#3739C7#3739C7

#3739C7 is a dark, highly saturated blue. Relative luminance 0.079; OKLCH L 44.8% C 0.213 H 273.1°. Best body text is #FFFFFF at 8.16:1 contrast (WCAG AA passes).

Color values

HEX	#3739C7
RGB	rgb(55, 57, 199)
HSL	hsl(239, 57%, 50%)
HSV	hsv(239, 72%, 78%)
CMYK	cmyk(72.4%, 71.4%, 0%, 22%)
CIE-LAB	lab(33.69, 45.68, -73.45)
CIE-LCH	lch(33.69, 86.50, 301.88°)
OKLab	oklab(44.76% 0.0116 -0.2125)
OKLCH	oklch(44.76% 0.213 273.1)
XYZ	xyz(13.3440, 7.8607, 54.8358)
Luminance	0.0786 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue Blue

#2242C7

ΔE00 3.33

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3739C7 #C7C537

analogous

#3781C7 #3739C7 #7D37C7

triadic

#3739C7 #C73739 #39C737

tetradic

#3739C7 #C73781 #C7C537 #37C77D

square

#3739C7 #C73781 #C7C537 #37C77D

split-complementary

#3739C7 #C77D37 #81C737

monochromatic

#1C1E67 #2A2B97 #3739C7 #6668D5 #9697E2

Accessibility & contrast

On white

8.16

#3739C7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.57

#3739C7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739C7

8.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739C7	#FFFFFF	#000000	##FFFFFF
##3739C7	1.00	8.16	2.57	8.16
#FFFFFF	8.16	1.00	21.00	1.00
#000000	2.57	21.00	1.00	21.00
##FFFFFF	8.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056CB

Deuteranopia (green-blind)

#0048C4

Tritanopia (blue-blind)

#00617C

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #3739c7;
/* rgb */ color: rgb(55, 57, 199);
/* oklch */ color: oklch(44.8% 0.213 273.1);

Tailwind

colors: {
  custom: {
    50: '#8371d9',
    500: '#3739c7',
    950: '#000000',
  },
}

SCSS

$custom: #3739c7;
$custom-light: #8371d9;
$custom-dark: #000000;

JSON

{
  "hex": "#3739c7",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 199
  },
  "hsl": {
    "h": 239.167,
    "s": 56.693,
    "l": 49.804
  },
  "oklch": {
    "l": 0.44757,
    "c": 0.21277,
    "h": 273.1
  },
  "luminance": 0.07862
}

Semantic roles & 50–950 ramp

primary

#3739C7

secondary

#CDCD8C

accent

#DE48E0

background

#F8F6FD

surface

#F0ECFB

border

#CBC7D4

text

#0C0815

muted

#7D7B83

Preview Lab

Preview with #3739C7

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

Preview Lab → · Contrast checker → · Palette generator →