#3F71DD#3F71DD

#3F71DD is a mid, vivid blue. Relative luminance 0.181; OKLCH L 57.2% C 0.174 H 263.3°. Best body text is #000000 at 4.62:1 contrast (WCAG AA passes).

Color values

HEX	#3F71DD
RGB	rgb(63, 113, 221)
HSL	hsl(221, 70%, 56%)
HSV	hsv(221, 71%, 87%)
CMYK	cmyk(71.5%, 48.9%, 0%, 13.3%)
CIE-LAB	lab(49.60, 19.52, -60.15)
CIE-LCH	lch(49.60, 63.24, 287.98°)
OKLab	oklab(57.22% -0.0203 -0.1727)
OKLCH	oklch(57.22% 0.174 263.3)
XYZ	xyz(21.0015, 18.0852, 70.7766)
Luminance	0.1809 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F71DD #DDAB3F

analogous

#3FC0DD #3F71DD #5C3FDD

triadic

#3F71DD #DD3F71 #71DD3F

tetradic

#3F71DD #DD3FC0 #DDAB3F #3FDD5C

square

#3F71DD #DD3FC0 #DDAB3F #3FDD5C

split-complementary

#3F71DD #DD5C3F #C0DD3F

monochromatic

#183C89 #2253BD #3F71DD #7397E6 #A7BEEF

Accessibility & contrast

On white

4.55

#3F71DD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.62

#3F71DD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F71DD

4.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F71DD	#FFFFFF	#000000	##000000
##3F71DD	1.00	4.55	4.62	4.62
#FFFFFF	4.55	1.00	21.00	21.00
#000000	4.62	21.00	1.00	1.00
##000000	4.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#337EE1

Deuteranopia (green-blind)

#006FDB

Tritanopia (blue-blind)

#008B9C

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #3f71dd;
/* rgb */ color: rgb(63, 113, 221);
/* oklch */ color: oklch(57.2% 0.174 263.3);

Tailwind

colors: {
  custom: {
    50: '#8799e8',
    500: '#3f71dd',
    950: '#000000',
  },
}

SCSS

$custom: #3f71dd;
$custom-light: #8799e8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f71dd",
  "rgb": {
    "r": 63,
    "g": 113,
    "b": 221
  },
  "hsl": {
    "h": 221.013,
    "s": 69.912,
    "l": 55.686
  },
  "oklch": {
    "l": 0.5722,
    "c": 0.1739,
    "h": 263.3
  },
  "luminance": 0.18087
}

Semantic roles & 50–950 ramp

primary

#3F71DD

secondary

#DDC89B

accent

#B53BED

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0D16

muted

#7E7E84

Preview Lab

Preview with #3F71DD

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

Preview Lab → · Contrast checker → · Palette generator →