#3728B3#3728B3

#3728B3 is a dark, highly saturated blue. Relative luminance 0.056; OKLCH L 40.4% C 0.205 H 276.8°. Best body text is #FFFFFF at 9.92:1 contrast (WCAG AA passes).

Color values

HEX	#3728B3
RGB	rgb(55, 40, 179)
HSL	hsl(246, 63%, 43%)
HSV	hsv(246, 78%, 70%)
CMYK	cmyk(69.3%, 77.7%, 0%, 29.8%)
CIE-LAB	lab(28.34, 48.57, -70.48)
CIE-LCH	lch(28.34, 85.59, 304.57°)
OKLab	oklab(40.35% 0.0242 -0.2037)
OKLCH	oklch(40.35% 0.205 276.8)
XYZ	xyz(10.4684, 5.5835, 43.1651)
Luminance	0.0558 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3728B3 #A4B328

analogous

#285EB3 #3728B3 #7C28B3

triadic

#3728B3 #B33728 #28B337

tetradic

#3728B3 #B3285E #A4B328 #28B37C

square

#3728B3 #B3285E #A4B328 #28B37C

split-complementary

#3728B3 #B37C28 #5EB328

monochromatic

#18124F #281D81 #3728B3 #5343D5 #8175E0

Accessibility & contrast

On white

9.92

#3728B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#3728B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3728B3

9.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3728B3	#FFFFFF	#000000	##FFFFFF
##3728B3	1.00	9.92	2.12	9.92
#FFFFFF	9.92	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0049B7

Deuteranopia (green-blind)

#003DB1

Tritanopia (blue-blind)

#00516D

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #3728b3;
/* rgb */ color: rgb(55, 40, 179);
/* oklch */ color: oklch(40.4% 0.205 276.8);

Tailwind

colors: {
  custom: {
    50: '#8065cb',
    500: '#3728b3',
    950: '#000000',
  },
}

SCSS

$custom: #3728b3;
$custom-light: #8065cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3728b3",
  "rgb": {
    "r": 55,
    "g": 40,
    "b": 179
  },
  "hsl": {
    "h": 246.475,
    "s": 63.47,
    "l": 42.941
  },
  "oklch": {
    "l": 0.40354,
    "c": 0.20513,
    "h": 276.8
  },
  "luminance": 0.05584
}

Semantic roles & 50–950 ramp

primary

#3728B3

secondary

#BEC86F

accent

#E641D5

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0613

muted

#7D7A82

Preview Lab

Preview with #3728B3

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

Preview Lab → · Contrast checker → · Palette generator →