#3F66DC#3F66DC

#3F66DC is a mid, vivid blue. Relative luminance 0.157; OKLCH L 54.9% C 0.186 H 266.4°. Best body text is #FFFFFF at 5.07:1 contrast (WCAG AA passes).

Color values

HEX	#3F66DC
RGB	rgb(63, 102, 220)
HSL	hsl(225, 69%, 55%)
HSV	hsv(225, 71%, 86%)
CMYK	cmyk(71.4%, 53.6%, 0%, 13.7%)
CIE-LAB	lab(46.61, 26.10, -64.41)
CIE-LCH	lch(46.61, 69.50, 292.06°)
OKLab	oklab(54.93% -0.0115 -0.1854)
OKLCH	oklch(54.93% 0.186 266.4)
XYZ	xyz(19.7150, 15.7247, 69.6924)
Luminance	0.1573 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66DC #DCB53F

analogous

#3FB4DC #3F66DC #673FDC

triadic

#3F66DC #DC3F66 #66DC3F

tetradic

#3F66DC #DC3FB4 #DCB53F #3FDC67

square

#3F66DC #DC3FB4 #DCB53F #3FDC67

split-complementary

#3F66DC #DC673F #B4DC3F

monochromatic

#193488 #2248BC #3F66DC #738FE5 #A7B8EF

Accessibility & contrast

On white

5.07

#3F66DC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.15

#3F66DC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66DC

5.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66DC	#FFFFFF	#000000	##FFFFFF
##3F66DC	1.00	5.07	4.15	5.07
#FFFFFF	5.07	1.00	21.00	1.00
#000000	4.15	21.00	1.00	21.00
##FFFFFF	5.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0376E0

Deuteranopia (green-blind)

#0068DA

Tritanopia (blue-blind)

#008397

Achromatopsia (no color)

#6E6E6E

Design tokens & code

CSS

--color: #3f66dc;
/* rgb */ color: rgb(63, 102, 220);
/* oklch */ color: oklch(54.9% 0.186 266.4);

Tailwind

colors: {
  custom: {
    50: '#8791e8',
    500: '#3f66dc',
    950: '#000000',
  },
}

SCSS

$custom: #3f66dc;
$custom-light: #8791e8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66dc",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 220
  },
  "hsl": {
    "h": 225.096,
    "s": 69.163,
    "l": 55.49
  },
  "oklch": {
    "l": 0.5493,
    "c": 0.1858,
    "h": 266.4
  },
  "luminance": 0.15727
}

Semantic roles & 50–950 ramp

primary

#3F66DC

secondary

#DCCC9B

accent

#C03CEC

background

#F9F8FE

surface

#F1F0FD

border

#CBCBD5

text

#0D0C16

muted

#7E7D84

Preview Lab

Preview with #3F66DC

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

Preview Lab → · Contrast checker → · Palette generator →