#3F63B1#3F63B1

#3F63B1 is a mid, vivid blue. Relative luminance 0.132; OKLCH L 51.3% C 0.130 H 263.8°. Best body text is #FFFFFF at 5.78:1 contrast (WCAG AA passes).

Color values

HEX	#3F63B1
RGB	rgb(63, 99, 177)
HSL	hsl(221, 48%, 47%)
HSV	hsv(221, 64%, 69%)
CMYK	cmyk(64.4%, 44.1%, 0%, 30.6%)
CIE-LAB	lab(42.99, 12.54, -45.43)
CIE-LCH	lch(42.99, 47.13, 285.43°)
OKLab	oklab(51.28% -0.0141 -0.1297)
OKLCH	oklch(51.28% 0.13 263.8)
XYZ	xyz(14.4448, 13.1534, 43.3641)
Luminance	0.1316 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F63B1 #B18D3F

analogous

#3F9CB1 #3F63B1 #543FB1

triadic

#3F63B1 #B13F63 #63B13F

tetradic

#3F63B1 #B13F9C #B18D3F #3FB154

square

#3F63B1 #B13F9C #B18D3F #3FB154

split-complementary

#3F63B1 #B1543F #9CB13F

monochromatic

#1F3157 #2F4A84 #3F63B1 #6584C8 #92A8D8

Accessibility & contrast

On white

5.78

#3F63B1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.63

#3F63B1 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F63B1

5.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F63B1	#FFFFFF	#000000	##FFFFFF
##3F63B1	1.00	5.78	3.63	5.78
#FFFFFF	5.78	1.00	21.00	1.00
#000000	3.63	21.00	1.00	21.00
##FFFFFF	5.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3E6BB4

Deuteranopia (green-blind)

#2C61AF

Tritanopia (blue-blind)

#007581

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3f63b1;
/* rgb */ color: rgb(63, 99, 177);
/* oklch */ color: oklch(51.3% 0.130 263.8);

Tailwind

colors: {
  custom: {
    50: '#7f8ec9',
    500: '#3f63b1',
    950: '#000000',
  },
}

SCSS

$custom: #3f63b1;
$custom-light: #7f8ec9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f63b1",
  "rgb": {
    "r": 63,
    "g": 99,
    "b": 177
  },
  "hsl": {
    "h": 221.053,
    "s": 47.5,
    "l": 47.059
  },
  "oklch": {
    "l": 0.51277,
    "c": 0.13043,
    "h": 263.8
  },
  "luminance": 0.13155
}

Semantic roles & 50–950 ramp

primary

#3F63B1

secondary

#C4B188

accent

#AD51D7

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3F63B1

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

Preview Lab → · Contrast checker → · Palette generator →