#373FB1#373FB1

#373FB1 is a dark, vivid blue. Relative luminance 0.075; OKLCH L 43.6% C 0.178 H 273.3°. Best body text is #FFFFFF at 8.37:1 contrast (WCAG AA passes).

Color values

HEX	#373FB1
RGB	rgb(55, 63, 177)
HSL	hsl(236, 53%, 45%)
HSV	hsv(236, 69%, 69%)
CMYK	cmyk(68.9%, 64.4%, 0%, 30.6%)
CIE-LAB	lab(33.01, 34.52, -61.61)
CIE-LCH	lch(33.01, 70.62, 299.26°)
OKLab	oklab(43.65% 0.0102 -0.1778)
OKLCH	oklch(43.65% 0.178 273.3)
XYZ	xyz(11.2862, 7.5405, 42.4471)
Luminance	0.0754 (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

#373FB1 #B1A937

analogous

#377CB1 #373FB1 #6C37B1

triadic

#373FB1 #B1373F #3FB137

tetradic

#373FB1 #B1377C #B1A937 #37B16C

square

#373FB1 #B1377C #B1A937 #37B16C

split-complementary

#373FB1 #B16C37 #7CB137

monochromatic

#1A1E54 #282E82 #373FB1 #5A61CC #888EDA

Accessibility & contrast

On white

8.37

#373FB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.51

#373FB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373FB1

8.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373FB1	#FFFFFF	#000000	##FFFFFF
##373FB1	1.00	8.37	2.51	8.37
#FFFFFF	8.37	1.00	21.00	1.00
#000000	2.51	21.00	1.00	21.00
##FFFFFF	8.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B5

Deuteranopia (green-blind)

#0048AF

Tritanopia (blue-blind)

#005C72

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #373fb1;
/* rgb */ color: rgb(55, 63, 177);
/* oklch */ color: oklch(43.6% 0.178 273.3);

Tailwind

colors: {
  custom: {
    50: '#7e74c9',
    500: '#373fb1',
    950: '#000000',
  },
}

SCSS

$custom: #373fb1;
$custom-light: #7e74c9;
$custom-dark: #000000;

JSON

{
  "hex": "#373fb1",
  "rgb": {
    "r": 55,
    "g": 63,
    "b": 177
  },
  "hsl": {
    "h": 236.066,
    "s": 52.586,
    "l": 45.49
  },
  "oklch": {
    "l": 0.43645,
    "c": 0.17813,
    "h": 273.3
  },
  "luminance": 0.07542
}

Semantic roles & 50–950 ramp

primary

#373FB1

secondary

#C4C080

accent

#D34CDC

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #373FB1

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

Preview Lab → · Contrast checker → · Palette generator →