#3866B0#3866B0

#3866B0 is a mid, vivid blue. Relative luminance 0.135; OKLCH L 51.5% C 0.128 H 259.5°. Best body text is #FFFFFF at 5.68:1 contrast (WCAG AA passes).

Color values

HEX#3866B0
RGBrgb(56, 102, 176)
HSLhsl(217, 52%, 45%)
HSVhsv(217, 68%, 69%)
CMYKcmyk(68.2%, 42%, 0%, 31%)
CIE-LABlab(43.47, 9.06, -44.10)
CIE-LCHlch(43.47, 45.02, 281.61°)
OKLaboklab(51.54% -0.0233 -0.1258)
OKLCHoklch(51.54% 0.128 259.5)
XYZxyz(14.2159, 13.4767, 42.9179)
Luminance0.1348 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#3866B0 #B08238
analogous
#38A2B0 #3866B0 #4638B0
triadic
#3866B0 #B03866 #66B038
tetradic
#3866B0 #B038A2 #B08238 #38B046
square
#3866B0 #B038A2 #B08238 #38B046
split-complementary
#3866B0 #B04638 #A2B038
monochromatic
#1A3053 #294B82 #3866B0 #5B86CB #89A8D9

Accessibility & contrast

On white

5.68
#3866B0 on #FFFFFF
AA ✓AA large ✓AAA ✗

On black

3.70
#3866B0 on #000000
AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3866B0
5.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##3866B0#FFFFFF#000000##FFFFFF
##3866B01.005.683.705.68
#FFFFFF5.681.0021.001.00
#0000003.7021.001.0021.00
##FFFFFF5.681.0021.001.00

Color blindness preview

Protanopia (red-blind)
#436DB3
Deuteranopia (green-blind)
#3062AE
Tritanopia (blue-blind)
#007782
Achromatopsia (no color)
#676767

Design tokens & code

CSS
--color: #3866b0;
/* rgb */ color: rgb(56, 102, 176);
/* oklch */ color: oklch(51.5% 0.128 259.5);
Tailwind
colors: {
  custom: {
    50: '#7c91c8',
    500: '#3866b0',
    950: '#000000',
  },
}
SCSS
$custom: #3866b0;
$custom-light: #7c91c8;
$custom-dark: #000000;
JSON
{
  "hex": "#3866b0",
  "rgb": {
    "r": 56,
    "g": 102,
    "b": 176
  },
  "hsl": {
    "h": 217,
    "s": 51.724,
    "l": 45.49
  },
  "oklch": {
    "l": 0.5154,
    "c": 0.12798,
    "h": 259.5
  },
  "luminance": 0.13478
}

Semantic roles & 50–950 ramp

primary
#3866B0
secondary
#C4AA80
accent
#A54DDB
background
#F8F8FC
surface
#EFF0F8
border
#CACBD1
text
#0B0C13
muted
#7C7D82

Preview Lab

Preview with #3866B0

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

Preview Lab → · Contrast checker → · Palette generator →

#3866B0 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva