#3F37CD#3F37CD

#3F37CD is a mid, highly saturated blue. Relative luminance 0.082; OKLCH L 45.6% C 0.220 H 275.5°. Best body text is #FFFFFF at 7.96:1 contrast (WCAG AA passes).

Color values

HEX	#3F37CD
RGB	rgb(63, 55, 205)
HSL	hsl(243, 60%, 51%)
HSV	hsv(243, 73%, 80%)
CMYK	cmyk(69.3%, 73.2%, 0%, 19.6%)
CIE-LAB	lab(34.39, 49.56, -75.78)
CIE-LCH	lch(34.39, 90.55, 303.19°)
OKLab	oklab(45.56% 0.0212 -0.2191)
OKLCH	oklch(45.56% 0.22 275.5)
XYZ	xyz(14.4319, 8.1956, 58.5671)
Luminance	0.0820 (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

#3F37CD #C5CD37

analogous

#377ACD #3F37CD #8A37CD

triadic

#3F37CD #CD3F37 #37CD3F

tetradic

#3F37CD #CD377A #C5CD37 #37CD8A

square

#3F37CD #CD377A #C5CD37 #37CD8A

split-complementary

#3F37CD #CD8A37 #7ACD37

monochromatic

#201C6E #2E289F #3F37CD #6E68D9 #9D99E5

Accessibility & contrast

On white

7.96

#3F37CD on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.64

#3F37CD on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37CD

7.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37CD	#FFFFFF	#000000	##FFFFFF
##3F37CD	1.00	7.96	2.64	7.96
#FFFFFF	7.96	1.00	21.00	1.00
#000000	2.64	21.00	1.00	21.00
##FFFFFF	7.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057D1

Deuteranopia (green-blind)

#004ACA

Tritanopia (blue-blind)

#00627F

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #3f37cd;
/* rgb */ color: rgb(63, 55, 205);
/* oklch */ color: oklch(45.6% 0.220 275.5);

Tailwind

colors: {
  custom: {
    50: '#8870de',
    500: '#3f37cd',
    950: '#000000',
  },
}

SCSS

$custom: #3f37cd;
$custom-light: #8870de;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37cd",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 205
  },
  "hsl": {
    "h": 243.2,
    "s": 60,
    "l": 50.98
  },
  "oklch": {
    "l": 0.45564,
    "c": 0.22008,
    "h": 275.5
  },
  "luminance": 0.08197
}

Semantic roles & 50–950 ramp

primary

#3F37CD

secondary

#CED18F

accent

#E345DB

background

#F9F6FD

surface

#F1ECFB

border

#CBC7D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F37CD

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

Preview Lab → · Contrast checker → · Palette generator →