#3866BC#3866BC

#3866BC is a mid, vivid blue. Relative luminance 0.140; OKLCH L 52.3% C 0.145 H 261.6°. Best body text is #FFFFFF at 5.53:1 contrast (WCAG AA passes).

Color values

HEX	#3866BC
RGB	rgb(56, 102, 188)
HSL	hsl(219, 54%, 48%)
HSV	hsv(219, 70%, 74%)
CMYK	cmyk(70.2%, 45.7%, 0%, 26.3%)
CIE-LAB	lab(44.19, 13.46, -49.95)
CIE-LCH	lch(44.19, 51.73, 285.08°)
OKLab	oklab(52.33% -0.0211 -0.143)
OKLCH	oklch(52.33% 0.145 261.6)
XYZ	xyz(15.4561, 13.9727, 49.4496)
Luminance	0.1397 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3866BC #BC8E38

analogous

#38A8BC #3866BC #4C38BC

triadic

#3866BC #BC3866 #66BC38

tetradic

#3866BC #BC38A8 #BC8E38 #38BC4C

square

#3866BC #BC38A8 #BC8E38 #38BC4C

split-complementary

#3866BC #BC4C38 #A8BC38

monochromatic

#1C335E #2A4C8D #3866BC #6188D0 #90ABDE

Accessibility & contrast

On white

5.53

#3866BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.79

#3866BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3866BC

5.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3866BC	#FFFFFF	#000000	##FFFFFF
##3866BC	1.00	5.53	3.79	5.53
#FFFFFF	5.53	1.00	21.00	1.00
#000000	3.79	21.00	1.00	21.00
##FFFFFF	5.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3A6FBF

Deuteranopia (green-blind)

#2063BA

Tritanopia (blue-blind)

#007A88

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3866bc;
/* rgb */ color: rgb(56, 102, 188);
/* oklch */ color: oklch(52.3% 0.145 261.6);

Tailwind

colors: {
  custom: {
    50: '#7e91d1',
    500: '#3866bc',
    950: '#000000',
  },
}

SCSS

$custom: #3866bc;
$custom-light: #7e91d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3866bc",
  "rgb": {
    "r": 56,
    "g": 102,
    "b": 188
  },
  "hsl": {
    "h": 219.091,
    "s": 54.098,
    "l": 47.843
  },
  "oklch": {
    "l": 0.5233,
    "c": 0.14456,
    "h": 261.6
  },
  "luminance": 0.13974
}

Semantic roles & 50–950 ramp

primary

#3866BC

secondary

#C9B287

accent

#AA4ADD

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3866BC

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

Preview Lab → · Contrast checker → · Palette generator →