#3F71CB#3F71CB

#3F71CB is a mid, vivid blue. Relative luminance 0.172; OKLCH L 56.0% C 0.150 H 261.1°. Best body text is #FFFFFF at 4.73:1 contrast (WCAG AA passes).

Color values

HEX	#3F71CB
RGB	rgb(63, 113, 203)
HSL	hsl(219, 57%, 52%)
HSV	hsv(219, 69%, 80%)
CMYK	cmyk(69%, 44.3%, 0%, 20.4%)
CIE-LAB	lab(48.48, 13.03, -51.71)
CIE-LCH	lch(48.48, 53.32, 284.14°)
OKLab	oklab(56% -0.0231 -0.1479)
OKLCH	oklch(56% 0.15 261.1)
XYZ	xyz(18.7307, 17.1769, 58.8167)
Luminance	0.1718 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F71CB #CB993F

analogous

#3FB7CB #3F71CB #533FCB

triadic

#3F71CB #CB3F71 #71CB3F

tetradic

#3F71CB #CB3FB7 #CB993F #3FCB53

square

#3F71CB #CB3FB7 #CB993F #3FCB53

split-complementary

#3F71CB #CB533F #B7CB3F

monochromatic

#1F3C71 #2C56A1 #3F71CB #6F95D8 #9FB8E5

Accessibility & contrast

On white

4.73

#3F71CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.44

#3F71CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F71CB

4.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F71CB	#FFFFFF	#000000	##FFFFFF
##3F71CB	1.00	4.73	4.44	4.73
#FFFFFF	4.73	1.00	21.00	1.00
#000000	4.44	21.00	1.00	21.00
##FFFFFF	4.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#457ACE

Deuteranopia (green-blind)

#2B6DC9

Tritanopia (blue-blind)

#008694

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3f71cb;
/* rgb */ color: rgb(63, 113, 203);
/* oklch */ color: oklch(56.0% 0.150 261.1);

Tailwind

colors: {
  custom: {
    50: '#8499db',
    500: '#3f71cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f71cb;
$custom-light: #8499db;
$custom-dark: #000000;

JSON

{
  "hex": "#3f71cb",
  "rgb": {
    "r": 63,
    "g": 113,
    "b": 203
  },
  "hsl": {
    "h": 218.571,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.56004,
    "c": 0.14968,
    "h": 261.1
  },
  "luminance": 0.17179
}

Semantic roles & 50–950 ramp

primary

#3F71CB

secondary

#D1BC94

accent

#AA47E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3F71CB

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

Preview Lab → · Contrast checker → · Palette generator →