#3F71BC#3F71BC

#3F71BC is a mid, vivid blue. Relative luminance 0.165; OKLCH L 55.1% C 0.129 H 258.4°. Best body text is #FFFFFF at 4.88:1 contrast (WCAG AA passes).

Color values

HEX	#3F71BC
RGB	rgb(63, 113, 188)
HSL	hsl(216, 50%, 49%)
HSV	hsv(216, 66%, 74%)
CMYK	cmyk(66.5%, 39.9%, 0%, 26.3%)
CIE-LAB	lab(47.62, 7.65, -44.46)
CIE-LCH	lch(47.62, 45.12, 279.77°)
OKLab	oklab(55.06% -0.0261 -0.1266)
OKLCH	oklch(55.06% 0.129 258.4)
XYZ	xyz(17.0289, 16.4962, 49.8539)
Luminance	0.1650 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F71BC #BC8A3F

analogous

#3FB0BC #3F71BC #4C3FBC

triadic

#3F71BC #BC3F71 #71BC3F

tetradic

#3F71BC #BC3FB0 #BC8A3F #3FBC4C

square

#3F71BC #BC3FB0 #BC8A3F #3FBC4C

split-complementary

#3F71BC #BC4C3F #B0BC3F

monochromatic

#203A60 #30558E #3F71BC #6B92CD #99B4DD

Accessibility & contrast

On white

4.88

#3F71BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.30

#3F71BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F71BC

4.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F71BC	#FFFFFF	#000000	##FFFFFF
##3F71BC	1.00	4.88	4.30	4.88
#FFFFFF	4.88	1.00	21.00	1.00
#000000	4.30	21.00	1.00	21.00
##FFFFFF	4.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F77BF

Deuteranopia (green-blind)

#3C6CBA

Tritanopia (blue-blind)

#00828D

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #3f71bc;
/* rgb */ color: rgb(63, 113, 188);
/* oklch */ color: oklch(55.1% 0.129 258.4);

Tailwind

colors: {
  custom: {
    50: '#8199d0',
    500: '#3f71bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f71bc;
$custom-light: #8199d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f71bc",
  "rgb": {
    "r": 63,
    "g": 113,
    "b": 188
  },
  "hsl": {
    "h": 216,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.55057,
    "c": 0.12927,
    "h": 258.4
  },
  "luminance": 0.16498
}

Semantic roles & 50–950 ramp

primary

#3F71BC

secondary

#C9B18E

accent

#A24ED9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #3F71BC

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

Preview Lab → · Contrast checker → · Palette generator →