#3F73C7#3F73C7

#3F73C7 is a mid, vivid blue. Relative luminance 0.174; OKLCH L 56.2% C 0.142 H 259.6°. Best body text is #FFFFFF at 4.68:1 contrast (WCAG AA passes).

Color values

HEX	#3F73C7
RGB	rgb(63, 115, 199)
HSL	hsl(217, 55%, 51%)
HSV	hsv(217, 68%, 78%)
CMYK	cmyk(68.3%, 42.2%, 0%, 22%)
CIE-LAB	lab(48.81, 10.34, -48.89)
CIE-LCH	lch(48.81, 49.98, 281.94°)
OKLab	oklab(56.18% -0.0257 -0.1396)
OKLCH	oklch(56.18% 0.142 259.6)
XYZ	xyz(18.4857, 17.4399, 56.4138)
Luminance	0.1744 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73C7 #C7933F

analogous

#3FB7C7 #3F73C7 #4F3FC7

triadic

#3F73C7 #C73F73 #73C73F

tetradic

#3F73C7 #C73FB7 #C7933F #3FC74F

square

#3F73C7 #C73FB7 #C7933F #3FC74F

split-complementary

#3F73C7 #C74F3F #B7C73F

monochromatic

#203D6C #2D579B #3F73C7 #6E96D5 #9EB8E3

Accessibility & contrast

On white

4.68

#3F73C7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.49

#3F73C7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73C7

4.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73C7	#FFFFFF	#000000	##FFFFFF
##3F73C7	1.00	4.68	4.49	4.68
#FFFFFF	4.68	1.00	21.00	1.00
#000000	4.49	21.00	1.00	21.00
##FFFFFF	4.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4B7BCA

Deuteranopia (green-blind)

#356EC5

Tritanopia (blue-blind)

#008693

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3f73c7;
/* rgb */ color: rgb(63, 115, 199);
/* oklch */ color: oklch(56.2% 0.142 259.6);

Tailwind

colors: {
  custom: {
    50: '#839ad8',
    500: '#3f73c7',
    950: '#000000',
  },
}

SCSS

$custom: #3f73c7;
$custom-light: #839ad8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73c7",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 199
  },
  "hsl": {
    "h": 217.059,
    "s": 54.839,
    "l": 51.373
  },
  "oklch": {
    "l": 0.56181,
    "c": 0.14194,
    "h": 259.6
  },
  "luminance": 0.17442
}

Semantic roles & 50–950 ramp

primary

#3F73C7

secondary

#CFB893

accent

#A54ADE

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0E14

muted

#7D7E83

Preview Lab

Preview with #3F73C7

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

Preview Lab → · Contrast checker → · Palette generator →