#3F66D8#3F66D8

#3F66D8 is a mid, vivid blue. Relative luminance 0.155; OKLCH L 54.6% C 0.180 H 266.2°. Best body text is #FFFFFF at 5.12:1 contrast (WCAG AA passes).

Color values

HEX	#3F66D8
RGB	rgb(63, 102, 216)
HSL	hsl(225, 66%, 55%)
HSV	hsv(225, 71%, 85%)
CMYK	cmyk(70.8%, 52.8%, 0%, 15.3%)
CIE-LAB	lab(46.33, 24.66, -62.59)
CIE-LCH	lch(46.33, 67.27, 291.50°)
OKLab	oklab(54.63% -0.0118 -0.1801)
OKLCH	oklch(54.63% 0.18 266.2)
XYZ	xyz(19.1916, 15.5154, 66.9358)
Luminance	0.1552 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66D8 #D8B13F

analogous

#3FB3D8 #3F66D8 #653FD8

triadic

#3F66D8 #D83F66 #66D83F

tetradic

#3F66D8 #D83FB3 #D8B13F #3FD865

square

#3F66D8 #D83FB3 #D8B13F #3FD865

split-complementary

#3F66D8 #D8653F #B3D83F

monochromatic

#1A3582 #254AB5 #3F66D8 #728FE2 #A5B7ED

Accessibility & contrast

On white

5.12

#3F66D8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.10

#3F66D8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66D8

5.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66D8	#FFFFFF	#000000	##FFFFFF
##3F66D8	1.00	5.12	4.10	5.12
#FFFFFF	5.12	1.00	21.00	1.00
#000000	4.10	21.00	1.00	21.00
##FFFFFF	5.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1375DC

Deuteranopia (green-blind)

#0067D6

Tritanopia (blue-blind)

#008195

Achromatopsia (no color)

#6E6E6E

Design tokens & code

CSS

--color: #3f66d8;
/* rgb */ color: rgb(63, 102, 216);
/* oklch */ color: oklch(54.6% 0.180 266.2);

Tailwind

colors: {
  custom: {
    50: '#8791e5',
    500: '#3f66d8',
    950: '#000000',
  },
}

SCSS

$custom: #3f66d8;
$custom-light: #8791e5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66d8",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 216
  },
  "hsl": {
    "h": 224.706,
    "s": 66.234,
    "l": 54.706
  },
  "oklch": {
    "l": 0.5463,
    "c": 0.18047,
    "h": 266.2
  },
  "luminance": 0.15517
}

Semantic roles & 50–950 ramp

primary

#3F66D8

secondary

#DAC999

accent

#BE3FE9

background

#F9F8FE

surface

#F1F0FC

border

#CBCBD5

text

#0D0C16

muted

#7E7D84

Preview Lab

Preview with #3F66D8

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

Preview Lab → · Contrast checker → · Palette generator →