#3F73BE#3F73BE

#3F73BE is a mid, vivid blue. Relative luminance 0.170; OKLCH L 55.6% C 0.130 H 257.7°. Best body text is #FFFFFF at 4.76:1 contrast (WCAG AA passes).

Color values

HEX	#3F73BE
RGB	rgb(63, 115, 190)
HSL	hsl(215, 50%, 50%)
HSV	hsv(215, 67%, 75%)
CMYK	cmyk(66.8%, 39.5%, 0%, 25.5%)
CIE-LAB	lab(48.30, 7.13, -44.53)
CIE-LCH	lch(48.30, 45.09, 279.09°)
OKLab	oklab(55.62% -0.0277 -0.1268)
OKLCH	oklch(55.62% 0.13 257.7)
XYZ	xyz(17.4715, 17.0342, 51.0724)
Luminance	0.1704 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73BE #BE8A3F

analogous

#3FB3BE #3F73BE #4A3FBE

triadic

#3F73BE #BE3F73 #73BE3F

tetradic

#3F73BE #BE3FB3 #BE8A3F #3FBE4A

square

#3F73BE #BE3FB3 #BE8A3F #3FBE4A

split-complementary

#3F73BE #BE4A3F #B3BE3F

monochromatic

#213B62 #305790 #3F73BE #6C94CE #9AB6DD

Accessibility & contrast

On white

4.76

#3F73BE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.41

#3F73BE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73BE

4.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73BE	#FFFFFF	#000000	##FFFFFF
##3F73BE	1.00	4.76	4.41	4.76
#FFFFFF	4.76	1.00	21.00	1.00
#000000	4.41	21.00	1.00	21.00
##FFFFFF	4.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5179C1

Deuteranopia (green-blind)

#3E6DBC

Tritanopia (blue-blind)

#00848F

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3f73be;
/* rgb */ color: rgb(63, 115, 190);
/* oklch */ color: oklch(55.6% 0.130 257.7);

Tailwind

colors: {
  custom: {
    50: '#819ad2',
    500: '#3f73be',
    950: '#000000',
  },
}

SCSS

$custom: #3f73be;
$custom-light: #819ad2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73be",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 190
  },
  "hsl": {
    "h": 215.433,
    "s": 50.198,
    "l": 49.608
  },
  "oklch": {
    "l": 0.55624,
    "c": 0.12976,
    "h": 257.7
  },
  "luminance": 0.17036
}

Semantic roles & 50–950 ramp

primary

#3F73BE

secondary

#C9B28F

accent

#A14EDA

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F73BE

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

Preview Lab → · Contrast checker → · Palette generator →