#3F72CB#3F72CB

#3F72CB is a mid, vivid blue. Relative luminance 0.174; OKLCH L 56.2% C 0.149 H 260.7°. Best body text is #FFFFFF at 4.69:1 contrast (WCAG AA passes).

Color values

HEX	#3F72CB
RGB	rgb(63, 114, 203)
HSL	hsl(218, 57%, 52%)
HSV	hsv(218, 69%, 80%)
CMYK	cmyk(69%, 43.8%, 0%, 20.4%)
CIE-LAB	lab(48.76, 12.40, -51.26)
CIE-LCH	lch(48.76, 52.74, 283.60°)
OKLab	oklab(56.22% -0.024 -0.1466)
OKLCH	oklch(56.22% 0.149 260.7)
XYZ	xyz(18.8429, 17.4013, 58.8541)
Luminance	0.1740 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F72CB #CB983F

analogous

#3FB8CB #3F72CB #523FCB

triadic

#3F72CB #CB3F72 #72CB3F

tetradic

#3F72CB #CB3FB8 #CB983F #3FCB52

square

#3F72CB #CB3FB8 #CB983F #3FCB52

split-complementary

#3F72CB #CB523F #B8CB3F

monochromatic

#1F3D71 #2C56A1 #3F72CB #6F95D8 #9FB9E5

Accessibility & contrast

On white

4.69

#3F72CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.48

#3F72CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F72CB

4.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F72CB	#FFFFFF	#000000	##FFFFFF
##3F72CB	1.00	4.69	4.48	4.69
#FFFFFF	4.69	1.00	21.00	1.00
#000000	4.48	21.00	1.00	21.00
##FFFFFF	4.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#477BCE

Deuteranopia (green-blind)

#2E6EC9

Tritanopia (blue-blind)

#008794

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3f72cb;
/* rgb */ color: rgb(63, 114, 203);
/* oklch */ color: oklch(56.2% 0.149 260.7);

Tailwind

colors: {
  custom: {
    50: '#849adb',
    500: '#3f72cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f72cb;
$custom-light: #849adb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f72cb",
  "rgb": {
    "r": 63,
    "g": 114,
    "b": 203
  },
  "hsl": {
    "h": 218.143,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.5622,
    "c": 0.14852,
    "h": 260.7
  },
  "luminance": 0.17403
}

Semantic roles & 50–950 ramp

primary

#3F72CB

secondary

#D1BB94

accent

#A947E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3F72CB

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

Preview Lab → · Contrast checker → · Palette generator →