#3F66CE#3F66CE

#3F66CE is a mid, vivid blue. Relative luminance 0.150; OKLCH L 53.9% C 0.167 H 265.6°. Best body text is #FFFFFF at 5.25:1 contrast (WCAG AA passes).

Color values

HEX	#3F66CE
RGB	rgb(63, 102, 206)
HSL	hsl(224, 59%, 53%)
HSV	hsv(224, 69%, 81%)
CMYK	cmyk(69.4%, 50.5%, 0%, 19.2%)
CIE-LAB	lab(45.65, 21.06, -57.97)
CIE-LCH	lch(45.65, 61.68, 289.96°)
OKLab	oklab(53.9% -0.0128 -0.1665)
OKLCH	oklch(53.9% 0.167 265.6)
XYZ	xyz(17.9380, 15.0139, 60.3332)
Luminance	0.1502 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66CE #CEA73F

analogous

#3FAECE #3F66CE #5F3FCE

triadic

#3F66CE #CE3F66 #66CE3F

tetradic

#3F66CE #CE3FAE #CEA73F #3FCE5F

square

#3F66CE #CE3FAE #CEA73F #3FCE5F

split-complementary

#3F66CE #CE5F3F #AECE3F

monochromatic

#1E3675 #2A4CA6 #3F66CE #708DDA #A1B4E7

Accessibility & contrast

On white

5.25

#3F66CE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.00

#3F66CE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66CE

5.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66CE	#FFFFFF	#000000	##FFFFFF
##3F66CE	1.00	5.25	4.00	5.25
#FFFFFF	5.25	1.00	21.00	1.00
#000000	4.00	21.00	1.00	21.00
##FFFFFF	5.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2873D2

Deuteranopia (green-blind)

#0066CC

Tritanopia (blue-blind)

#007F90

Achromatopsia (no color)

#6C6C6C

Design tokens & code

CSS

--color: #3f66ce;
/* rgb */ color: rgb(63, 102, 206);
/* oklch */ color: oklch(53.9% 0.167 265.6);

Tailwind

colors: {
  custom: {
    50: '#8591de',
    500: '#3f66ce',
    950: '#000000',
  },
}

SCSS

$custom: #3f66ce;
$custom-light: #8591de;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66ce",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 206
  },
  "hsl": {
    "h": 223.636,
    "s": 59.336,
    "l": 52.745
  },
  "oklch": {
    "l": 0.539,
    "c": 0.16698,
    "h": 265.6
  },
  "luminance": 0.15016
}

Semantic roles & 50–950 ramp

primary

#3F66CE

secondary

#D3C295

accent

#B845E3

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3F66CE

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

Preview Lab → · Contrast checker → · Palette generator →