#3F73D9#3F73D9

#3F73D9 is a mid, vivid blue. Relative luminance 0.183; OKLCH L 57.4% C 0.166 H 262.2°. Best body text is #000000 at 4.67:1 contrast (WCAG AA passes).

Color values

HEX	#3F73D9
RGB	rgb(63, 115, 217)
HSL	hsl(220, 67%, 55%)
HSV	hsv(220, 71%, 85%)
CMYK	cmyk(71%, 47%, 0%, 14.9%)
CIE-LAB	lab(49.89, 16.82, -57.42)
CIE-LCH	lch(49.89, 59.83, 286.33°)
OKLab	oklab(57.36% -0.0226 -0.1646)
OKLCH	oklch(57.36% 0.166 262.2)
XYZ	xyz(20.7006, 18.3258, 68.0785)
Luminance	0.1833 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73D9 #D9A53F

analogous

#3FC0D9 #3F73D9 #583FD9

triadic

#3F73D9 #D93F73 #73D93F

tetradic

#3F73D9 #D93FC0 #D9A53F #3FD958

square

#3F73D9 #D93FC0 #D9A53F #3FD958

split-complementary

#3F73D9 #D9583F #C0D93F

monochromatic

#1A3E84 #2456B7 #3F73D9 #7298E3 #A5BEED

Accessibility & contrast

On white

4.50

#3F73D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.67

#3F73D9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F73D9

4.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73D9	#FFFFFF	#000000	##000000
##3F73D9	1.00	4.50	4.67	4.67
#FFFFFF	4.50	1.00	21.00	21.00
#000000	4.67	21.00	1.00	1.00
##000000	4.67	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3C7EDD

Deuteranopia (green-blind)

#1570D7

Tritanopia (blue-blind)

#008B9B

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #3f73d9;
/* rgb */ color: rgb(63, 115, 217);
/* oklch */ color: oklch(57.4% 0.166 262.2);

Tailwind

colors: {
  custom: {
    50: '#869ae5',
    500: '#3f73d9',
    950: '#000000',
  },
}

SCSS

$custom: #3f73d9;
$custom-light: #869ae5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73d9",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 217
  },
  "hsl": {
    "h": 219.74,
    "s": 66.957,
    "l": 54.902
  },
  "oklch": {
    "l": 0.57361,
    "c": 0.16619,
    "h": 262.2
  },
  "luminance": 0.18328
}

Semantic roles & 50–950 ramp

primary

#3F73D9

secondary

#DAC49A

accent

#B03EEA

background

#F8F9FE

surface

#F0F2FC

border

#CBCCD5

text

#0D0E16

muted

#7D7E84

Preview Lab

Preview with #3F73D9

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

Preview Lab → · Contrast checker → · Palette generator →