#3F73D0#3F73D0

#3F73D0 is a mid, vivid blue. Relative luminance 0.179; OKLCH L 56.8% C 0.154 H 261.0°. Best body text is #FFFFFF at 4.59:1 contrast (WCAG AA passes).

Color values

HEX	#3F73D0
RGB	rgb(63, 115, 208)
HSL	hsl(218, 61%, 53%)
HSV	hsv(218, 70%, 82%)
CMYK	cmyk(69.7%, 44.7%, 0%, 18.4%)
CIE-LAB	lab(49.34, 13.58, -53.19)
CIE-LCH	lch(49.34, 54.90, 284.32°)
OKLab	oklab(56.76% -0.024 -0.1522)
OKLCH	oklch(56.76% 0.154 261)
XYZ	xyz(19.5617, 17.8703, 62.0807)
Luminance	0.1787 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73D0 #D09C3F

analogous

#3FBBD0 #3F73D0 #543FD0

triadic

#3F73D0 #D03F73 #73D03F

tetradic

#3F73D0 #D03FBB #D09C3F #3FD054

square

#3F73D0 #D03FBB #D09C3F #3FD054

split-complementary

#3F73D0 #D0543F #BBD03F

monochromatic

#1D3E77 #2957A9 #3F73D0 #7097DC #A1BBE8

Accessibility & contrast

On white

4.59

#3F73D0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.57

#3F73D0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73D0

4.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73D0	#FFFFFF	#000000	##FFFFFF
##3F73D0	1.00	4.59	4.57	4.59
#FFFFFF	4.59	1.00	21.00	1.00
#000000	4.57	21.00	1.00	21.00
##FFFFFF	4.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#457CD4

Deuteranopia (green-blind)

#296FCE

Tritanopia (blue-blind)

#008997

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f73d0;
/* rgb */ color: rgb(63, 115, 208);
/* oklch */ color: oklch(56.8% 0.154 261.0);

Tailwind

colors: {
  custom: {
    50: '#859adf',
    500: '#3f73d0',
    950: '#000000',
  },
}

SCSS

$custom: #3f73d0;
$custom-light: #859adf;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73d0",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 208
  },
  "hsl": {
    "h": 218.483,
    "s": 60.669,
    "l": 53.137
  },
  "oklch": {
    "l": 0.56761,
    "c": 0.1541,
    "h": 261
  },
  "luminance": 0.17872
}

Semantic roles & 50–950 ramp

primary

#3F73D0

secondary

#D5BE96

accent

#AA44E4

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F73D0

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

Preview Lab → · Contrast checker → · Palette generator →