#3F63B3#3F63B3

#3F63B3 is a mid, vivid blue. Relative luminance 0.132; OKLCH L 51.4% C 0.133 H 264.1°. Best body text is #FFFFFF at 5.76:1 contrast (WCAG AA passes).

Color values

HEX	#3F63B3
RGB	rgb(63, 99, 179)
HSL	hsl(221, 48%, 47%)
HSV	hsv(221, 65%, 70%)
CMYK	cmyk(64.8%, 44.7%, 0%, 29.8%)
CIE-LAB	lab(43.11, 13.26, -46.41)
CIE-LCH	lch(43.11, 48.27, 285.94°)
OKLab	oklab(51.41% -0.0138 -0.1325)
OKLCH	oklch(51.41% 0.133 264.1)
XYZ	xyz(14.6456, 13.2338, 44.4216)
Luminance	0.1323 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F63B3 #B38F3F

analogous

#3F9DB3 #3F63B3 #553FB3

triadic

#3F63B3 #B33F63 #63B33F

tetradic

#3F63B3 #B33F9D #B38F3F #3FB355

square

#3F63B3 #B33F9D #B38F3F #3FB355

split-complementary

#3F63B3 #B3553F #9DB33F

monochromatic

#1F3158 #2F4A86 #3F63B3 #6685C9 #93A9D9

Accessibility & contrast

On white

5.76

#3F63B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.65

#3F63B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F63B3

5.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F63B3	#FFFFFF	#000000	##FFFFFF
##3F63B3	1.00	5.76	3.65	5.76
#FFFFFF	5.76	1.00	21.00	1.00
#000000	3.65	21.00	1.00	21.00
##FFFFFF	5.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3D6CB6

Deuteranopia (green-blind)

#2A61B1

Tritanopia (blue-blind)

#007582

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3f63b3;
/* rgb */ color: rgb(63, 99, 179);
/* oklch */ color: oklch(51.4% 0.133 264.1);

Tailwind

colors: {
  custom: {
    50: '#808eca',
    500: '#3f63b3',
    950: '#000000',
  },
}

SCSS

$custom: #3f63b3;
$custom-light: #808eca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f63b3",
  "rgb": {
    "r": 63,
    "g": 99,
    "b": 179
  },
  "hsl": {
    "h": 221.379,
    "s": 47.934,
    "l": 47.451
  },
  "oklch": {
    "l": 0.51408,
    "c": 0.13326,
    "h": 264.1
  },
  "luminance": 0.13235
}

Semantic roles & 50–950 ramp

primary

#3F63B3

secondary

#C4B289

accent

#AE50D8

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3F63B3

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

Preview Lab → · Contrast checker → · Palette generator →