#3739CB#3739CB

#3739CB is a mid, highly saturated blue. Relative luminance 0.081; OKLCH L 45.2% C 0.218 H 272.9°. Best body text is #FFFFFF at 8.05:1 contrast (WCAG AA passes).

Color values

HEX	#3739CB
RGB	rgb(55, 57, 203)
HSL	hsl(239, 59%, 51%)
HSV	hsv(239, 73%, 80%)
CMYK	cmyk(72.9%, 71.9%, 0%, 20.4%)
CIE-LAB	lab(34.08, 47.01, -75.13)
CIE-LCH	lch(34.08, 88.62, 302.03°)
OKLab	oklab(45.16% 0.011 -0.2174)
OKLCH	oklch(45.16% 0.218 272.9)
XYZ	xyz(13.8146, 8.0489, 57.3139)
Luminance	0.0805 (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

#3739CB #CBC937

analogous

#3783CB #3739CB #7F37CB

triadic

#3739CB #CB3739 #39CB37

tetradic

#3739CB #CB3783 #CBC937 #37CB7F

square

#3739CB #CB3783 #CBC937 #37CB7F

split-complementary

#3739CB #CB7F37 #83CB37

monochromatic

#1C1D6C #292A9C #3739CB #6869D8 #9899E4

Accessibility & contrast

On white

8.05

#3739CB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.61

#3739CB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739CB

8.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739CB	#FFFFFF	#000000	##FFFFFF
##3739CB	1.00	8.05	2.61	8.05
#FFFFFF	8.05	1.00	21.00	1.00
#000000	2.61	21.00	1.00	21.00
##FFFFFF	8.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057CF

Deuteranopia (green-blind)

#0049C8

Tritanopia (blue-blind)

#00627E

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3739cb;
/* rgb */ color: rgb(55, 57, 203);
/* oklch */ color: oklch(45.2% 0.218 272.9);

Tailwind

colors: {
  custom: {
    50: '#8471dc',
    500: '#3739cb',
    950: '#000000',
  },
}

SCSS

$custom: #3739cb;
$custom-light: #8471dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3739cb",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 203
  },
  "hsl": {
    "h": 239.189,
    "s": 58.73,
    "l": 50.588
  },
  "oklch": {
    "l": 0.45157,
    "c": 0.21765,
    "h": 272.9
  },
  "luminance": 0.0805
}

Semantic roles & 50–950 ramp

primary

#3739CB

secondary

#D0CF8E

accent

#E046E2

background

#F8F6FD

surface

#F0ECFB

border

#CBC7D4

text

#0D0815

muted

#7D7B83

Preview Lab

Preview with #3739CB

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

Preview Lab → · Contrast checker → · Palette generator →