#3F37D0#3F37D0

#3F37D0 is a mid, highly saturated blue. Relative luminance 0.083; OKLCH L 45.9% C 0.224 H 275.3°. Best body text is #FFFFFF at 7.87:1 contrast (WCAG AA passes).

Color values

HEX	#3F37D0
RGB	rgb(63, 55, 208)
HSL	hsl(243, 62%, 52%)
HSV	hsv(243, 74%, 82%)
CMYK	cmyk(69.7%, 73.6%, 0%, 18.4%)
CIE-LAB	lab(34.68, 50.51, -77.03)
CIE-LCH	lch(34.68, 92.11, 303.25°)
OKLab	oklab(45.86% 0.0206 -0.2227)
OKLCH	oklch(45.86% 0.224 275.3)
XYZ	xyz(14.7975, 8.3418, 60.4926)
Luminance	0.0834 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blurple

#5539CC

ΔE00 2.62

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F37D0 #C8D037

analogous

#377CD0 #3F37D0 #8C37D0

triadic

#3F37D0 #D03F37 #37D03F

tetradic

#3F37D0 #D0377C #C8D037 #37D08C

square

#3F37D0 #D0377C #C8D037 #37D08C

split-complementary

#3F37D0 #D08C37 #7CD037

monochromatic

#1F1B72 #2D26A3 #3F37D0 #6F69DC #9E9AE7

Accessibility & contrast

On white

7.87

#3F37D0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.67

#3F37D0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37D0

7.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37D0	#FFFFFF	#000000	##FFFFFF
##3F37D0	1.00	7.87	2.67	7.87
#FFFFFF	7.87	1.00	21.00	1.00
#000000	2.67	21.00	1.00	21.00
##FFFFFF	7.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058D4

Deuteranopia (green-blind)

#004BCD

Tritanopia (blue-blind)

#006381

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f37d0;
/* rgb */ color: rgb(63, 55, 208);
/* oklch */ color: oklch(45.9% 0.224 275.3);

Tailwind

colors: {
  custom: {
    50: '#8870e0',
    500: '#3f37d0',
    950: '#000000',
  },
}

SCSS

$custom: #3f37d0;
$custom-light: #8870e0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37d0",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 208
  },
  "hsl": {
    "h": 243.137,
    "s": 61.943,
    "l": 51.569
  },
  "oklch": {
    "l": 0.45864,
    "c": 0.22365,
    "h": 275.3
  },
  "luminance": 0.08343
}

Semantic roles & 50–950 ramp

primary

#3F37D0

secondary

#D0D390

accent

#E543DD

background

#F9F6FD

surface

#F1ECFB

border

#CBC7D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F37D0

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

Preview Lab → · Contrast checker → · Palette generator →