#3F66CF#3F66CF

#3F66CF is a mid, vivid blue. Relative luminance 0.151; OKLCH L 54.0% C 0.168 H 265.7°. Best body text is #FFFFFF at 5.23:1 contrast (WCAG AA passes).

Color values

HEX	#3F66CF
RGB	rgb(63, 102, 207)
HSL	hsl(224, 60%, 53%)
HSV	hsv(224, 70%, 81%)
CMYK	cmyk(69.6%, 50.7%, 0%, 18.8%)
CIE-LAB	lab(45.72, 21.42, -58.44)
CIE-LCH	lch(45.72, 62.24, 290.13°)
OKLab	oklab(53.97% -0.0127 -0.1679)
OKLCH	oklch(53.97% 0.168 265.7)
XYZ	xyz(18.0598, 15.0627, 60.9750)
Luminance	0.1506 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66CF #CFA83F

analogous

#3FAECF #3F66CF #603FCF

triadic

#3F66CF #CF3F66 #66CF3F

tetradic

#3F66CF #CF3FAE #CFA83F #3FCF60

square

#3F66CF #CF3FAE #CFA83F #3FCF60

split-complementary

#3F66CF #CF603F #AECF3F

monochromatic

#1E3676 #2A4CA7 #3F66CF #708DDB #A1B4E7

Accessibility & contrast

On white

5.23

#3F66CF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.01

#3F66CF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66CF

5.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66CF	#FFFFFF	#000000	##FFFFFF
##3F66CF	1.00	5.23	4.01	5.23
#FFFFFF	5.23	1.00	21.00	1.00
#000000	4.01	21.00	1.00	21.00
##FFFFFF	5.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2673D3

Deuteranopia (green-blind)

#0066CD

Tritanopia (blue-blind)

#007F91

Achromatopsia (no color)

#6C6C6C

Design tokens & code

CSS

--color: #3f66cf;
/* rgb */ color: rgb(63, 102, 207);
/* oklch */ color: oklch(54.0% 0.168 265.7);

Tailwind

colors: {
  custom: {
    50: '#8591de',
    500: '#3f66cf',
    950: '#000000',
  },
}

SCSS

$custom: #3f66cf;
$custom-light: #8591de;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66cf",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 207
  },
  "hsl": {
    "h": 223.75,
    "s": 60,
    "l": 52.941
  },
  "oklch": {
    "l": 0.53971,
    "c": 0.16834,
    "h": 265.7
  },
  "luminance": 0.15064
}

Semantic roles & 50–950 ramp

primary

#3F66CF

secondary

#D4C396

accent

#B845E3

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3F66CF

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

Preview Lab → · Contrast checker → · Palette generator →