#3F63BC#3F63BC

#3F63BC is a mid, vivid blue. Relative luminance 0.136; OKLCH L 52.0% C 0.146 H 265.1°. Best body text is #FFFFFF at 5.64:1 contrast (WCAG AA passes).

Color values

HEX	#3F63BC
RGB	rgb(63, 99, 188)
HSL	hsl(223, 50%, 49%)
HSV	hsv(223, 66%, 74%)
CMYK	cmyk(66.5%, 47.3%, 0%, 26.3%)
CIE-LAB	lab(43.67, 16.48, -50.78)
CIE-LCH	lch(43.67, 53.38, 287.98°)
OKLab	oklab(52.01% -0.0123 -0.1454)
OKLCH	oklch(52.01% 0.146 265.1)
XYZ	xyz(15.5857, 13.6098, 49.3728)
Luminance	0.1361 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F63BC #BC983F

analogous

#3FA2BC #3F63BC #5A3FBC

triadic

#3F63BC #BC3F63 #63BC3F

tetradic

#3F63BC #BC3FA2 #BC983F #3FBC5A

square

#3F63BC #BC3FA2 #BC983F #3FBC5A

split-complementary

#3F63BC #BC5A3F #A2BC3F

monochromatic

#203360 #304B8E #3F63BC #6B87CD #99ACDD

Accessibility & contrast

On white

5.64

#3F63BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.72

#3F63BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F63BC

5.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F63BC	#FFFFFF	#000000	##FFFFFF
##3F63BC	1.00	5.64	3.72	5.64
#FFFFFF	5.64	1.00	21.00	1.00
#000000	3.72	21.00	1.00	21.00
##FFFFFF	5.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#356DBF

Deuteranopia (green-blind)

#1B62BA

Tritanopia (blue-blind)

#007886

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #3f63bc;
/* rgb */ color: rgb(63, 99, 188);
/* oklch */ color: oklch(52.0% 0.146 265.1);

Tailwind

colors: {
  custom: {
    50: '#818ed1',
    500: '#3f63bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f63bc;
$custom-light: #818ed1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f63bc",
  "rgb": {
    "r": 63,
    "g": 99,
    "b": 188
  },
  "hsl": {
    "h": 222.72,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.52012,
    "c": 0.14589,
    "h": 265.1
  },
  "luminance": 0.13611
}

Semantic roles & 50–950 ramp

primary

#3F63BC

secondary

#C9B88E

accent

#B14ED9

background

#F8F8FC

surface

#F0F0F9

border

#CBCBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3F63BC

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

Preview Lab → · Contrast checker → · Palette generator →