#3739CA#3739CA

#3739CA is a mid, highly saturated blue. Relative luminance 0.080; OKLCH L 45.1% C 0.216 H 272.9°. Best body text is #FFFFFF at 8.08:1 contrast (WCAG AA passes).

Color values

HEX	#3739CA
RGB	rgb(55, 57, 202)
HSL	hsl(239, 58%, 50%)
HSV	hsv(239, 73%, 79%)
CMYK	cmyk(72.8%, 71.8%, 0%, 20.8%)
CIE-LAB	lab(33.99, 46.68, -74.71)
CIE-LCH	lch(33.99, 88.09, 301.99°)
OKLab	oklab(45.06% 0.0111 -0.2161)
OKLCH	oklch(45.06% 0.216 272.9)
XYZ	xyz(13.6958, 8.0014, 56.6883)
Luminance	0.0800 (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

#3739CA #CAC837

analogous

#3782CA #3739CA #7F37CA

triadic

#3739CA #CA3739 #39CA37

tetradic

#3739CA #CA3782 #CAC837 #37CA7F

square

#3739CA #CA3782 #CAC837 #37CA7F

split-complementary

#3739CA #CA7F37 #82CA37

monochromatic

#1C1D6A #292B9B #3739CA #6769D7 #9899E4

Accessibility & contrast

On white

8.08

#3739CA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.60

#3739CA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739CA

8.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739CA	#FFFFFF	#000000	##FFFFFF
##3739CA	1.00	8.08	2.60	8.08
#FFFFFF	8.08	1.00	21.00	1.00
#000000	2.60	21.00	1.00	21.00
##FFFFFF	8.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057CE

Deuteranopia (green-blind)

#0049C7

Tritanopia (blue-blind)

#00627E

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3739ca;
/* rgb */ color: rgb(55, 57, 202);
/* oklch */ color: oklch(45.1% 0.216 272.9);

Tailwind

colors: {
  custom: {
    50: '#8471db',
    500: '#3739ca',
    950: '#000000',
  },
}

SCSS

$custom: #3739ca;
$custom-light: #8471db;
$custom-dark: #000000;

JSON

{
  "hex": "#3739ca",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 202
  },
  "hsl": {
    "h": 239.184,
    "s": 58.103,
    "l": 50.392
  },
  "oklch": {
    "l": 0.45056,
    "c": 0.21644,
    "h": 272.9
  },
  "luminance": 0.08003
}

Semantic roles & 50–950 ramp

primary

#3739CA

secondary

#CFCE8E

accent

#DF46E1

background

#F8F6FD

surface

#F0ECFB

border

#CBC7D4

text

#0D0815

muted

#7D7B83

Preview Lab

Preview with #3739CA

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

Preview Lab → · Contrast checker → · Palette generator →