#3F71BD#3F71BD

#3F71BD is a mid, vivid blue. Relative luminance 0.165; OKLCH L 55.1% C 0.131 H 258.6°. Best body text is #FFFFFF at 4.87:1 contrast (WCAG AA passes).

Color values

HEX	#3F71BD
RGB	rgb(63, 113, 189)
HSL	hsl(216, 50%, 49%)
HSV	hsv(216, 67%, 74%)
CMYK	cmyk(66.7%, 40.2%, 0%, 25.9%)
CIE-LAB	lab(47.67, 8.01, -44.95)
CIE-LCH	lch(47.67, 45.66, 280.10°)
OKLab	oklab(55.12% -0.0259 -0.128)
OKLCH	oklch(55.12% 0.131 258.6)
XYZ	xyz(17.1370, 16.5394, 50.4235)
Luminance	0.1654 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F71BD #BD8B3F

analogous

#3FB0BD #3F71BD #4C3FBD

triadic

#3F71BD #BD3F71 #71BD3F

tetradic

#3F71BD #BD3FB0 #BD8B3F #3FBD4C

square

#3F71BD #BD3FB0 #BD8B3F #3FBD4C

split-complementary

#3F71BD #BD4C3F #B0BD3F

monochromatic

#203A61 #30568F #3F71BD #6B92CE #99B4DD

Accessibility & contrast

On white

4.87

#3F71BD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.31

#3F71BD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F71BD

4.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F71BD	#FFFFFF	#000000	##FFFFFF
##3F71BD	1.00	4.87	4.31	4.87
#FFFFFF	4.87	1.00	21.00	1.00
#000000	4.31	21.00	1.00	21.00
##FFFFFF	4.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E77C0

Deuteranopia (green-blind)

#3B6CBB

Tritanopia (blue-blind)

#00828E

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #3f71bd;
/* rgb */ color: rgb(63, 113, 189);
/* oklch */ color: oklch(55.1% 0.131 258.6);

Tailwind

colors: {
  custom: {
    50: '#8199d1',
    500: '#3f71bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f71bd;
$custom-light: #8199d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f71bd",
  "rgb": {
    "r": 63,
    "g": 113,
    "b": 189
  },
  "hsl": {
    "h": 216.19,
    "s": 50,
    "l": 49.412
  },
  "oklch": {
    "l": 0.55118,
    "c": 0.13064,
    "h": 258.6
  },
  "luminance": 0.16541
}

Semantic roles & 50–950 ramp

primary

#3F71BD

secondary

#C9B28F

accent

#A24EDA

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #3F71BD

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

Preview Lab → · Contrast checker → · Palette generator →