#3733BB#3733BB

#3733BB is a dark, highly saturated blue. Relative luminance 0.068; OKLCH L 42.7% C 0.204 H 274.7°. Best body text is #FFFFFF at 8.92:1 contrast (WCAG AA passes).

Color values

HEX	#3733BB
RGB	rgb(55, 51, 187)
HSL	hsl(242, 57%, 47%)
HSV	hsv(242, 73%, 73%)
CMYK	cmyk(70.6%, 72.7%, 0%, 26.7%)
CIE-LAB	lab(31.27, 45.16, -70.39)
CIE-LCH	lch(31.27, 83.63, 302.68°)
OKLab	oklab(42.67% 0.0168 -0.2035)
OKLCH	oklch(42.67% 0.204 274.7)
XYZ	xyz(11.7260, 6.7666, 47.6922)
Luminance	0.0677 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Sapphire (survey)

#2138AB

ΔE00 3.90

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3733BB #B7BB33

analogous

#3373BB #3733BB #7B33BB

triadic

#3733BB #BB3733 #33BB37

tetradic

#3733BB #BB3373 #B7BB33 #33BB7B

square

#3733BB #BB3373 #B7BB33 #33BB7B

split-complementary

#3733BB #BB7B33 #73BB33

monochromatic

#1B195B #29268B #3733BB #5D59D2 #8C89DF

Accessibility & contrast

On white

8.92

#3733BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.35

#3733BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3733BB

8.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3733BB	#FFFFFF	#000000	##FFFFFF
##3733BB	1.00	8.92	2.35	8.92
#FFFFFF	8.92	1.00	21.00	1.00
#000000	2.35	21.00	1.00	21.00
##FFFFFF	8.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050BF

Deuteranopia (green-blind)

#0043B9

Tritanopia (blue-blind)

#005A74

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #3733bb;
/* rgb */ color: rgb(55, 51, 187);
/* oklch */ color: oklch(42.7% 0.204 274.7);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#3733bb",
  "rgb": {
    "r": 55,
    "g": 51,
    "b": 187
  },
  "hsl": {
    "h": 241.765,
    "s": 57.143,
    "l": 46.667
  },
  "oklch": {
    "l": 0.42673,
    "c": 0.20421,
    "h": 274.7
  },
  "luminance": 0.06768
}

Semantic roles & 50–950 ramp

primary

#3733BB

secondary

#C7C981

accent

#E047DC

background

#F8F6FD

surface

#F0EBFA

border

#CBC6D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3733BB

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

Preview Lab → · Contrast checker → · Palette generator →