#3F73BC#3F73BC

#3F73BC is a mid, vivid blue. Relative luminance 0.169; OKLCH L 55.5% C 0.127 H 257.2°. Best body text is #FFFFFF at 4.78:1 contrast (WCAG AA passes).

Color values

HEX	#3F73BC
RGB	rgb(63, 115, 188)
HSL	hsl(215, 50%, 49%)
HSV	hsv(215, 66%, 74%)
CMYK	cmyk(66.5%, 38.8%, 0%, 26.3%)
CIE-LAB	lab(48.19, 6.41, -43.55)
CIE-LCH	lch(48.19, 44.02, 278.38°)
OKLab	oklab(55.5% -0.0281 -0.1239)
OKLCH	oklch(55.5% 0.127 257.2)
XYZ	xyz(17.2545, 16.9474, 49.9290)
Luminance	0.1695 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73BC #BC883F

analogous

#3FB2BC #3F73BC #4A3FBC

triadic

#3F73BC #BC3F73 #73BC3F

tetradic

#3F73BC #BC3FB2 #BC883F #3FBC4A

square

#3F73BC #BC3FB2 #BC883F #3FBC4A

split-complementary

#3F73BC #BC4A3F #B2BC3F

monochromatic

#203B60 #30578E #3F73BC #6B94CD #99B5DD

Accessibility & contrast

On white

4.78

#3F73BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.39

#3F73BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73BC

4.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73BC	#FFFFFF	#000000	##FFFFFF
##3F73BC	1.00	4.78	4.39	4.78
#FFFFFF	4.78	1.00	21.00	1.00
#000000	4.39	21.00	1.00	21.00
##FFFFFF	4.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5279BF

Deuteranopia (green-blind)

#406DBB

Tritanopia (blue-blind)

#00848E

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3f73bc;
/* rgb */ color: rgb(63, 115, 188);
/* oklch */ color: oklch(55.5% 0.127 257.2);

Tailwind

colors: {
  custom: {
    50: '#819ad0',
    500: '#3f73bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f73bc;
$custom-light: #819ad0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73bc",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 188
  },
  "hsl": {
    "h": 215.04,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.55504,
    "c": 0.12706,
    "h": 257.2
  },
  "luminance": 0.16949
}

Semantic roles & 50–950 ramp

primary

#3F73BC

secondary

#C9B08E

accent

#A04ED9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F73BC

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

Preview Lab → · Contrast checker → · Palette generator →