#3728B7#3728B7

#3728B7 is a dark, highly saturated blue. Relative luminance 0.057; OKLCH L 40.8% C 0.210 H 276.4°. Best body text is #FFFFFF at 9.77:1 contrast (WCAG AA passes).

Color values

HEX	#3728B7
RGB	rgb(55, 40, 183)
HSL	hsl(246, 64%, 44%)
HSV	hsv(246, 78%, 72%)
CMYK	cmyk(69.9%, 78.1%, 0%, 28.2%)
CIE-LAB	lab(28.77, 49.80, -72.15)
CIE-LCH	lch(28.77, 87.67, 304.62°)
OKLab	oklab(40.78% 0.0232 -0.2085)
OKLCH	oklch(40.78% 0.21 276.4)
XYZ	xyz(10.8788, 5.7477, 45.3267)
Luminance	0.0575 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3728B7 #A8B728

analogous

#2860B7 #3728B7 #7E28B7

triadic

#3728B7 #B73728 #28B737

tetradic

#3728B7 #B72860 #A8B728 #28B77E

square

#3728B7 #B72860 #A8B728 #28B77E

split-complementary

#3728B7 #B77E28 #60B728

monochromatic

#191253 #281D85 #3728B7 #5546D6 #8378E1

Accessibility & contrast

On white

9.77

#3728B7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#3728B7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3728B7

9.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3728B7	#FFFFFF	#000000	##FFFFFF
##3728B7	1.00	9.77	2.15	9.77
#FFFFFF	9.77	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004ABB

Deuteranopia (green-blind)

#003EB5

Tritanopia (blue-blind)

#00536F

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #3728b7;
/* rgb */ color: rgb(55, 40, 183);
/* oklch */ color: oklch(40.8% 0.210 276.4);

Tailwind

colors: {
  custom: {
    50: '#8166ce',
    500: '#3728b7',
    950: '#000000',
  },
}

SCSS

$custom: #3728b7;
$custom-light: #8166ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3728b7",
  "rgb": {
    "r": 55,
    "g": 40,
    "b": 183
  },
  "hsl": {
    "h": 246.294,
    "s": 64.126,
    "l": 43.725
  },
  "oklch": {
    "l": 0.40782,
    "c": 0.20984,
    "h": 276.4
  },
  "luminance": 0.05749
}

Semantic roles & 50–950 ramp

primary

#3728B7

secondary

#C0C972

accent

#E741D6

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0614

muted

#7D7A82

Preview Lab

Preview with #3728B7

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

Preview Lab → · Contrast checker → · Palette generator →