#373FBB#373FBB

#373FBB is a dark, vivid blue. Relative luminance 0.080; OKLCH L 44.6% C 0.191 H 272.8°. Best body text is #FFFFFF at 8.10:1 contrast (WCAG AA passes).

Color values

HEX	#373FBB
RGB	rgb(55, 63, 187)
HSL	hsl(236, 55%, 47%)
HSV	hsv(236, 71%, 73%)
CMYK	cmyk(70.6%, 66.3%, 0%, 26.7%)
CIE-LAB	lab(33.89, 38.01, -66.09)
CIE-LCH	lch(33.89, 76.24, 299.91°)
OKLab	oklab(44.56% 0.0095 -0.191)
OKLCH	oklch(44.56% 0.191 272.8)
XYZ	xyz(12.3197, 7.9539, 47.8901)
Luminance	0.0795 (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

#373FBB #BBB337

analogous

#3781BB #373FBB #7137BB

triadic

#373FBB #BB373F #3FBB37

tetradic

#373FBB #BB3781 #BBB337 #37BB71

square

#373FBB #BB3781 #BBB337 #37BB71

split-complementary

#373FBB #BB7137 #81BB37

monochromatic

#1B1F5C #292F8C #373FBB #5F66D0 #8E93DE

Accessibility & contrast

On white

8.10

#373FBB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.59

#373FBB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373FBB

8.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373FBB	#FFFFFF	#000000	##FFFFFF
##373FBB	1.00	8.10	2.59	8.10
#FFFFFF	8.10	1.00	21.00	1.00
#000000	2.59	21.00	1.00	21.00
##FFFFFF	8.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056BF

Deuteranopia (green-blind)

#004AB9

Tritanopia (blue-blind)

#006077

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #373fbb;
/* rgb */ color: rgb(55, 63, 187);
/* oklch */ color: oklch(44.6% 0.191 272.8);

Tailwind

colors: {
  custom: {
    50: '#8074d1',
    500: '#373fbb',
    950: '#000000',
  },
}

SCSS

$custom: #373fbb;
$custom-light: #8074d1;
$custom-dark: #000000;

JSON

{
  "hex": "#373fbb",
  "rgb": {
    "r": 55,
    "g": 63,
    "b": 187
  },
  "hsl": {
    "h": 236.364,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.44557,
    "c": 0.19119,
    "h": 272.8
  },
  "luminance": 0.07955
}

Semantic roles & 50–950 ramp

primary

#373FBB

secondary

#C9C485

accent

#D54ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #373FBB

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

Preview Lab → · Contrast checker → · Palette generator →