#3F37DA#3F37DA

#3F37DA is a mid, highly saturated blue. Relative luminance 0.089; OKLCH L 46.9% C 0.235 H 274.5°. Best body text is #FFFFFF at 7.58:1 contrast (WCAG AA passes).

Color values

HEX	#3F37DA
RGB	rgb(63, 55, 218)
HSL	hsl(243, 69%, 54%)
HSV	hsv(243, 75%, 85%)
CMYK	cmyk(71.1%, 74.8%, 0%, 14.5%)
CIE-LAB	lab(35.69, 53.65, -81.14)
CIE-LCH	lch(35.69, 97.27, 303.47°)
OKLab	oklab(46.88% 0.0186 -0.2347)
OKLCH	oklch(46.88% 0.235 274.5)
XYZ	xyz(16.0668, 8.8495, 67.1775)
Luminance	0.0885 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blurple

#5539CC

ΔE00 2.81

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F37DA #D2DA37

analogous

#3780DA #3F37DA #9037DA

triadic

#3F37DA #DA3F37 #37DA3F

tetradic

#3F37DA #DA3780 #D2DA37 #37DA90

square

#3F37DA #DA3780 #D2DA37 #37DA90

split-complementary

#3F37DA #DA9037 #80DA37

monochromatic

#1D187F #2821B3 #3F37DA #716BE4 #A29EED

Accessibility & contrast

On white

7.58

#3F37DA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.77

#3F37DA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37DA

7.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37DA	#FFFFFF	#000000	##FFFFFF
##3F37DA	1.00	7.58	2.77	7.58
#FFFFFF	7.58	1.00	21.00	1.00
#000000	2.77	21.00	1.00	21.00
##FFFFFF	7.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BDF

Deuteranopia (green-blind)

#004CD7

Tritanopia (blue-blind)

#006786

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f37da;
/* rgb */ color: rgb(63, 55, 218);
/* oklch */ color: oklch(46.9% 0.235 274.5);

Tailwind

colors: {
  custom: {
    50: '#8b71e7',
    500: '#3f37da',
    950: '#000000',
  },
}

SCSS

$custom: #3f37da;
$custom-light: #8b71e7;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37da",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 218
  },
  "hsl": {
    "h": 242.945,
    "s": 68.776,
    "l": 53.529
  },
  "oklch": {
    "l": 0.46878,
    "c": 0.2354,
    "h": 274.5
  },
  "luminance": 0.08851
}

Semantic roles & 50–950 ramp

primary

#3F37DA

secondary

#D6D993

accent

#EC3CE3

background

#F9F6FE

surface

#F2ECFD

border

#CCC7D5

text

#0E0816

muted

#7E7B84

Preview Lab

Preview with #3F37DA

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

Preview Lab → · Contrast checker → · Palette generator →