#3F71B8#3F71B8

#3F71B8 is a mid, vivid blue. Relative luminance 0.163; OKLCH L 54.8% C 0.124 H 257.4°. Best body text is #FFFFFF at 4.92:1 contrast (WCAG AA passes).

Color values

HEX	#3F71B8
RGB	rgb(63, 113, 184)
HSL	hsl(215, 49%, 48%)
HSV	hsv(215, 66%, 72%)
CMYK	cmyk(65.8%, 38.6%, 0%, 27.8%)
CIE-LAB	lab(47.40, 6.23, -42.50)
CIE-LCH	lch(47.40, 42.95, 278.34°)
OKLab	oklab(54.82% -0.027 -0.1208)
OKLCH	oklch(54.82% 0.124 257.4)
XYZ	xyz(16.6036, 16.3261, 47.6143)
Luminance	0.1633 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F71B8 #B8863F

analogous

#3FADB8 #3F71B8 #4A3FB8

triadic

#3F71B8 #B83F71 #71B83F

tetradic

#3F71B8 #B83FAD #B8863F #3FB84A

square

#3F71B8 #B83FAD #B8863F #3FB84A

split-complementary

#3F71B8 #B84A3F #ADB83F

monochromatic

#20395D #2F558A #3F71B8 #6992CC #96B3DB

Accessibility & contrast

On white

4.92

#3F71B8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.27

#3F71B8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F71B8

4.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F71B8	#FFFFFF	#000000	##FFFFFF
##3F71B8	1.00	4.92	4.27	4.92
#FFFFFF	4.92	1.00	21.00	1.00
#000000	4.27	21.00	1.00	21.00
##FFFFFF	4.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5177BB

Deuteranopia (green-blind)

#406BB7

Tritanopia (blue-blind)

#00818B

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #3f71b8;
/* rgb */ color: rgb(63, 113, 184);
/* oklch */ color: oklch(54.8% 0.124 257.4);

Tailwind

colors: {
  custom: {
    50: '#8099ce',
    500: '#3f71b8',
    950: '#000000',
  },
}

SCSS

$custom: #3f71b8;
$custom-light: #8099ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3f71b8",
  "rgb": {
    "r": 63,
    "g": 113,
    "b": 184
  },
  "hsl": {
    "h": 215.207,
    "s": 48.988,
    "l": 48.431
  },
  "oklch": {
    "l": 0.54815,
    "c": 0.12383,
    "h": 257.4
  },
  "luminance": 0.16328
}

Semantic roles & 50–950 ramp

primary

#3F71B8

secondary

#C7AE8C

accent

#A04FD9

background

#F8F9FC

surface

#EFF2F9

border

#CACCD2

text

#0B0D13

muted

#7C7E82

Preview Lab

Preview with #3F71B8

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

Preview Lab → · Contrast checker → · Palette generator →