#3F73D8#3F73D8

#3F73D8 is a mid, vivid blue. Relative luminance 0.183; OKLCH L 57.3% C 0.165 H 262.1°. Best body text is #000000 at 4.66:1 contrast (WCAG AA passes).

Color values

HEX	#3F73D8
RGB	rgb(63, 115, 216)
HSL	hsl(220, 66%, 55%)
HSV	hsv(220, 71%, 85%)
CMYK	cmyk(70.8%, 46.8%, 0%, 15.3%)
CIE-LAB	lab(49.83, 16.46, -56.95)
CIE-LCH	lch(49.83, 59.28, 286.12°)
OKLab	oklab(57.29% -0.0227 -0.1633)
OKLCH	oklch(57.29% 0.165 262.1)
XYZ	xyz(20.5709, 18.2739, 67.3955)
Luminance	0.1828 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73D8 #D8A43F

analogous

#3FBFD8 #3F73D8 #583FD8

triadic

#3F73D8 #D83F73 #73D83F

tetradic

#3F73D8 #D83FBF #D8A43F #3FD858

square

#3F73D8 #D83FBF #D8A43F #3FD858

split-complementary

#3F73D8 #D8583F #BFD83F

monochromatic

#1A3E82 #2556B5 #3F73D8 #7298E2 #A5BDED

Accessibility & contrast

On white

4.51

#3F73D8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.66

#3F73D8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F73D8

4.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73D8	#FFFFFF	#000000	##000000
##3F73D8	1.00	4.51	4.66	4.66
#FFFFFF	4.51	1.00	21.00	21.00
#000000	4.66	21.00	1.00	1.00
##000000	4.66	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3D7EDC

Deuteranopia (green-blind)

#1870D6

Tritanopia (blue-blind)

#008B9B

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #3f73d8;
/* rgb */ color: rgb(63, 115, 216);
/* oklch */ color: oklch(57.3% 0.165 262.1);

Tailwind

colors: {
  custom: {
    50: '#869ae5',
    500: '#3f73d8',
    950: '#000000',
  },
}

SCSS

$custom: #3f73d8;
$custom-light: #869ae5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73d8",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 216
  },
  "hsl": {
    "h": 219.608,
    "s": 66.234,
    "l": 54.706
  },
  "oklch": {
    "l": 0.57293,
    "c": 0.16486,
    "h": 262.1
  },
  "luminance": 0.18276
}

Semantic roles & 50–950 ramp

primary

#3F73D8

secondary

#DAC499

accent

#AF3FE9

background

#F8F9FE

surface

#F0F2FC

border

#CBCCD5

text

#0D0E16

muted

#7D7E84

Preview Lab

Preview with #3F73D8

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

Preview Lab → · Contrast checker → · Palette generator →