#3F72BC#3F72BC

#3F72BC is a mid, vivid blue. Relative luminance 0.167; OKLCH L 55.3% C 0.128 H 257.8°. Best body text is #FFFFFF at 4.83:1 contrast (WCAG AA passes).

Color values

HEX	#3F72BC
RGB	rgb(63, 114, 188)
HSL	hsl(216, 50%, 49%)
HSV	hsv(216, 66%, 74%)
CMYK	cmyk(66.5%, 39.4%, 0%, 26.3%)
CIE-LAB	lab(47.91, 7.03, -44.01)
CIE-LCH	lch(47.91, 44.56, 279.08°)
OKLab	oklab(55.28% -0.0271 -0.1253)
OKLCH	oklch(55.28% 0.128 257.8)
XYZ	xyz(17.1410, 16.7205, 49.8912)
Luminance	0.1672 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F72BC #BC893F

analogous

#3FB1BC #3F72BC #4B3FBC

triadic

#3F72BC #BC3F72 #72BC3F

tetradic

#3F72BC #BC3FB1 #BC893F #3FBC4B

square

#3F72BC #BC3FB1 #BC893F #3FBC4B

split-complementary

#3F72BC #BC4B3F #B1BC3F

monochromatic

#203A60 #30568E #3F72BC #6B93CD #99B4DD

Accessibility & contrast

On white

4.83

#3F72BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.34

#3F72BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F72BC

4.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F72BC	#FFFFFF	#000000	##FFFFFF
##3F72BC	1.00	4.83	4.34	4.83
#FFFFFF	4.83	1.00	21.00	1.00
#000000	4.34	21.00	1.00	21.00
##FFFFFF	4.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5178BF

Deuteranopia (green-blind)

#3E6CBA

Tritanopia (blue-blind)

#00838E

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3f72bc;
/* rgb */ color: rgb(63, 114, 188);
/* oklch */ color: oklch(55.3% 0.128 257.8);

Tailwind

colors: {
  custom: {
    50: '#819ad0',
    500: '#3f72bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f72bc;
$custom-light: #819ad0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f72bc",
  "rgb": {
    "r": 63,
    "g": 114,
    "b": 188
  },
  "hsl": {
    "h": 215.52,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.5528,
    "c": 0.12816,
    "h": 257.8
  },
  "luminance": 0.16722
}

Semantic roles & 50–950 ramp

primary

#3F72BC

secondary

#C9B18E

accent

#A14ED9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F72BC

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

Preview Lab → · Contrast checker → · Palette generator →