#3737B8#3737B8

#3737B8 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 43.0% C 0.196 H 274.4°. Best body text is #FFFFFF at 8.75:1 contrast (WCAG AA passes).

Color values

HEX	#3737B8
RGB	rgb(55, 55, 184)
HSL	hsl(240, 54%, 47%)
HSV	hsv(240, 70%, 72%)
CMYK	cmyk(70.1%, 70.1%, 0%, 27.8%)
CIE-LAB	lab(31.82, 41.84, -67.71)
CIE-LCH	lch(31.82, 79.60, 301.71°)
OKLab	oklab(42.98% 0.0149 -0.1957)
OKLCH	oklch(42.98% 0.196 274.4)
XYZ	xyz(11.5906, 7.0042, 46.0792)
Luminance	0.0701 (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

#3737B8 #B8B837

analogous

#3778B8 #3737B8 #7837B8

triadic

#3737B8 #B83737 #37B837

tetradic

#3737B8 #B83778 #B8B837 #37B878

square

#3737B8 #B83778 #B8B837 #37B878

split-complementary

#3737B8 #B87837 #78B837

monochromatic

#1B1B5A #292989 #3737B8 #5D5DCF #8D8DDD

Accessibility & contrast

On white

8.75

#3737B8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.40

#3737B8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3737B8

8.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3737B8	#FFFFFF	#000000	##FFFFFF
##3737B8	1.00	8.75	2.40	8.75
#FFFFFF	8.75	1.00	21.00	1.00
#000000	2.40	21.00	1.00	21.00
##FFFFFF	8.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051BC

Deuteranopia (green-blind)

#0045B6

Tritanopia (blue-blind)

#005A73

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3737b8;
/* rgb */ color: rgb(55, 55, 184);
/* oklch */ color: oklch(43.0% 0.196 274.4);

Tailwind

colors: {
  custom: {
    50: '#806fce',
    500: '#3737b8',
    950: '#000000',
  },
}

SCSS

$custom: #3737b8;
$custom-light: #806fce;
$custom-dark: #000000;

JSON

{
  "hex": "#3737b8",
  "rgb": {
    "r": 55,
    "g": 55,
    "b": 184
  },
  "hsl": {
    "h": 240,
    "s": 53.975,
    "l": 46.863
  },
  "oklch": {
    "l": 0.42976,
    "c": 0.1963,
    "h": 274.4
  },
  "luminance": 0.07005
}

Semantic roles & 50–950 ramp

primary

#3737B8

secondary

#C7C784

accent

#DD4ADD

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3737B8

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

Preview Lab → · Contrast checker → · Palette generator →