#3728B1#3728B1

#3728B1 is a dark, highly saturated blue. Relative luminance 0.055; OKLCH L 40.1% C 0.203 H 277.0°. Best body text is #FFFFFF at 10.00:1 contrast (WCAG AA passes).

Color values

HEX	#3728B1
RGB	rgb(55, 40, 177)
HSL	hsl(247, 63%, 43%)
HSV	hsv(247, 77%, 69%)
CMYK	cmyk(68.9%, 77.4%, 0%, 30.6%)
CIE-LAB	lab(28.12, 47.95, -69.64)
CIE-LCH	lch(28.12, 84.55, 304.55°)
OKLab	oklab(40.14% 0.0247 -0.2012)
OKLCH	oklch(40.14% 0.203 277)
XYZ	xyz(10.2676, 5.5032, 42.1076)
Luminance	0.0550 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3728B1 #A2B128

analogous

#285EB1 #3728B1 #7B28B1

triadic

#3728B1 #B13728 #28B137

tetradic

#3728B1 #B1285E #A2B128 #28B17B

square

#3728B1 #B1285E #A2B128 #28B17B

split-complementary

#3728B1 #B17B28 #5EB128

monochromatic

#18114D #271D7F #3728B1 #5242D4 #8074E0

Accessibility & contrast

On white

10.00

#3728B1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#3728B1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3728B1

10.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3728B1	#FFFFFF	#000000	##FFFFFF
##3728B1	1.00	10.00	2.10	10.00
#FFFFFF	10.00	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0048B5

Deuteranopia (green-blind)

#003CAF

Tritanopia (blue-blind)

#00516B

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #3728b1;
/* rgb */ color: rgb(55, 40, 177);
/* oklch */ color: oklch(40.1% 0.203 277.0);

Tailwind

colors: {
  custom: {
    50: '#8065ca',
    500: '#3728b1',
    950: '#000000',
  },
}

SCSS

$custom: #3728b1;
$custom-light: #8065ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3728b1",
  "rgb": {
    "r": 55,
    "g": 40,
    "b": 177
  },
  "hsl": {
    "h": 246.569,
    "s": 63.134,
    "l": 42.549
  },
  "oklch": {
    "l": 0.40141,
    "c": 0.20275,
    "h": 277
  },
  "luminance": 0.05504
}

Semantic roles & 50–950 ramp

primary

#3728B1

secondary

#BDC76E

accent

#E642D4

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0613

muted

#7D7A82

Preview Lab

Preview with #3728B1

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

Preview Lab → · Contrast checker → · Palette generator →