#3866BB#3866BB

#3866BB is a mid, vivid blue. Relative luminance 0.139; OKLCH L 52.3% C 0.143 H 261.5°. Best body text is #FFFFFF at 5.55:1 contrast (WCAG AA passes).

Color values

HEX	#3866BB
RGB	rgb(56, 102, 187)
HSL	hsl(219, 54%, 48%)
HSV	hsv(219, 70%, 73%)
CMYK	cmyk(70.1%, 45.5%, 0%, 26.7%)
CIE-LAB	lab(44.13, 13.09, -49.47)
CIE-LCH	lch(44.13, 51.17, 284.82°)
OKLab	oklab(52.26% -0.0213 -0.1416)
OKLCH	oklch(52.26% 0.143 261.5)
XYZ	xyz(15.3487, 13.9298, 48.8839)
Luminance	0.1393 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3866BB #BB8D38

analogous

#38A8BB #3866BB #4B38BB

triadic

#3866BB #BB3866 #66BB38

tetradic

#3866BB #BB38A8 #BB8D38 #38BB4B

square

#3866BB #BB38A8 #BB8D38 #38BB4B

split-complementary

#3866BB #BB4B38 #A8BB38

monochromatic

#1C335D #2A4C8C #3866BB #6188D0 #90ABDE

Accessibility & contrast

On white

5.55

#3866BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.79

#3866BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3866BB

5.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3866BB	#FFFFFF	#000000	##FFFFFF
##3866BB	1.00	5.55	3.79	5.55
#FFFFFF	5.55	1.00	21.00	1.00
#000000	3.79	21.00	1.00	21.00
##FFFFFF	5.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B6FBE

Deuteranopia (green-blind)

#2163B9

Tritanopia (blue-blind)

#007A87

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3866bb;
/* rgb */ color: rgb(56, 102, 187);
/* oklch */ color: oklch(52.3% 0.143 261.5);

Tailwind

colors: {
  custom: {
    50: '#7e91d0',
    500: '#3866bb',
    950: '#000000',
  },
}

SCSS

$custom: #3866bb;
$custom-light: #7e91d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3866bb",
  "rgb": {
    "r": 56,
    "g": 102,
    "b": 187
  },
  "hsl": {
    "h": 218.931,
    "s": 53.909,
    "l": 47.647
  },
  "oklch": {
    "l": 0.52262,
    "c": 0.14319,
    "h": 261.5
  },
  "luminance": 0.13931
}

Semantic roles & 50–950 ramp

primary

#3866BB

secondary

#C8B186

accent

#AA4BDD

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3866BB

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

Preview Lab → · Contrast checker → · Palette generator →