#3F73BF#3F73BF

#3F73BF is a mid, vivid blue. Relative luminance 0.171; OKLCH L 55.7% C 0.131 H 257.9°. Best body text is #FFFFFF at 4.76:1 contrast (WCAG AA passes).

Color values

HEX	#3F73BF
RGB	rgb(63, 115, 191)
HSL	hsl(216, 50%, 50%)
HSV	hsv(216, 67%, 75%)
CMYK	cmyk(67%, 39.8%, 0%, 25.1%)
CIE-LAB	lab(48.36, 7.48, -45.02)
CIE-LCH	lch(48.36, 45.63, 279.44°)
OKLab	oklab(55.68% -0.0274 -0.1282)
OKLCH	oklch(55.68% 0.131 257.9)
XYZ	xyz(17.5812, 17.0781, 51.6500)
Luminance	0.1708 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73BF #BF8B3F

analogous

#3FB3BF #3F73BF #4B3FBF

triadic

#3F73BF #BF3F73 #73BF3F

tetradic

#3F73BF #BF3FB3 #BF8B3F #3FBF4B

square

#3F73BF #BF3FB3 #BF8B3F #3FBF4B

split-complementary

#3F73BF #BF4B3F #B3BF3F

monochromatic

#213C63 #305791 #3F73BF #6D94CF #9BB6DE

Accessibility & contrast

On white

4.76

#3F73BF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.42

#3F73BF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73BF

4.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73BF	#FFFFFF	#000000	##FFFFFF
##3F73BF	1.00	4.76	4.42	4.76
#FFFFFF	4.76	1.00	21.00	1.00
#000000	4.42	21.00	1.00	21.00
##FFFFFF	4.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5179C2

Deuteranopia (green-blind)

#3D6DBD

Tritanopia (blue-blind)

#008490

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3f73bf;
/* rgb */ color: rgb(63, 115, 191);
/* oklch */ color: oklch(55.7% 0.131 257.9);

Tailwind

colors: {
  custom: {
    50: '#819ad3',
    500: '#3f73bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f73bf;
$custom-light: #819ad3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73bf",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 191
  },
  "hsl": {
    "h": 215.625,
    "s": 50.394,
    "l": 49.804
  },
  "oklch": {
    "l": 0.55685,
    "c": 0.13111,
    "h": 257.9
  },
  "luminance": 0.1708
}

Semantic roles & 50–950 ramp

primary

#3F73BF

secondary

#CAB290

accent

#A14EDA

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0B0E14

muted

#7C7E83

Preview Lab

Preview with #3F73BF

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

Preview Lab → · Contrast checker → · Palette generator →