#3937C9#3937C9

#3937C9 is a dark, highly saturated blue. Relative luminance 0.078; OKLCH L 44.8% C 0.217 H 273.9°. Best body text is #FFFFFF at 8.19:1 contrast (WCAG AA passes).

Color values

HEX	#3937C9
RGB	rgb(57, 55, 201)
HSL	hsl(241, 57%, 50%)
HSV	hsv(241, 73%, 79%)
CMYK	cmyk(71.6%, 72.6%, 0%, 21.2%)
CIE-LAB	lab(33.60, 47.68, -74.76)
CIE-LCH	lch(33.60, 88.67, 302.53°)
OKLab	oklab(44.78% 0.0146 -0.2162)
OKLCH	oklch(44.78% 0.217 273.9)
XYZ	xyz(13.5926, 7.8179, 56.0397)
Luminance	0.0782 (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

#3937C9 #C7C937

analogous

#377EC9 #3937C9 #8237C9

triadic

#3937C9 #C93937 #37C939

tetradic

#3937C9 #C9377E #C7C937 #37C982

square

#3937C9 #C9377E #C7C937 #37C982

split-complementary

#3937C9 #C98237 #7EC937

monochromatic

#1D1C69 #2B2999 #3937C9 #6967D6 #9897E3

Accessibility & contrast

On white

8.19

#3937C9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.56

#3937C9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3937C9

8.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3937C9	#FFFFFF	#000000	##FFFFFF
##3937C9	1.00	8.19	2.56	8.19
#FFFFFF	8.19	1.00	21.00	1.00
#000000	2.56	21.00	1.00	21.00
##FFFFFF	8.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056CD

Deuteranopia (green-blind)

#0048C6

Tritanopia (blue-blind)

#00617D

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #3937c9;
/* rgb */ color: rgb(57, 55, 201);
/* oklch */ color: oklch(44.8% 0.217 273.9);

Tailwind

colors: {
  custom: {
    50: '#856fdb',
    500: '#3937c9',
    950: '#000000',
  },
}

SCSS

$custom: #3937c9;
$custom-light: #856fdb;
$custom-dark: #000000;

JSON

{
  "hex": "#3937c9",
  "rgb": {
    "r": 57,
    "g": 55,
    "b": 201
  },
  "hsl": {
    "h": 240.822,
    "s": 57.48,
    "l": 50.196
  },
  "oklch": {
    "l": 0.44784,
    "c": 0.21672,
    "h": 273.9
  },
  "luminance": 0.07819
}

Semantic roles & 50–950 ramp

primary

#3937C9

secondary

#CECF8D

accent

#E147DF

background

#F9F6FD

surface

#F1ECFB

border

#CBC7D4

text

#0D0715

muted

#7E7A83

Preview Lab

Preview with #3937C9

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

Preview Lab → · Contrast checker → · Palette generator →