#3F73CB#3F73CB

#3F73CB is a mid, vivid blue. Relative luminance 0.176; OKLCH L 56.4% C 0.147 H 260.2°. Best body text is #FFFFFF at 4.64:1 contrast (WCAG AA passes).

Color values

HEX	#3F73CB
RGB	rgb(63, 115, 203)
HSL	hsl(218, 57%, 52%)
HSV	hsv(218, 69%, 80%)
CMYK	cmyk(69%, 43.3%, 0%, 20.4%)
CIE-LAB	lab(49.04, 11.78, -50.81)
CIE-LCH	lch(49.04, 52.16, 283.05°)
OKLab	oklab(56.44% -0.025 -0.1452)
OKLCH	oklch(56.44% 0.147 260.2)
XYZ	xyz(18.9563, 17.6281, 58.8919)
Luminance	0.1763 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73CB #CB973F

analogous

#3FB9CB #3F73CB #513FCB

triadic

#3F73CB #CB3F73 #73CB3F

tetradic

#3F73CB #CB3FB9 #CB973F #3FCB51

square

#3F73CB #CB3FB9 #CB973F #3FCB51

split-complementary

#3F73CB #CB513F #B9CB3F

monochromatic

#1F3D71 #2C57A1 #3F73CB #6F96D8 #9FB9E5

Accessibility & contrast

On white

4.64

#3F73CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.53

#3F73CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73CB

4.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73CB	#FFFFFF	#000000	##FFFFFF
##3F73CB	1.00	4.64	4.53	4.64
#FFFFFF	4.64	1.00	21.00	1.00
#000000	4.53	21.00	1.00	21.00
##FFFFFF	4.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#487BCE

Deuteranopia (green-blind)

#306FC9

Tritanopia (blue-blind)

#008795

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f73cb;
/* rgb */ color: rgb(63, 115, 203);
/* oklch */ color: oklch(56.4% 0.147 260.2);

Tailwind

colors: {
  custom: {
    50: '#849adb',
    500: '#3f73cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f73cb;
$custom-light: #849adb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73cb",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 203
  },
  "hsl": {
    "h": 217.714,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.56436,
    "c": 0.14735,
    "h": 260.2
  },
  "luminance": 0.1763
}

Semantic roles & 50–950 ramp

primary

#3F73CB

secondary

#D1BB94

accent

#A847E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F73CB

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

Preview Lab → · Contrast checker → · Palette generator →