#3F73BB#3F73BB

#3F73BB is a mid, vivid cyan. Relative luminance 0.169; OKLCH L 55.4% C 0.126 H 257.0°. Best body text is #FFFFFF at 4.79:1 contrast (WCAG AA passes).

Color values

HEX	#3F73BB
RGB	rgb(63, 115, 187)
HSL	hsl(215, 50%, 49%)
HSV	hsv(215, 66%, 73%)
CMYK	cmyk(66.3%, 38.5%, 0%, 26.7%)
CIE-LAB	lab(48.14, 6.06, -43.06)
CIE-LCH	lch(48.14, 43.48, 278.01°)
OKLab	oklab(55.44% -0.0283 -0.1225)
OKLCH	oklch(55.44% 0.126 257)
XYZ	xyz(17.1470, 16.9044, 49.3633)
Luminance	0.1691 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73BB #BB873F

analogous

#3FB1BB #3F73BB #493FBB

triadic

#3F73BB #BB3F73 #73BB3F

tetradic

#3F73BB #BB3FB1 #BB873F #3FBB49

square

#3F73BB #BB3FB1 #BB873F #3FBB49

split-complementary

#3F73BB #BB493F #B1BB3F

monochromatic

#203B5F #30578D #3F73BB #6A94CD #98B5DC

Accessibility & contrast

On white

4.79

#3F73BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.38

#3F73BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73BB

4.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73BB	#FFFFFF	#000000	##FFFFFF
##3F73BB	1.00	4.79	4.38	4.79
#FFFFFF	4.79	1.00	21.00	1.00
#000000	4.38	21.00	1.00	21.00
##FFFFFF	4.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5379BE

Deuteranopia (green-blind)

#416DBA

Tritanopia (blue-blind)

#00848E

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3f73bb;
/* rgb */ color: rgb(63, 115, 187);
/* oklch */ color: oklch(55.4% 0.126 257.0);

Tailwind

colors: {
  custom: {
    50: '#819ad0',
    500: '#3f73bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f73bb;
$custom-light: #819ad0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73bb",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 187
  },
  "hsl": {
    "h": 214.839,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.55444,
    "c": 0.12571,
    "h": 257
  },
  "luminance": 0.16906
}

Semantic roles & 50–950 ramp

primary

#3F73BB

secondary

#C8B08E

accent

#9F4FD9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F73BB

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

Preview Lab → · Contrast checker → · Palette generator →