#3737BF#3737BF

#3737BF is a dark, highly saturated blue. Relative luminance 0.073; OKLCH L 43.7% C 0.205 H 273.9°. Best body text is #FFFFFF at 8.53:1 contrast (WCAG AA passes).

Color values

HEX	#3737BF
RGB	rgb(55, 55, 191)
HSL	hsl(240, 55%, 48%)
HSV	hsv(240, 71%, 75%)
CMYK	cmyk(71.2%, 71.2%, 0%, 25.1%)
CIE-LAB	lab(32.49, 44.18, -70.74)
CIE-LCH	lch(32.49, 83.40, 301.99°)
OKLab	oklab(43.66% 0.0139 -0.2045)
OKLCH	oklch(43.66% 0.205 273.9)
XYZ	xyz(12.3426, 7.3050, 50.0397)
Luminance	0.0731 (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

#3737BF #BFBF37

analogous

#377BBF #3737BF #7B37BF

triadic

#3737BF #BF3737 #37BF37

tetradic

#3737BF #BF377B #BFBF37 #37BF7B

square

#3737BF #BF377B #BFBF37 #37BF7B

split-complementary

#3737BF #BF7B37 #7BBF37

monochromatic

#1C1C60 #29298F #3737BF #6262D2 #9191DF

Accessibility & contrast

On white

8.53

#3737BF on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.46

#3737BF on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3737BF

8.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3737BF	#FFFFFF	#000000	##FFFFFF
##3737BF	1.00	8.53	2.46	8.53
#FFFFFF	8.53	1.00	21.00	1.00
#000000	2.46	21.00	1.00	21.00
##FFFFFF	8.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053C3

Deuteranopia (green-blind)

#0046BD

Tritanopia (blue-blind)

#005D77

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3737bf;
/* rgb */ color: rgb(55, 55, 191);
/* oklch */ color: oklch(43.7% 0.205 273.9);

Tailwind

colors: {
  custom: {
    50: '#826fd4',
    500: '#3737bf',
    950: '#000000',
  },
}

SCSS

$custom: #3737bf;
$custom-light: #826fd4;
$custom-dark: #000000;

JSON

{
  "hex": "#3737bf",
  "rgb": {
    "r": 55,
    "g": 55,
    "b": 191
  },
  "hsl": {
    "h": 240,
    "s": 55.285,
    "l": 48.235
  },
  "oklch": {
    "l": 0.43664,
    "c": 0.20501,
    "h": 273.9
  },
  "luminance": 0.07306
}

Semantic roles & 50–950 ramp

primary

#3737BF

secondary

#CACA88

accent

#DF49DF

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3737BF

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

Preview Lab → · Contrast checker → · Palette generator →