#3F63CB#3F63CB

#3F63CB is a mid, vivid blue. Relative luminance 0.143; OKLCH L 53.1% C 0.167 H 266.4°. Best body text is #FFFFFF at 5.44:1 contrast (WCAG AA passes).

Color values

HEX	#3F63CB
RGB	rgb(63, 99, 203)
HSL	hsl(225, 57%, 52%)
HSV	hsv(225, 69%, 80%)
CMYK	cmyk(69%, 51.2%, 0%, 20.4%)
CIE-LAB	lab(44.65, 21.88, -57.87)
CIE-LCH	lch(44.65, 61.87, 290.71°)
OKLab	oklab(53.07% -0.0105 -0.1662)
OKLCH	oklch(53.07% 0.167 266.4)
XYZ	xyz(17.2875, 14.2905, 58.3356)
Luminance	0.1429 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F63CB #CBA73F

analogous

#3FA9CB #3F63CB #613FCB

triadic

#3F63CB #CB3F63 #63CB3F

tetradic

#3F63CB #CB3FA9 #CBA73F #3FCB61

square

#3F63CB #CB3FA9 #CBA73F #3FCB61

split-complementary

#3F63CB #CB613F #A9CB3F

monochromatic

#1F3471 #2C4AA1 #3F63CB #6F8AD8 #9FB1E5

Accessibility & contrast

On white

5.44

#3F63CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.86

#3F63CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F63CB

5.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F63CB	#FFFFFF	#000000	##FFFFFF
##3F63CB	1.00	5.44	3.86	5.44
#FFFFFF	5.44	1.00	21.00	1.00
#000000	3.86	21.00	1.00	21.00
##FFFFFF	5.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2370CF

Deuteranopia (green-blind)

#0064C9

Tritanopia (blue-blind)

#007C8D

Achromatopsia (no color)

#6A6A6A

Design tokens & code

CSS

--color: #3f63cb;
/* rgb */ color: rgb(63, 99, 203);
/* oklch */ color: oklch(53.1% 0.167 266.4);

Tailwind

colors: {
  custom: {
    50: '#848edb',
    500: '#3f63cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f63cb;
$custom-light: #848edb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f63cb",
  "rgb": {
    "r": 63,
    "g": 99,
    "b": 203
  },
  "hsl": {
    "h": 224.571,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.53071,
    "c": 0.16658,
    "h": 266.4
  },
  "luminance": 0.14292
}

Semantic roles & 50–950 ramp

primary

#3F63CB

secondary

#D1C294

accent

#B947E1

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3F63CB

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

Preview Lab → · Contrast checker → · Palette generator →