#3866D9#3866D9

#3866D9 is a mid, vivid blue. Relative luminance 0.154; OKLCH L 54.4% C 0.184 H 264.6°. Best body text is #FFFFFF at 5.16:1 contrast (WCAG AA passes).

Color values

HEX	#3866D9
RGB	rgb(56, 102, 217)
HSL	hsl(223, 68%, 54%)
HSV	hsv(223, 74%, 85%)
CMYK	cmyk(74.2%, 53%, 0%, 14.9%)
CIE-LAB	lab(46.11, 24.13, -63.53)
CIE-LCH	lch(46.11, 67.96, 290.80°)
OKLab	oklab(54.41% -0.0174 -0.183)
OKLCH	oklch(54.41% 0.184 264.6)
XYZ	xyz(18.9022, 15.3512, 67.5991)
Luminance	0.1535 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3866D9 #D9AB38

analogous

#38B6D9 #3866D9 #5A38D9

triadic

#3866D9 #D93866 #66D938

tetradic

#3866D9 #D938B6 #D9AB38 #38D95A

square

#3866D9 #D938B6 #D9AB38 #38D95A

split-complementary

#3866D9 #D95A38 #B6D938

monochromatic

#18357E #224BB2 #3866D9 #6B8EE3 #9FB5ED

Accessibility & contrast

On white

5.16

#3866D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.07

#3866D9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3866D9

5.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3866D9	#FFFFFF	#000000	##FFFFFF
##3866D9	1.00	5.16	4.07	5.16
#FFFFFF	5.16	1.00	21.00	1.00
#000000	4.07	21.00	1.00	21.00
##FFFFFF	5.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0C75DD

Deuteranopia (green-blind)

#0066D7

Tritanopia (blue-blind)

#008296

Achromatopsia (no color)

#6D6D6D

Design tokens & code

CSS

--color: #3866d9;
/* rgb */ color: rgb(56, 102, 217);
/* oklch */ color: oklch(54.4% 0.184 264.6);

Tailwind

colors: {
  custom: {
    50: '#8491e5',
    500: '#3866d9',
    950: '#000000',
  },
}

SCSS

$custom: #3866d9;
$custom-light: #8491e5;
$custom-dark: #000000;

JSON

{
  "hex": "#3866d9",
  "rgb": {
    "r": 56,
    "g": 102,
    "b": 217
  },
  "hsl": {
    "h": 222.857,
    "s": 67.932,
    "l": 53.529
  },
  "oklch": {
    "l": 0.54405,
    "c": 0.1838,
    "h": 264.6
  },
  "luminance": 0.15353
}

Semantic roles & 50–950 ramp

primary

#3866D9

secondary

#D9C594

accent

#B93DEB

background

#F8F8FE

surface

#F0F0FC

border

#CBCBD5

text

#0C0C16

muted

#7D7D84

Preview Lab

Preview with #3866D9

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

Preview Lab → · Contrast checker → · Palette generator →