#3720B4#3720B4

#3720B4 is a dark, highly saturated blue. Relative luminance 0.051; OKLCH L 39.5% C 0.213 H 277.4°. Best body text is #FFFFFF at 10.35:1 contrast (WCAG AA passes).

Color values

HEX	#3720B4
RGB	rgb(55, 32, 180)
HSL	hsl(249, 70%, 42%)
HSV	hsv(249, 82%, 71%)
CMYK	cmyk(69.4%, 82.2%, 0%, 29.4%)
CIE-LAB	lab(27.13, 52.69, -73.08)
CIE-LCH	lch(27.13, 90.09, 305.79°)
OKLab	oklab(39.55% 0.0275 -0.2111)
OKLCH	oklch(39.55% 0.213 277.4)
XYZ	xyz(10.3276, 5.1396, 43.6189)
Luminance	0.0514 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3720B4 #9DB420

analogous

#2053B4 #3720B4 #8120B4

triadic

#3720B4 #B43720 #20B437

tetradic

#3720B4 #B42053 #9DB420 #20B481

square

#3720B4 #B42053 #9DB420 #20B481

split-complementary

#3720B4 #B48120 #53B420

monochromatic

#170E4C #271780 #3720B4 #5036DB #7D6AE4

Accessibility & contrast

On white

10.35

#3720B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#3720B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3720B4

10.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3720B4	#FFFFFF	#000000	##FFFFFF
##3720B4	1.00	10.35	2.03	10.35
#FFFFFF	10.35	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0046B8

Deuteranopia (green-blind)

#003AB1

Tritanopia (blue-blind)

#004F6C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #3720b4;
/* rgb */ color: rgb(55, 32, 180);
/* oklch */ color: oklch(39.5% 0.213 277.4);

Tailwind

colors: {
  custom: {
    50: '#8161cc',
    500: '#3720b4',
    950: '#000000',
  },
}

SCSS

$custom: #3720b4;
$custom-light: #8161cc;
$custom-dark: #000000;

JSON

{
  "hex": "#3720b4",
  "rgb": {
    "r": 55,
    "g": 32,
    "b": 180
  },
  "hsl": {
    "h": 249.324,
    "s": 69.811,
    "l": 41.569
  },
  "oklch": {
    "l": 0.39547,
    "c": 0.21292,
    "h": 277.4
  },
  "luminance": 0.05141
}

Semantic roles & 50–950 ramp

primary

#3720B4

secondary

#BBCA66

accent

#ED3BD1

background

#F8F5FC

surface

#F0EAF9

border

#CBC6D2

text

#0C0514

muted

#7D7982

Preview Lab

Preview with #3720B4

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

Preview Lab → · Contrast checker → · Palette generator →