#3F37CC#3F37CC

#3F37CC is a mid, highly saturated blue. Relative luminance 0.081; OKLCH L 45.5% C 0.219 H 275.6°. Best body text is #FFFFFF at 7.99:1 contrast (WCAG AA passes).

Color values

HEX	#3F37CC
RGB	rgb(63, 55, 204)
HSL	hsl(243, 59%, 51%)
HSV	hsv(243, 73%, 80%)
CMYK	cmyk(69.1%, 73%, 0%, 20%)
CIE-LAB	lab(34.29, 49.24, -75.36)
CIE-LCH	lch(34.29, 90.02, 303.16°)
OKLab	oklab(45.46% 0.0214 -0.2178)
OKLCH	oklch(45.46% 0.219 275.6)
XYZ	xyz(14.3116, 8.1474, 57.9334)
Luminance	0.0815 (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

#3F37CC #C4CC37

analogous

#377ACC #3F37CC #8937CC

triadic

#3F37CC #CC3F37 #37CC3F

tetradic

#3F37CC #CC377A #C4CC37 #37CC89

square

#3F37CC #CC377A #C4CC37 #37CC89

split-complementary

#3F37CC #CC8937 #7ACC37

monochromatic

#201C6D #2E289E #3F37CC #6E68D8 #9D99E5

Accessibility & contrast

On white

7.99

#3F37CC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.63

#3F37CC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37CC

7.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37CC	#FFFFFF	#000000	##FFFFFF
##3F37CC	1.00	7.99	2.63	7.99
#FFFFFF	7.99	1.00	21.00	1.00
#000000	2.63	21.00	1.00	21.00
##FFFFFF	7.99	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057D0

Deuteranopia (green-blind)

#004AC9

Tritanopia (blue-blind)

#00617E

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #3f37cc;
/* rgb */ color: rgb(63, 55, 204);
/* oklch */ color: oklch(45.5% 0.219 275.6);

Tailwind

colors: {
  custom: {
    50: '#8870dd',
    500: '#3f37cc',
    950: '#000000',
  },
}

SCSS

$custom: #3f37cc;
$custom-light: #8870dd;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37cc",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 204
  },
  "hsl": {
    "h": 243.221,
    "s": 59.363,
    "l": 50.784
  },
  "oklch": {
    "l": 0.45464,
    "c": 0.21889,
    "h": 275.6
  },
  "luminance": 0.08149
}

Semantic roles & 50–950 ramp

primary

#3F37CC

secondary

#CDD08E

accent

#E345DA

background

#F9F6FD

surface

#F1ECFB

border

#CBC7D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F37CC

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

Preview Lab → · Contrast checker → · Palette generator →