#3F72BB#3F72BB

#3F72BB is a mid, vivid blue. Relative luminance 0.167; OKLCH L 55.2% C 0.127 H 257.5°. Best body text is #FFFFFF at 4.84:1 contrast (WCAG AA passes).

Color values

HEX	#3F72BB
RGB	rgb(63, 114, 187)
HSL	hsl(215, 50%, 49%)
HSV	hsv(215, 66%, 73%)
CMYK	cmyk(66.3%, 39%, 0%, 26.7%)
CIE-LAB	lab(47.85, 6.68, -43.52)
CIE-LCH	lch(47.85, 44.02, 278.72°)
OKLab	oklab(55.22% -0.0273 -0.1238)
OKLCH	oklch(55.22% 0.127 257.5)
XYZ	xyz(17.0336, 16.6776, 49.3255)
Luminance	0.1668 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F72BB #BB883F

analogous

#3FB0BB #3F72BB #4A3FBB

triadic

#3F72BB #BB3F72 #72BB3F

tetradic

#3F72BB #BB3FB0 #BB883F #3FBB4A

square

#3F72BB #BB3FB0 #BB883F #3FBB4A

split-complementary

#3F72BB #BB4A3F #B0BB3F

monochromatic

#203A5F #30568D #3F72BB #6A93CD #98B4DC

Accessibility & contrast

On white

4.84

#3F72BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.34

#3F72BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F72BB

4.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F72BB	#FFFFFF	#000000	##FFFFFF
##3F72BB	1.00	4.84	4.34	4.84
#FFFFFF	4.84	1.00	21.00	1.00
#000000	4.34	21.00	1.00	21.00
##FFFFFF	4.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5178BE

Deuteranopia (green-blind)

#3F6CBA

Tritanopia (blue-blind)

#00838D

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3f72bb;
/* rgb */ color: rgb(63, 114, 187);
/* oklch */ color: oklch(55.2% 0.127 257.5);

Tailwind

colors: {
  custom: {
    50: '#819ad0',
    500: '#3f72bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f72bb;
$custom-light: #819ad0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f72bb",
  "rgb": {
    "r": 63,
    "g": 114,
    "b": 187
  },
  "hsl": {
    "h": 215.323,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.5522,
    "c": 0.1268,
    "h": 257.5
  },
  "luminance": 0.16679
}

Semantic roles & 50–950 ramp

primary

#3F72BB

secondary

#C8B08E

accent

#A04FD9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F72BB

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

Preview Lab → · Contrast checker → · Palette generator →