#3F71BB#3F71BB

#3F71BB is a mid, vivid blue. Relative luminance 0.165; OKLCH L 55.0% C 0.128 H 258.1°. Best body text is #FFFFFF at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#3F71BB
RGB	rgb(63, 113, 187)
HSL	hsl(216, 50%, 49%)
HSV	hsv(216, 66%, 73%)
CMYK	cmyk(66.3%, 39.6%, 0%, 26.7%)
CIE-LAB	lab(47.56, 7.30, -43.97)
CIE-LCH	lch(47.56, 44.57, 279.42°)
OKLab	oklab(55% -0.0263 -0.1252)
OKLCH	oklch(55% 0.128 258.1)
XYZ	xyz(16.9214, 16.4532, 49.2881)
Luminance	0.1646 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F71BB #BB893F

analogous

#3FAFBB #3F71BB #4B3FBB

triadic

#3F71BB #BB3F71 #71BB3F

tetradic

#3F71BB #BB3FAF #BB893F #3FBB4B

square

#3F71BB #BB3FAF #BB893F #3FBB4B

split-complementary

#3F71BB #BB4B3F #AFBB3F

monochromatic

#203A5F #30558D #3F71BB #6A92CD #98B4DC

Accessibility & contrast

On white

4.89

#3F71BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.29

#3F71BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F71BB

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F71BB	#FFFFFF	#000000	##FFFFFF
##3F71BB	1.00	4.89	4.29	4.89
#FFFFFF	4.89	1.00	21.00	1.00
#000000	4.29	21.00	1.00	21.00
##FFFFFF	4.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5077BE

Deuteranopia (green-blind)

#3D6CB9

Tritanopia (blue-blind)

#00828D

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #3f71bb;
/* rgb */ color: rgb(63, 113, 187);
/* oklch */ color: oklch(55.0% 0.128 258.1);

Tailwind

colors: {
  custom: {
    50: '#8199d0',
    500: '#3f71bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f71bb;
$custom-light: #8199d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f71bb",
  "rgb": {
    "r": 63,
    "g": 113,
    "b": 187
  },
  "hsl": {
    "h": 215.806,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.54996,
    "c": 0.12792,
    "h": 258.1
  },
  "luminance": 0.16455
}

Semantic roles & 50–950 ramp

primary

#3F71BB

secondary

#C8B18E

accent

#A14FD9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #3F71BB

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

Preview Lab → · Contrast checker → · Palette generator →