#3F37E5#3F37E5

#3F37E5 is a mid, highly saturated blue. Relative luminance 0.094; OKLCH L 48.0% C 0.248 H 273.8°. Best body text is #FFFFFF at 7.27:1 contrast (WCAG AA passes).

Color values

HEX	#3F37E5
RGB	rgb(63, 55, 229)
HSL	hsl(243, 77%, 56%)
HSV	hsv(243, 76%, 90%)
CMYK	cmyk(72.5%, 76%, 0%, 10.2%)
CIE-LAB	lab(36.83, 57.04, -85.56)
CIE-LCH	lch(36.83, 102.83, 303.69°)
OKLab	oklab(48.01% 0.0164 -0.2475)
OKLCH	oklch(48.01% 0.248 273.8)
XYZ	xyz(17.5542, 9.4445, 75.0114)
Luminance	0.0945 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 4.08

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F37E5 #DDE537

analogous

#3786E5 #3F37E5 #9637E5

triadic

#3F37E5 #E53F37 #37E53F

tetradic

#3F37E5 #E53786 #DDE537 #37E596

square

#3F37E5 #E53786 #DDE537 #37E596

split-complementary

#3F37E5 #E59637 #86E537

monochromatic

#18138F #221AC5 #3F37E5 #736DEC #A7A3F3

Accessibility & contrast

On white

7.27

#3F37E5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.89

#3F37E5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37E5

7.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37E5	#FFFFFF	#000000	##FFFFFF
##3F37E5	1.00	7.27	2.89	7.27
#FFFFFF	7.27	1.00	21.00	1.00
#000000	2.89	21.00	1.00	21.00
##FFFFFF	7.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005FEA

Deuteranopia (green-blind)

#004EE2

Tritanopia (blue-blind)

#006B8D

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #3f37e5;
/* rgb */ color: rgb(63, 55, 229);
/* oklch */ color: oklch(48.0% 0.248 273.8);

Tailwind

colors: {
  custom: {
    50: '#8d71ef',
    500: '#3f37e5',
    950: '#000000',
  },
}

SCSS

$custom: #3f37e5;
$custom-light: #8d71ef;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37e5",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 229
  },
  "hsl": {
    "h": 242.759,
    "s": 76.991,
    "l": 55.686
  },
  "oklch": {
    "l": 0.48011,
    "c": 0.24806,
    "h": 273.8
  },
  "luminance": 0.09446
}

Semantic roles & 50–950 ramp

primary

#3F37E5

secondary

#DDE098

accent

#F434EB

background

#F9F7FE

surface

#F2EDFD

border

#CCC8D5

text

#0E0817

muted

#7E7B85

Preview Lab

Preview with #3F37E5

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

Preview Lab → · Contrast checker → · Palette generator →