#373CA6#373CA6

#373CA6 is a dark, vivid blue. Relative luminance 0.068; OKLCH L 42.1% C 0.167 H 274.6°. Best body text is #FFFFFF at 8.90:1 contrast (WCAG AA passes).

Color values

HEX	#373CA6
RGB	rgb(55, 60, 166)
HSL	hsl(237, 50%, 43%)
HSV	hsv(237, 67%, 65%)
CMYK	cmyk(66.9%, 63.9%, 0%, 34.9%)
CIE-LAB	lab(31.34, 32.56, -57.76)
CIE-LCH	lch(31.34, 66.31, 299.41°)
OKLab	oklab(42.13% 0.0133 -0.1666)
OKLCH	oklch(42.13% 0.167 274.6)
XYZ	xyz(10.0721, 6.7962, 36.8500)
Luminance	0.0680 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.20

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373CA6 #A6A137

analogous

#3773A6 #373CA6 #6937A6

triadic

#373CA6 #A6373C #3CA637

tetradic

#373CA6 #A63773 #A6A137 #37A669

square

#373CA6 #A63773 #A6A137 #37A669

split-complementary

#373CA6 #A66937 #73A637

monochromatic

#191B4A #282B78 #373CA6 #5459C6 #8286D6

Accessibility & contrast

On white

8.90

#373CA6 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.36

#373CA6 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373CA6

8.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373CA6	#FFFFFF	#000000	##FFFFFF
##373CA6	1.00	8.90	2.36	8.90
#FFFFFF	8.90	1.00	21.00	1.00
#000000	2.36	21.00	1.00	21.00
##FFFFFF	8.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FA9

Deuteranopia (green-blind)

#0045A4

Tritanopia (blue-blind)

#00576B

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #373ca6;
/* rgb */ color: rgb(55, 60, 166);
/* oklch */ color: oklch(42.1% 0.167 274.6);

Tailwind

colors: {
  custom: {
    50: '#7c72c1',
    500: '#373ca6',
    950: '#000000',
  },
}

SCSS

$custom: #373ca6;
$custom-light: #7c72c1;
$custom-dark: #000000;

JSON

{
  "hex": "#373ca6",
  "rgb": {
    "r": 55,
    "g": 60,
    "b": 166
  },
  "hsl": {
    "h": 237.297,
    "s": 50.226,
    "l": 43.333
  },
  "oklch": {
    "l": 0.4213,
    "c": 0.16709,
    "h": 274.6
  },
  "luminance": 0.06797
}

Semantic roles & 50–950 ramp

primary

#373CA6

secondary

#BFBC7A

accent

#D34EDA

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0B0812

muted

#7C7B81

Preview Lab

Preview with #373CA6

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

Preview Lab → · Contrast checker → · Palette generator →