#3F66D0#3F66D0

#3F66D0 is a mid, vivid blue. Relative luminance 0.151; OKLCH L 54.0% C 0.170 H 265.8°. Best body text is #FFFFFF at 5.22:1 contrast (WCAG AA passes).

Color values

HEX	#3F66D0
RGB	rgb(63, 102, 208)
HSL	hsl(224, 61%, 53%)
HSV	hsv(224, 70%, 82%)
CMYK	cmyk(69.7%, 51%, 0%, 18.4%)
CIE-LAB	lab(45.79, 21.78, -58.90)
CIE-LCH	lch(45.79, 62.80, 290.29°)
OKLab	oklab(54.04% -0.0126 -0.1692)
OKLCH	oklch(54.04% 0.17 265.8)
XYZ	xyz(18.1825, 15.1117, 61.6209)
Luminance	0.1511 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66D0 #D0A93F

analogous

#3FAED0 #3F66D0 #603FD0

triadic

#3F66D0 #D03F66 #66D03F

tetradic

#3F66D0 #D03FAE #D0A93F #3FD060

square

#3F66D0 #D03FAE #D0A93F #3FD060

split-complementary

#3F66D0 #D0603F #AED03F

monochromatic

#1D3577 #294BA9 #3F66D0 #708DDC #A1B4E8

Accessibility & contrast

On white

5.22

#3F66D0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.02

#3F66D0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66D0

5.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66D0	#FFFFFF	#000000	##FFFFFF
##3F66D0	1.00	5.22	4.02	5.22
#FFFFFF	5.22	1.00	21.00	1.00
#000000	4.02	21.00	1.00	21.00
##FFFFFF	5.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2573D4

Deuteranopia (green-blind)

#0066CE

Tritanopia (blue-blind)

#007F91

Achromatopsia (no color)

#6C6C6C

Design tokens & code

CSS

--color: #3f66d0;
/* rgb */ color: rgb(63, 102, 208);
/* oklch */ color: oklch(54.0% 0.170 265.8);

Tailwind

colors: {
  custom: {
    50: '#8591df',
    500: '#3f66d0',
    950: '#000000',
  },
}

SCSS

$custom: #3f66d0;
$custom-light: #8591df;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66d0",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 208
  },
  "hsl": {
    "h": 223.862,
    "s": 60.669,
    "l": 53.137
  },
  "oklch": {
    "l": 0.54044,
    "c": 0.1697,
    "h": 265.8
  },
  "luminance": 0.15114
}

Semantic roles & 50–950 ramp

primary

#3F66D0

secondary

#D5C496

accent

#B944E4

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3F66D0

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

Preview Lab → · Contrast checker → · Palette generator →