.03	2.09	10.03
#FFFFFF	10.03	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0048B4

Deuteranopia (green-blind)

#003CAE

Tritanopia (blue-blind)

#00506B

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #3728b0;
/* rgb */ color: rgb(55, 40, 176);
/* oklch */ color: oklch(40.0% 0.202 277.1);

Tailwind

colors: {
  custom: {
    50: '#8065c9',
    500: '#3728b0',
    950: '#000000',
  },
}

SCSS

$custom: #3728b0;
$custom-light: #8065c9;
$custom-dark: #000000;

JSON

{
  "hex": "#3728b0",
  "rgb": {
    "r": 55,
    "g": 40,
    "b": 176
  },
  "hsl": {
    "h": 246.618,
    "s": 62.963,
    "l": 42.353
  },
  "oklch": {
    "l": 0.40035,
    "c": 0.20157,
    "h": 277.1
  },
  "luminance": 0.05464
}

Semantic roles & 50–950 ramp

primary

#3728B0

secondary

#BDC66D

accent

#E642D4

background

#F8F6FC

surface

#F0EBF8

border

#CBC6D1

text

#0C0613

muted

#7D7A82

Preview Lab

Preview with #3728B0

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

Preview Lab → · Contrast checker → · Palette generator →