#3737BE#3737BE

#3737BE is a dark, highly saturated blue. Relative luminance 0.073; OKLCH L 43.6% C 0.204 H 273.9°. Best body text is #FFFFFF at 8.56:1 contrast (WCAG AA passes).

Color values

HEX	#3737BE
RGB	rgb(55, 55, 190)
HSL	hsl(240, 55%, 48%)
HSV	hsv(240, 71%, 75%)
CMYK	cmyk(71.1%, 71.1%, 0%, 25.5%)
CIE-LAB	lab(32.39, 43.85, -70.31)
CIE-LCH	lch(32.39, 82.86, 301.95°)
OKLab	oklab(43.57% 0.014 -0.2033)
OKLCH	oklch(43.57% 0.204 273.9)
XYZ	xyz(12.2329, 7.2611, 49.4621)
Luminance	0.0726 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Sapphire (survey)

#2138AB

ΔE00 3.80

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3737BE #BEBE37

analogous

#377ABE #3737BE #7A37BE

triadic

#3737BE #BE3737 #37BE37

tetradic

#3737BE #BE377A #BEBE37 #37BE7A

square

#3737BE #BE377A #BEBE37 #37BE7A

split-complementary

#3737BE #BE7A37 #7ABE37

monochromatic

#1C1C5F #29298F #3737BE #6161D1 #9090DF

Accessibility & contrast

On white

8.56

#3737BE on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.45

#3737BE on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3737BE

8.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3737BE	#FFFFFF	#000000	##FFFFFF
##3737BE	1.00	8.56	2.45	8.56
#FFFFFF	8.56	1.00	21.00	1.00
#000000	2.45	21.00	1.00	21.00
##FFFFFF	8.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053C2

Deuteranopia (green-blind)

#0046BC

Tritanopia (blue-blind)

#005D77

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3737be;
/* rgb */ color: rgb(55, 55, 190);
/* oklch */ color: oklch(43.6% 0.204 273.9);

Tailwind

colors: {
  custom: {
    50: '#816fd3',
    500: '#3737be',
    950: '#000000',
  },
}

SCSS

$custom: #3737be;
$custom-light: #816fd3;
$custom-dark: #000000;

JSON

{
  "hex": "#3737be",
  "rgb": {
    "r": 55,
    "g": 55,
    "b": 190
  },
  "hsl": {
    "h": 240,
    "s": 55.102,
    "l": 48.039
  },
  "oklch": {
    "l": 0.43565,
    "c": 0.20377,
    "h": 273.9
  },
  "luminance": 0.07262
}

Semantic roles & 50–950 ramp

primary

#3737BE

secondary

#CACA87

accent

#DE49DE

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3737BE

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

Preview Lab → · Contrast checker → · Palette generator →