#3731BF#3731BF

#3731BF is a dark, highly saturated blue. Relative luminance 0.068; OKLCH L 42.8% C 0.211 H 274.6°. Best body text is #FFFFFF at 8.92:1 contrast (WCAG AA passes).

Color values

HEX	#3731BF
RGB	rgb(55, 49, 191)
HSL	hsl(243, 59%, 47%)
HSV	hsv(243, 74%, 75%)
CMYK	cmyk(71.2%, 74.3%, 0%, 25.1%)
CIE-LAB	lab(31.28, 47.58, -72.74)
CIE-LCH	lch(31.28, 86.92, 303.19°)
OKLab	oklab(42.8% 0.0171 -0.2103)
OKLCH	oklch(42.8% 0.211 274.6)
XYZ	xyz(12.0747, 6.7693, 49.9504)
Luminance	0.0677 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3731BF #B9BF31

analogous

#3172BF #3731BF #7E31BF

triadic

#3731BF #BF3731 #31BF37

tetradic

#3731BF #BF3172 #B9BF31 #31BF7E

square

#3731BF #BF3172 #B9BF31 #31BF7E

split-complementary

#3731BF #BF7E31 #72BF31

monochromatic

#1B185E #29258E #3731BF #5E59D4 #8D8AE1

Accessibility & contrast

On white

8.92

#3731BF on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.35

#3731BF on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3731BF

8.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3731BF	#FFFFFF	#000000	##FFFFFF
##3731BF	1.00	8.92	2.35	8.92
#FFFFFF	8.92	1.00	21.00	1.00
#000000	2.35	21.00	1.00	21.00
##FFFFFF	8.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050C3

Deuteranopia (green-blind)

#0043BC

Tritanopia (blue-blind)

#005A76

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #3731bf;
/* rgb */ color: rgb(55, 49, 191);
/* oklch */ color: oklch(42.8% 0.211 274.6);

Tailwind

colors: {
  custom: {
    50: '#826bd4',
    500: '#3731bf',
    950: '#000000',
  },
}

SCSS

$custom: #3731bf;
$custom-light: #826bd4;
$custom-dark: #000000;

JSON

{
  "hex": "#3731bf",
  "rgb": {
    "r": 55,
    "g": 49,
    "b": 191
  },
  "hsl": {
    "h": 242.535,
    "s": 59.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.42798,
    "c": 0.21104,
    "h": 274.6
  },
  "luminance": 0.0677
}

Semantic roles & 50–950 ramp

primary

#3731BF

secondary

#C8CB81

accent

#E245DC

background

#F8F6FD

surface

#F0EBFA

border

#CBC6D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3731BF

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

Preview Lab → · Contrast checker → · Palette generator →