#3F73CC#3F73CC

#3F73CC is a mid, vivid blue. Relative luminance 0.177; OKLCH L 56.5% C 0.149 H 260.4°. Best body text is #FFFFFF at 4.63:1 contrast (WCAG AA passes).

Color values

HEX	#3F73CC
RGB	rgb(63, 115, 204)
HSL	hsl(218, 58%, 52%)
HSV	hsv(218, 69%, 80%)
CMYK	cmyk(69.1%, 43.6%, 0%, 20%)
CIE-LAB	lab(49.10, 12.14, -51.29)
CIE-LCH	lch(49.10, 52.71, 283.31°)
OKLab	oklab(56.5% -0.0248 -0.1466)
OKLCH	oklch(56.5% 0.149 260.4)
XYZ	xyz(19.0758, 17.6759, 59.5215)
Luminance	0.1768 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73CC #CC983F

analogous

#3FBACC #3F73CC #513FCC

triadic

#3F73CC #CC3F73 #73CC3F

tetradic

#3F73CC #CC3FBA #CC983F #3FCC51

square

#3F73CC #CC3FBA #CC983F #3FCC51

split-complementary

#3F73CC #CC513F #BACC3F

monochromatic

#1E3D72 #2B57A3 #3F73CC #6F96D9 #A0BAE6

Accessibility & contrast

On white

4.63

#3F73CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.54

#3F73CC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73CC

4.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73CC	#FFFFFF	#000000	##FFFFFF
##3F73CC	1.00	4.63	4.54	4.63
#FFFFFF	4.63	1.00	21.00	1.00
#000000	4.54	21.00	1.00	21.00
##FFFFFF	4.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#487CCF

Deuteranopia (green-blind)

#2F6FCA

Tritanopia (blue-blind)

#008895

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f73cc;
/* rgb */ color: rgb(63, 115, 204);
/* oklch */ color: oklch(56.5% 0.149 260.4);

Tailwind

colors: {
  custom: {
    50: '#849adc',
    500: '#3f73cc',
    950: '#000000',
  },
}

SCSS

$custom: #3f73cc;
$custom-light: #849adc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73cc",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 204
  },
  "hsl": {
    "h": 217.872,
    "s": 58.025,
    "l": 52.353
  },
  "oklch": {
    "l": 0.565,
    "c": 0.14871,
    "h": 260.4
  },
  "luminance": 0.17678
}

Semantic roles & 50–950 ramp

primary

#3F73CC

secondary

#D2BB95

accent

#A847E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F73CC

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

Preview Lab → · Contrast checker → · Palette generator →