#3F71BE#3F71BE

#3F71BE is a mid, vivid blue. Relative luminance 0.166; OKLCH L 55.2% C 0.132 H 258.8°. Best body text is #FFFFFF at 4.86:1 contrast (WCAG AA passes).

Color values

HEX	#3F71BE
RGB	rgb(63, 113, 190)
HSL	hsl(216, 50%, 50%)
HSV	hsv(216, 67%, 75%)
CMYK	cmyk(66.8%, 40.5%, 0%, 25.5%)
CIE-LAB	lab(47.73, 8.37, -45.44)
CIE-LCH	lch(47.73, 46.20, 280.43°)
OKLab	oklab(55.18% -0.0257 -0.1295)
OKLCH	oklch(55.18% 0.132 258.8)
XYZ	xyz(17.2460, 16.5830, 50.9972)
Luminance	0.1658 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F71BE #BE8C3F

analogous

#3FB1BE #3F71BE #4C3FBE

triadic

#3F71BE #BE3F71 #71BE3F

tetradic

#3F71BE #BE3FB1 #BE8C3F #3FBE4C

square

#3F71BE #BE3FB1 #BE8C3F #3FBE4C

split-complementary

#3F71BE #BE4C3F #B1BE3F

monochromatic

#213A62 #305690 #3F71BE #6C93CE #9AB5DD

Accessibility & contrast

On white

4.86

#3F71BE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.32

#3F71BE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F71BE

4.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F71BE	#FFFFFF	#000000	##FFFFFF
##3F71BE	1.00	4.86	4.32	4.86
#FFFFFF	4.86	1.00	21.00	1.00
#000000	4.32	21.00	1.00	21.00
##FFFFFF	4.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E78C1

Deuteranopia (green-blind)

#3A6CBC

Tritanopia (blue-blind)

#00838E

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #3f71be;
/* rgb */ color: rgb(63, 113, 190);
/* oklch */ color: oklch(55.2% 0.132 258.8);

Tailwind

colors: {
  custom: {
    50: '#8199d2',
    500: '#3f71be',
    950: '#000000',
  },
}

SCSS

$custom: #3f71be;
$custom-light: #8199d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f71be",
  "rgb": {
    "r": 63,
    "g": 113,
    "b": 190
  },
  "hsl": {
    "h": 216.378,
    "s": 50.198,
    "l": 49.608
  },
  "oklch": {
    "l": 0.5518,
    "c": 0.132,
    "h": 258.8
  },
  "luminance": 0.16585
}

Semantic roles & 50–950 ramp

primary

#3F71BE

secondary

#C9B38F

accent

#A34EDA

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #3F71BE

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

Preview Lab → · Contrast checker → · Palette generator →