#373DBB#373DBB

#373DBB is a dark, vivid blue. Relative luminance 0.077; OKLCH L 44.2% C 0.193 H 273.2°. Best body text is #FFFFFF at 8.24:1 contrast (WCAG AA passes).

Color values

HEX	#373DBB
RGB	rgb(55, 61, 187)
HSL	hsl(237, 55%, 47%)
HSV	hsv(237, 71%, 73%)
CMYK	cmyk(70.6%, 67.4%, 0%, 26.7%)
CIE-LAB	lab(33.43, 39.24, -66.84)
CIE-LCH	lch(33.43, 77.51, 300.42°)
OKLab	oklab(44.22% 0.0108 -0.1932)
OKLCH	oklch(44.22% 0.193 273.2)
XYZ	xyz(12.2109, 7.7364, 47.8538)
Luminance	0.0774 (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

#373DBB #BBB537

analogous

#377FBB #373DBB #7337BB

triadic

#373DBB #BB373D #3DBB37

tetradic

#373DBB #BB377F #BBB537 #37BB73

square

#373DBB #BB377F #BBB537 #37BB73

split-complementary

#373DBB #BB7337 #7FBB37

monochromatic

#1B1E5C #292E8C #373DBB #5F64D0 #8E92DE

Accessibility & contrast

On white

8.24

#373DBB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.55

#373DBB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373DBB

8.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373DBB	#FFFFFF	#000000	##FFFFFF
##373DBB	1.00	8.24	2.55	8.24
#FFFFFF	8.24	1.00	21.00	1.00
#000000	2.55	21.00	1.00	21.00
##FFFFFF	8.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055BF

Deuteranopia (green-blind)

#0048B9

Tritanopia (blue-blind)

#005F77

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #373dbb;
/* rgb */ color: rgb(55, 61, 187);
/* oklch */ color: oklch(44.2% 0.193 273.2);

Tailwind

colors: {
  custom: {
    50: '#8073d1',
    500: '#373dbb',
    950: '#000000',
  },
}

SCSS

$custom: #373dbb;
$custom-light: #8073d1;
$custom-dark: #000000;

JSON

{
  "hex": "#373dbb",
  "rgb": {
    "r": 55,
    "g": 61,
    "b": 187
  },
  "hsl": {
    "h": 237.273,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.44224,
    "c": 0.19347,
    "h": 273.2
  },
  "luminance": 0.07738
}

Semantic roles & 50–950 ramp

primary

#373DBB

secondary

#C9C585

accent

#D74ADE

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #373DBB

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

Preview Lab → · Contrast checker → · Palette generator →