#3F66BF#3F66BF

#3F66BF is a mid, vivid blue. Relative luminance 0.143; OKLCH L 52.9% C 0.146 H 264.2°. Best body text is #FFFFFF at 5.43:1 contrast (WCAG AA passes).

Color values

HEX	#3F66BF
RGB	rgb(63, 102, 191)
HSL	hsl(222, 50%, 50%)
HSV	hsv(222, 67%, 75%)
CMYK	cmyk(67%, 46.6%, 0%, 25.1%)
CIE-LAB	lab(44.69, 15.65, -50.88)
CIE-LCH	lch(44.69, 53.23, 287.10°)
OKLab	oklab(52.85% -0.0148 -0.1456)
OKLCH	oklch(52.85% 0.146 264.2)
XYZ	xyz(16.2019, 14.3195, 51.1902)
Luminance	0.1432 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66BF #BF983F

analogous

#3FA6BF #3F66BF #583FBF

triadic

#3F66BF #BF3F66 #66BF3F

tetradic

#3F66BF #BF3FA6 #BF983F #3FBF58

square

#3F66BF #BF3FA6 #BF983F #3FBF58

split-complementary

#3F66BF #BF583F #A6BF3F

monochromatic

#213563 #304D91 #3F66BF #6D8ACF #9BAFDE

Accessibility & contrast

On white

5.43

#3F66BF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.86

#3F66BF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66BF

5.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66BF	#FFFFFF	#000000	##FFFFFF
##3F66BF	1.00	5.43	3.86	5.43
#FFFFFF	5.43	1.00	21.00	1.00
#000000	3.86	21.00	1.00	21.00
##FFFFFF	5.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3970C2

Deuteranopia (green-blind)

#1F64BD

Tritanopia (blue-blind)

#007B89

Achromatopsia (no color)

#6A6A6A

Design tokens & code

CSS

--color: #3f66bf;
/* rgb */ color: rgb(63, 102, 191);
/* oklch */ color: oklch(52.9% 0.146 264.2);

Tailwind

colors: {
  custom: {
    50: '#8291d3',
    500: '#3f66bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f66bf;
$custom-light: #8291d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66bf",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 191
  },
  "hsl": {
    "h": 221.719,
    "s": 50.394,
    "l": 49.804
  },
  "oklch": {
    "l": 0.52853,
    "c": 0.14638,
    "h": 264.2
  },
  "luminance": 0.14321
}

Semantic roles & 50–950 ramp

primary

#3F66BF

secondary

#CAB890

accent

#AF4EDA

background

#F8F8FD

surface

#F0F0FA

border

#CBCBD3

text

#0C0C14

muted

#7D7D83

Preview Lab

Preview with #3F66BF

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

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