#3F37D9#3F37D9

#3F37D9 is a mid, highly saturated blue. Relative luminance 0.088; OKLCH L 46.8% C 0.234 H 274.6°. Best body text is #FFFFFF at 7.61:1 contrast (WCAG AA passes).

Color values

HEX	#3F37D9
RGB	rgb(63, 55, 217)
HSL	hsl(243, 68%, 53%)
HSV	hsv(243, 75%, 85%)
CMYK	cmyk(71%, 74.7%, 0%, 14.9%)
CIE-LAB	lab(35.59, 53.34, -80.73)
CIE-LCH	lch(35.59, 96.76, 303.45°)
OKLab	oklab(46.78% 0.0188 -0.2335)
OKLCH	oklch(46.78% 0.234 274.6)
XYZ	xyz(15.9363, 8.7973, 66.4904)
Luminance	0.0880 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blurple

#5539CC

ΔE00 2.77

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F37D9 #D1D937

analogous

#3780D9 #3F37D9 #9037D9

triadic

#3F37D9 #D93F37 #37D93F

tetradic

#3F37D9 #D93780 #D1D937 #37D990

square

#3F37D9 #D93780 #D1D937 #37D990

split-complementary

#3F37D9 #D99037 #80D937

monochromatic

#1D187E #2922B1 #3F37D9 #706AE3 #A29EED

Accessibility & contrast

On white

7.61

#3F37D9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.76

#3F37D9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37D9

7.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37D9	#FFFFFF	#000000	##FFFFFF
##3F37D9	1.00	7.61	2.76	7.61
#FFFFFF	7.61	1.00	21.00	1.00
#000000	2.76	21.00	1.00	21.00
##FFFFFF	7.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BDE

Deuteranopia (green-blind)

#004CD6

Tritanopia (blue-blind)

#006686

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f37d9;
/* rgb */ color: rgb(63, 55, 217);
/* oklch */ color: oklch(46.8% 0.234 274.6);

Tailwind

colors: {
  custom: {
    50: '#8a70e6',
    500: '#3f37d9',
    950: '#000000',
  },
}

SCSS

$custom: #3f37d9;
$custom-light: #8a70e6;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37d9",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 217
  },
  "hsl": {
    "h": 242.963,
    "s": 68.067,
    "l": 53.333
  },
  "oklch": {
    "l": 0.46775,
    "c": 0.23424,
    "h": 274.6
  },
  "luminance": 0.08799
}

Semantic roles & 50–950 ramp

primary

#3F37D9

secondary

#D5D993

accent

#EB3DE2

background

#F9F6FE

surface

#F2ECFD

border

#CCC7D5

text

#0E0816

muted

#7E7B84

Preview Lab

Preview with #3F37D9

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

Preview Lab → · Contrast checker → · Palette generator →