#3737B7#3737B7

#3737B7 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.9% C 0.195 H 274.4°. Best body text is #FFFFFF at 8.78:1 contrast (WCAG AA passes).

Color values

HEX	#3737B7
RGB	rgb(55, 55, 183)
HSL	hsl(240, 54%, 47%)
HSV	hsv(240, 70%, 72%)
CMYK	cmyk(69.9%, 69.9%, 0%, 28.2%)
CIE-LAB	lab(31.72, 41.51, -67.28)
CIE-LCH	lch(31.72, 79.05, 301.67°)
OKLab	oklab(42.88% 0.0151 -0.1945)
OKLCH	oklch(42.88% 0.195 274.4)
XYZ	xyz(11.4861, 6.9624, 45.5291)
Luminance	0.0696 (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

#3737B7 #B7B737

analogous

#3777B7 #3737B7 #7737B7

triadic

#3737B7 #B73737 #37B737

tetradic

#3737B7 #B73777 #B7B737 #37B777

square

#3737B7 #B73777 #B7B737 #37B777

split-complementary

#3737B7 #B77737 #77B737

monochromatic

#1B1B59 #292988 #3737B7 #5D5DCE #8C8CDC

Accessibility & contrast

On white

8.78

#3737B7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.39

#3737B7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3737B7

8.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3737B7	#FFFFFF	#000000	##FFFFFF
##3737B7	1.00	8.78	2.39	8.78
#FFFFFF	8.78	1.00	21.00	1.00
#000000	2.39	21.00	1.00	21.00
##FFFFFF	8.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051BB

Deuteranopia (green-blind)

#0045B5

Tritanopia (blue-blind)

#005A73

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3737b7;
/* rgb */ color: rgb(55, 55, 183);
/* oklch */ color: oklch(42.9% 0.195 274.4);

Tailwind

colors: {
  custom: {
    50: '#806fce',
    500: '#3737b7',
    950: '#000000',
  },
}

SCSS

$custom: #3737b7;
$custom-light: #806fce;
$custom-dark: #000000;

JSON

{
  "hex": "#3737b7",
  "rgb": {
    "r": 55,
    "g": 55,
    "b": 183
  },
  "hsl": {
    "h": 240,
    "s": 53.782,
    "l": 46.667
  },
  "oklch": {
    "l": 0.42878,
    "c": 0.19503,
    "h": 274.4
  },
  "luminance": 0.06963
}

Semantic roles & 50–950 ramp

primary

#3737B7

secondary

#C7C783

accent

#DD4BDD

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3737B7

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

Preview Lab → · Contrast checker → · Palette generator →