#373FA3#373FA3

#373FA3 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.4% C 0.159 H 273.9°. Best body text is #FFFFFF at 8.74:1 contrast (WCAG AA passes).

Color values

HEX	#373FA3
RGB	rgb(55, 63, 163)
HSL	hsl(236, 50%, 43%)
HSV	hsv(236, 66%, 64%)
CMYK	cmyk(66.3%, 61.3%, 0%, 36.1%)
CIE-LAB	lab(31.83, 29.57, -55.15)
CIE-LCH	lch(31.83, 62.58, 298.20°)
OKLab	oklab(42.42% 0.0109 -0.1589)
OKLCH	oklch(42.42% 0.159 273.9)
XYZ	xyz(9.9617, 7.0107, 35.4715)
Luminance	0.0701 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373FA3 #A39B37

analogous

#3775A3 #373FA3 #6537A3

triadic

#373FA3 #A3373F #3FA337

tetradic

#373FA3 #A33775 #A39B37 #37A365

square

#373FA3 #A33775 #A39B37 #37A365

split-complementary

#373FA3 #A36537 #75A337

monochromatic

#181C47 #282D75 #373FA3 #525BC5 #8086D4

Accessibility & contrast

On white

8.74

#373FA3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.40

#373FA3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373FA3

8.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373FA3	#FFFFFF	#000000	##FFFFFF
##373FA3	1.00	8.74	2.40	8.74
#FFFFFF	8.74	1.00	21.00	1.00
#000000	2.40	21.00	1.00	21.00
##FFFFFF	8.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050A6

Deuteranopia (green-blind)

#0046A1

Tritanopia (blue-blind)

#00586B

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #373fa3;
/* rgb */ color: rgb(55, 63, 163);
/* oklch */ color: oklch(42.4% 0.159 273.9);

Tailwind

colors: {
  custom: {
    50: '#7b74bf',
    500: '#373fa3',
    950: '#000000',
  },
}

SCSS

$custom: #373fa3;
$custom-light: #7b74bf;
$custom-dark: #000000;

JSON

{
  "hex": "#373fa3",
  "rgb": {
    "r": 55,
    "g": 63,
    "b": 163
  },
  "hsl": {
    "h": 235.556,
    "s": 49.541,
    "l": 42.745
  },
  "oklch": {
    "l": 0.42415,
    "c": 0.15925,
    "h": 273.9
  },
  "luminance": 0.07012
}

Semantic roles & 50–950 ramp

primary

#373FA3

secondary

#BEB878

accent

#CF4FD9

background

#F8F7FB

surface

#EFEDF7

border

#CAC8D0

text

#0A0812

muted

#7C7B81

Preview Lab

Preview with #373FA3

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

Preview Lab → · Contrast checker → · Palette generator →