#3F63BB#3F63BB

#3F63BB is a mid, vivid blue. Relative luminance 0.136; OKLCH L 51.9% C 0.144 H 265.0°. Best body text is #FFFFFF at 5.65:1 contrast (WCAG AA passes).

Color values

HEX	#3F63BB
RGB	rgb(63, 99, 187)
HSL	hsl(223, 50%, 49%)
HSV	hsv(223, 66%, 73%)
CMYK	cmyk(66.3%, 47.1%, 0%, 26.7%)
CIE-LAB	lab(43.61, 16.12, -50.30)
CIE-LCH	lch(43.61, 52.82, 287.78°)
OKLab	oklab(51.94% -0.0125 -0.1439)
OKLCH	oklch(51.94% 0.144 265)
XYZ	xyz(15.4783, 13.5668, 48.8070)
Luminance	0.1357 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F63BB #BB973F

analogous

#3FA1BB #3F63BB #593FBB

triadic

#3F63BB #BB3F63 #63BB3F

tetradic

#3F63BB #BB3FA1 #BB973F #3FBB59

square

#3F63BB #BB3FA1 #BB973F #3FBB59

split-complementary

#3F63BB #BB593F #A1BB3F

monochromatic

#20335F #304B8D #3F63BB #6A87CD #98ACDC

Accessibility & contrast

On white

5.65

#3F63BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.71

#3F63BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F63BB

5.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F63BB	#FFFFFF	#000000	##FFFFFF
##3F63BB	1.00	5.65	3.71	5.65
#FFFFFF	5.65	1.00	21.00	1.00
#000000	3.71	21.00	1.00	21.00
##FFFFFF	5.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#366DBE

Deuteranopia (green-blind)

#1D62B9

Tritanopia (blue-blind)

#007786

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #3f63bb;
/* rgb */ color: rgb(63, 99, 187);
/* oklch */ color: oklch(51.9% 0.144 265.0);

Tailwind

colors: {
  custom: {
    50: '#818ed0',
    500: '#3f63bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f63bb;
$custom-light: #818ed0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f63bb",
  "rgb": {
    "r": 63,
    "g": 99,
    "b": 187
  },
  "hsl": {
    "h": 222.581,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.51944,
    "c": 0.14449,
    "h": 265
  },
  "luminance": 0.13568
}

Semantic roles & 50–950 ramp

primary

#3F63BB

secondary

#C8B78E

accent

#B14FD9

background

#F8F8FC

surface

#F0F0F9

border

#CBCBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3F63BB

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

Preview Lab → · Contrast checker → · Palette generator →