#3F66C8#3F66C8

#3F66C8 is a mid, vivid blue. Relative luminance 0.147; OKLCH L 53.5% C 0.159 H 265.1°. Best body text is #FFFFFF at 5.32:1 contrast (WCAG AA passes).

Color values

HEX	#3F66C8
RGB	rgb(63, 102, 200)
HSL	hsl(223, 55%, 52%)
HSV	hsv(223, 69%, 78%)
CMYK	cmyk(68.5%, 49%, 0%, 21.6%)
CIE-LAB	lab(45.26, 18.89, -55.16)
CIE-LCH	lch(45.26, 58.31, 288.90°)
OKLab	oklab(53.47% -0.0135 -0.1582)
OKLCH	oklch(53.47% 0.159 265.1)
XYZ	xyz(17.2229, 14.7279, 56.5675)
Luminance	0.1473 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66C8 #C8A13F

analogous

#3FABC8 #3F66C8 #5D3FC8

triadic

#3F66C8 #C83F66 #66C83F

tetradic

#3F66C8 #C83FAB #C8A13F #3FC85D

square

#3F66C8 #C83FAB #C8A13F #3FC85D

split-complementary

#3F66C8 #C85D3F #ABC83F

monochromatic

#1F366D #2D4D9D #3F66C8 #6F8CD6 #9EB2E3

Accessibility & contrast

On white

5.32

#3F66C8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.95

#3F66C8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66C8

5.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66C8	#FFFFFF	#000000	##FFFFFF
##3F66C8	1.00	5.32	3.95	5.32
#FFFFFF	5.32	1.00	21.00	1.00
#000000	3.95	21.00	1.00	21.00
##FFFFFF	5.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3072CC

Deuteranopia (green-blind)

#0365C6

Tritanopia (blue-blind)

#007D8D

Achromatopsia (no color)

#6B6B6B

Design tokens & code

CSS

--color: #3f66c8;
/* rgb */ color: rgb(63, 102, 200);
/* oklch */ color: oklch(53.5% 0.159 265.1);

Tailwind

colors: {
  custom: {
    50: '#8391d9',
    500: '#3f66c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f66c8;
$custom-light: #8391d9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66c8",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 200
  },
  "hsl": {
    "h": 222.92,
    "s": 55.466,
    "l": 51.569
  },
  "oklch": {
    "l": 0.53474,
    "c": 0.15879,
    "h": 265.1
  },
  "luminance": 0.1473
}

Semantic roles & 50–950 ramp

primary

#3F66C8

secondary

#D0BE93

accent

#B449DF

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3F66C8

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

Preview Lab → · Contrast checker → · Palette generator →