#3F73C8#3F73C8

#3F73C8 is a mid, vivid blue. Relative luminance 0.175; OKLCH L 56.2% C 0.143 H 259.7°. Best body text is #FFFFFF at 4.67:1 contrast (WCAG AA passes).

Color values

HEX	#3F73C8
RGB	rgb(63, 115, 200)
HSL	hsl(217, 55%, 52%)
HSV	hsv(217, 69%, 78%)
CMYK	cmyk(68.5%, 42.5%, 0%, 21.6%)
CIE-LAB	lab(48.87, 10.70, -49.37)
CIE-LCH	lch(48.87, 50.52, 282.23°)
OKLab	oklab(56.25% -0.0255 -0.141)
OKLCH	oklch(56.25% 0.143 259.7)
XYZ	xyz(18.6022, 17.4865, 57.0272)
Luminance	0.1749 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73C8 #C8943F

analogous

#3FB8C8 #3F73C8 #503FC8

triadic

#3F73C8 #C83F73 #73C83F

tetradic

#3F73C8 #C83FB8 #C8943F #3FC850

square

#3F73C8 #C83FB8 #C8943F #3FC850

split-complementary

#3F73C8 #C8503F #B8C83F

monochromatic

#1F3D6D #2D579D #3F73C8 #6F96D6 #9EB8E3

Accessibility & contrast

On white

4.67

#3F73C8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.50

#3F73C8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73C8

4.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73C8	#FFFFFF	#000000	##FFFFFF
##3F73C8	1.00	4.67	4.50	4.67
#FFFFFF	4.67	1.00	21.00	1.00
#000000	4.50	21.00	1.00	21.00
##FFFFFF	4.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4B7BCB

Deuteranopia (green-blind)

#346EC6

Tritanopia (blue-blind)

#008794

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3f73c8;
/* rgb */ color: rgb(63, 115, 200);
/* oklch */ color: oklch(56.2% 0.143 259.7);

Tailwind

colors: {
  custom: {
    50: '#839ad9',
    500: '#3f73c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f73c8;
$custom-light: #839ad9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73c8",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 200
  },
  "hsl": {
    "h": 217.226,
    "s": 55.466,
    "l": 51.569
  },
  "oklch": {
    "l": 0.56245,
    "c": 0.14329,
    "h": 259.7
  },
  "luminance": 0.17488
}

Semantic roles & 50–950 ramp

primary

#3F73C8

secondary

#D0B993

accent

#A649DF

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F73C8

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

Preview Lab → · Contrast checker → · Palette generator →