#3F73BD#3F73BD

#3F73BD is a mid, vivid blue. Relative luminance 0.170; OKLCH L 55.6% C 0.128 H 257.5°. Best body text is #FFFFFF at 4.77:1 contrast (WCAG AA passes).

Color values

HEX	#3F73BD
RGB	rgb(63, 115, 189)
HSL	hsl(215, 50%, 49%)
HSV	hsv(215, 67%, 74%)
CMYK	cmyk(66.7%, 39.2%, 0%, 25.9%)
CIE-LAB	lab(48.25, 6.77, -44.04)
CIE-LCH	lch(48.25, 44.56, 278.74°)
OKLab	oklab(55.56% -0.0279 -0.1253)
OKLCH	oklch(55.56% 0.128 257.5)
XYZ	xyz(17.3626, 16.9906, 50.4987)
Luminance	0.1699 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73BD #BD893F

analogous

#3FB2BD #3F73BD #4A3FBD

triadic

#3F73BD #BD3F73 #73BD3F

tetradic

#3F73BD #BD3FB2 #BD893F #3FBD4A

square

#3F73BD #BD3FB2 #BD893F #3FBD4A

split-complementary

#3F73BD #BD4A3F #B2BD3F

monochromatic

#203B61 #30578F #3F73BD #6B94CE #99B5DD

Accessibility & contrast

On white

4.77

#3F73BD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.40

#3F73BD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73BD

4.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73BD	#FFFFFF	#000000	##FFFFFF
##3F73BD	1.00	4.77	4.40	4.77
#FFFFFF	4.77	1.00	21.00	1.00
#000000	4.40	21.00	1.00	21.00
##FFFFFF	4.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5279C0

Deuteranopia (green-blind)

#3F6DBB

Tritanopia (blue-blind)

#00848F

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3f73bd;
/* rgb */ color: rgb(63, 115, 189);
/* oklch */ color: oklch(55.6% 0.128 257.5);

Tailwind

colors: {
  custom: {
    50: '#819ad1',
    500: '#3f73bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f73bd;
$custom-light: #819ad1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73bd",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 189
  },
  "hsl": {
    "h": 215.238,
    "s": 50,
    "l": 49.412
  },
  "oklch": {
    "l": 0.55564,
    "c": 0.12841,
    "h": 257.5
  },
  "luminance": 0.16992
}

Semantic roles & 50–950 ramp

primary

#3F73BD

secondary

#C9B18F

accent

#A04EDA

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F73BD

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

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