#3F66CD#3F66CD

#3F66CD is a mid, vivid blue. Relative luminance 0.150; OKLCH L 53.8% C 0.166 H 265.5°. Best body text is #FFFFFF at 5.26:1 contrast (WCAG AA passes).

Color values

HEX	#3F66CD
RGB	rgb(63, 102, 205)
HSL	hsl(224, 59%, 53%)
HSV	hsv(224, 69%, 80%)
CMYK	cmyk(69.3%, 50.2%, 0%, 19.6%)
CIE-LAB	lab(45.59, 20.69, -57.51)
CIE-LCH	lch(45.59, 61.12, 289.79°)
OKLab	oklab(53.83% -0.0129 -0.1651)
OKLCH	oklch(53.83% 0.166 265.5)
XYZ	xyz(17.8169, 14.9655, 59.6954)
Luminance	0.1497 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66CD #CDA63F

analogous

#3FADCD #3F66CD #5F3FCD

triadic

#3F66CD #CD3F66 #66CD3F

tetradic

#3F66CD #CD3FAD #CDA63F #3FCD5F

square

#3F66CD #CD3FAD #CDA63F #3FCD5F

split-complementary

#3F66CD #CD5F3F #ADCD3F

monochromatic

#1E3674 #2B4CA4 #3F66CD #708DDA #A0B3E6

Accessibility & contrast

On white

5.26

#3F66CD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.99

#3F66CD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66CD

5.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66CD	#FFFFFF	#000000	##FFFFFF
##3F66CD	1.00	5.26	3.99	5.26
#FFFFFF	5.26	1.00	21.00	1.00
#000000	3.99	21.00	1.00	21.00
##FFFFFF	5.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2973D1

Deuteranopia (green-blind)

#0066CB

Tritanopia (blue-blind)

#007E90

Achromatopsia (no color)

#6C6C6C

Design tokens & code

CSS

--color: #3f66cd;
/* rgb */ color: rgb(63, 102, 205);
/* oklch */ color: oklch(53.8% 0.166 265.5);

Tailwind

colors: {
  custom: {
    50: '#8491dd',
    500: '#3f66cd',
    950: '#000000',
  },
}

SCSS

$custom: #3f66cd;
$custom-light: #8491dd;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66cd",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 205
  },
  "hsl": {
    "h": 223.521,
    "s": 58.678,
    "l": 52.549
  },
  "oklch": {
    "l": 0.53828,
    "c": 0.16562,
    "h": 265.5
  },
  "luminance": 0.14967
}

Semantic roles & 50–950 ramp

primary

#3F66CD

secondary

#D3C295

accent

#B746E2

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3F66CD

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

Preview Lab → · Contrast checker → · Palette generator →