#3733BC#3733BC

#3733BC is a dark, highly saturated blue. Relative luminance 0.068; OKLCH L 42.8% C 0.205 H 274.6°. Best body text is #FFFFFF at 8.89:1 contrast (WCAG AA passes).

Color values

HEX	#3733BC
RGB	rgb(55, 51, 188)
HSL	hsl(242, 57%, 47%)
HSV	hsv(242, 73%, 74%)
CMYK	cmyk(70.7%, 72.9%, 0%, 26.3%)
CIE-LAB	lab(31.37, 45.49, -70.82)
CIE-LCH	lch(31.37, 84.17, 302.71°)
OKLab	oklab(42.77% 0.0166 -0.2048)
OKLCH	oklch(42.77% 0.205 274.6)
XYZ	xyz(11.8335, 6.8096, 48.2580)
Luminance	0.0681 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Sapphire (survey)

#2138AB

ΔE00 3.99

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3733BC #B8BC33

analogous

#3374BC #3733BC #7C33BC

triadic

#3733BC #BC3733 #33BC37

tetradic

#3733BC #BC3374 #B8BC33 #33BC7C

square

#3733BC #BC3374 #B8BC33 #33BC7C

split-complementary

#3733BC #BC7C33 #74BC33

monochromatic

#1B195C #29268C #3733BC #5D5AD2 #8D8ADF

Accessibility & contrast

On white

8.89

#3733BC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.36

#3733BC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3733BC

8.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3733BC	#FFFFFF	#000000	##FFFFFF
##3733BC	1.00	8.89	2.36	8.89
#FFFFFF	8.89	1.00	21.00	1.00
#000000	2.36	21.00	1.00	21.00
##FFFFFF	8.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050C0

Deuteranopia (green-blind)

#0043BA

Tritanopia (blue-blind)

#005A74

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #3733bc;
/* rgb */ color: rgb(55, 51, 188);
/* oklch */ color: oklch(42.8% 0.205 274.6);

Tailwind

colors: {
  custom: {
    50: '#816cd1',
    500: '#3733bc',
    950: '#000000',
  },
}

SCSS

$custom: #3733bc;
$custom-light: #816cd1;
$custom-dark: #000000;

JSON

{
  "hex": "#3733bc",
  "rgb": {
    "r": 55,
    "g": 51,
    "b": 188
  },
  "hsl": {
    "h": 241.752,
    "s": 57.322,
    "l": 46.863
  },
  "oklch": {
    "l": 0.42774,
    "c": 0.20543,
    "h": 274.6
  },
  "luminance": 0.06811
}

Semantic roles & 50–950 ramp

primary

#3733BC

secondary

#C7C981

accent

#E147DC

background

#F8F6FD

surface

#F0EBFA

border

#CBC6D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3733BC

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

Preview Lab → · Contrast checker → · Palette generator →