#3F64BB#3F64BB

#3F64BB is a mid, vivid blue. Relative luminance 0.138; OKLCH L 52.2% C 0.143 H 264.6°. Best body text is #FFFFFF at 5.60:1 contrast (WCAG AA passes).

Color values

HEX	#3F64BB
RGB	rgb(63, 100, 187)
HSL	hsl(222, 50%, 49%)
HSV	hsv(222, 66%, 73%)
CMYK	cmyk(66.3%, 46.5%, 0%, 26.7%)
CIE-LAB	lab(43.88, 15.49, -49.85)
CIE-LCH	lch(43.88, 52.20, 287.26°)
OKLab	oklab(52.16% -0.0135 -0.1426)
OKLCH	oklch(52.16% 0.143 264.6)
XYZ	xyz(15.5736, 13.7575, 48.8388)
Luminance	0.1376 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F64BB #BB963F

analogous

#3FA2BB #3F64BB #583FBB

triadic

#3F64BB #BB3F64 #64BB3F

tetradic

#3F64BB #BB3FA2 #BB963F #3FBB58

square

#3F64BB #BB3FA2 #BB963F #3FBB58

split-complementary

#3F64BB #BB583F #A2BB3F

monochromatic

#20335F #304C8D #3F64BB #6A88CD #98ACDC

Accessibility & contrast

On white

5.60

#3F64BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.75

#3F64BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F64BB

5.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F64BB	#FFFFFF	#000000	##FFFFFF
##3F64BB	1.00	5.60	3.75	5.60
#FFFFFF	5.60	1.00	21.00	1.00
#000000	3.75	21.00	1.00	21.00
##FFFFFF	5.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#386EBE

Deuteranopia (green-blind)

#2062B9

Tritanopia (blue-blind)

#007886

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3f64bb;
/* rgb */ color: rgb(63, 100, 187);
/* oklch */ color: oklch(52.2% 0.143 264.6);

Tailwind

colors: {
  custom: {
    50: '#818fd0',
    500: '#3f64bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f64bb;
$custom-light: #818fd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f64bb",
  "rgb": {
    "r": 63,
    "g": 100,
    "b": 187
  },
  "hsl": {
    "h": 222.097,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.52157,
    "c": 0.14326,
    "h": 264.6
  },
  "luminance": 0.13759
}

Semantic roles & 50–950 ramp

primary

#3F64BB

secondary

#C8B78E

accent

#B04FD9

background

#F8F8FC

surface

#F0F0F9

border

#CBCBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3F64BB

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

Preview Lab → · Contrast checker → · Palette generator →