#373FA4#373FA4

#373FA4 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.5% C 0.161 H 273.9°. Best body text is #FFFFFF at 8.72:1 contrast (WCAG AA passes).

Color values

HEX	#373FA4
RGB	rgb(55, 63, 164)
HSL	hsl(236, 50%, 43%)
HSV	hsv(236, 66%, 64%)
CMYK	cmyk(66.5%, 61.6%, 0%, 35.7%)
CIE-LAB	lab(31.91, 29.93, -55.62)
CIE-LCH	lch(31.91, 63.16, 298.28°)
OKLab	oklab(42.5% 0.0109 -0.1603)
OKLCH	oklch(42.5% 0.161 273.9)
XYZ	xyz(10.0517, 7.0467, 35.9452)
Luminance	0.0705 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373FA4 #A49C37

analogous

#3776A4 #373FA4 #6537A4

triadic

#373FA4 #A4373F #3FA437

tetradic

#373FA4 #A43776 #A49C37 #37A465

square

#373FA4 #A43776 #A49C37 #37A465

split-complementary

#373FA4 #A46537 #76A437

monochromatic

#181C48 #282D76 #373FA4 #535BC5 #8187D5

Accessibility & contrast

On white

8.72

#373FA4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.41

#373FA4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373FA4

8.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373FA4	#FFFFFF	#000000	##FFFFFF
##373FA4	1.00	8.72	2.41	8.72
#FFFFFF	8.72	1.00	21.00	1.00
#000000	2.41	21.00	1.00	21.00
##FFFFFF	8.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050A7

Deuteranopia (green-blind)

#0046A2

Tritanopia (blue-blind)

#00586B

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #373fa4;
/* rgb */ color: rgb(55, 63, 164);
/* oklch */ color: oklch(42.5% 0.161 273.9);

Tailwind

colors: {
  custom: {
    50: '#7b74c0',
    500: '#373fa4',
    950: '#000000',
  },
}

SCSS

$custom: #373fa4;
$custom-light: #7b74c0;
$custom-dark: #000000;

JSON

{
  "hex": "#373fa4",
  "rgb": {
    "r": 55,
    "g": 63,
    "b": 164
  },
  "hsl": {
    "h": 235.596,
    "s": 49.772,
    "l": 42.941
  },
  "oklch": {
    "l": 0.42501,
    "c": 0.16063,
    "h": 273.9
  },
  "luminance": 0.07048
}

Semantic roles & 50–950 ramp

primary

#373FA4

secondary

#BEB979

accent

#CF4FD9

background

#F8F7FB

surface

#EFEDF7

border

#CAC8D0

text

#0A0812

muted

#7C7B81

Preview Lab

Preview with #373FA4

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

Preview Lab → · Contrast checker → · Palette generator →