#3F73C5#3F73C5

#3F73C5 is a mid, vivid blue. Relative luminance 0.173; OKLCH L 56.1% C 0.139 H 259.2°. Best body text is #FFFFFF at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#3F73C5
RGB	rgb(63, 115, 197)
HSL	hsl(217, 54%, 51%)
HSV	hsv(217, 68%, 77%)
CMYK	cmyk(68%, 41.6%, 0%, 22.7%)
CIE-LAB	lab(48.70, 9.62, -47.93)
CIE-LCH	lch(48.70, 48.89, 281.35°)
OKLab	oklab(56.06% -0.0261 -0.1368)
OKLCH	oklch(56.06% 0.139 259.2)
XYZ	xyz(18.2551, 17.3476, 55.1989)
Luminance	0.1735 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73C5 #C5913F

analogous

#3FB6C5 #3F73C5 #4E3FC5

triadic

#3F73C5 #C53F73 #73C53F

tetradic

#3F73C5 #C53FB6 #C5913F #3FC54E

square

#3F73C5 #C53FB6 #C5913F #3FC54E

split-complementary

#3F73C5 #C54E3F #B6C53F

monochromatic

#203D6A #2E5799 #3F73C5 #6E95D3 #9DB8E1

Accessibility & contrast

On white

4.70

#3F73C5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.47

#3F73C5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73C5

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73C5	#FFFFFF	#000000	##FFFFFF
##3F73C5	1.00	4.70	4.47	4.70
#FFFFFF	4.70	1.00	21.00	1.00
#000000	4.47	21.00	1.00	21.00
##FFFFFF	4.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4D7AC8

Deuteranopia (green-blind)

#376EC3

Tritanopia (blue-blind)

#008692

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3f73c5;
/* rgb */ color: rgb(63, 115, 197);
/* oklch */ color: oklch(56.1% 0.139 259.2);

Tailwind

colors: {
  custom: {
    50: '#839ad7',
    500: '#3f73c5',
    950: '#000000',
  },
}

SCSS

$custom: #3f73c5;
$custom-light: #839ad7;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73c5",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 197
  },
  "hsl": {
    "h": 216.716,
    "s": 53.6,
    "l": 50.98
  },
  "oklch": {
    "l": 0.56056,
    "c": 0.13924,
    "h": 259.2
  },
  "luminance": 0.17349
}

Semantic roles & 50–950 ramp

primary

#3F73C5

secondary

#CEB792

accent

#A44BDD

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0E14

muted

#7D7E83

Preview Lab

Preview with #3F73C5

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

Preview Lab → · Contrast checker → · Palette generator →