#3866B7#3866B7

#3866B7 is a mid, vivid blue. Relative luminance 0.138; OKLCH L 52.0% C 0.138 H 260.8°. Best body text is #FFFFFF at 5.60:1 contrast (WCAG AA passes).

Color values

HEX	#3866B7
RGB	rgb(56, 102, 183)
HSL	hsl(218, 53%, 47%)
HSV	hsv(218, 69%, 72%)
CMYK	cmyk(69.4%, 44.3%, 0%, 28.2%)
CIE-LAB	lab(43.89, 11.62, -47.53)
CIE-LCH	lch(43.89, 48.93, 283.74°)
OKLab	oklab(52% -0.022 -0.1359)
OKLCH	oklch(52% 0.138 260.8)
XYZ	xyz(14.9264, 13.7609, 46.6600)
Luminance	0.1376 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3866B7 #B78938

analogous

#38A6B7 #3866B7 #4A38B7

triadic

#3866B7 #B73866 #66B738

tetradic

#3866B7 #B738A6 #B78938 #38B74A

square

#3866B7 #B738A6 #B78938 #38B74A

split-complementary

#3866B7 #B74A38 #A6B738

monochromatic

#1B3259 #2A4C88 #3866B7 #5E87CE #8DAADC

Accessibility & contrast

On white

5.60

#3866B7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.75

#3866B7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3866B7

5.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3866B7	#FFFFFF	#000000	##FFFFFF
##3866B7	1.00	5.60	3.75	5.60
#FFFFFF	5.60	1.00	21.00	1.00
#000000	3.75	21.00	1.00	21.00
##FFFFFF	5.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3E6EBA

Deuteranopia (green-blind)

#2862B5

Tritanopia (blue-blind)

#007985

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3866b7;
/* rgb */ color: rgb(56, 102, 183);
/* oklch */ color: oklch(52.0% 0.138 260.8);

Tailwind

colors: {
  custom: {
    50: '#7d91cd',
    500: '#3866b7',
    950: '#000000',
  },
}

SCSS

$custom: #3866b7;
$custom-light: #7d91cd;
$custom-dark: #000000;

JSON

{
  "hex": "#3866b7",
  "rgb": {
    "r": 56,
    "g": 102,
    "b": 183
  },
  "hsl": {
    "h": 218.268,
    "s": 53.138,
    "l": 46.863
  },
  "oklch": {
    "l": 0.51995,
    "c": 0.13766,
    "h": 260.8
  },
  "luminance": 0.13762
}

Semantic roles & 50–950 ramp

primary

#3866B7

secondary

#C7AF84

accent

#A84BDD

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3866B7

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

Preview Lab → · Contrast checker → · Palette generator →