#3666BA#3666BA

#3666BA is a mid, vivid blue. Relative luminance 0.138; OKLCH L 52.1% C 0.142 H 260.7°. Best body text is #FFFFFF at 5.58:1 contrast (WCAG AA passes).

Color values

HEX#3666BA
RGBrgb(54, 102, 186)
HSLhsl(218, 55%, 47%)
HSVhsv(218, 71%, 73%)
CMYKcmyk(71%, 45.2%, 0%, 27.1%)
CIE-LABlab(43.99, 12.42, -49.12)
CIE-LCHlch(43.99, 50.67, 284.19°)
OKLaboklab(52.11% -0.023 -0.1406)
OKLCHoklch(52.11% 0.142 260.7)
XYZxyz(15.1324, 13.8306, 48.3169)
Luminance0.1383 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#3666BA #BA8A36
analogous
#36A8BA #3666BA #4836BA
triadic
#3666BA #BA3666 #66BA36
tetradic
#3666BA #BA36A8 #BA8A36 #36BA48
square
#3666BA #BA36A8 #BA8A36 #36BA48
split-complementary
#3666BA #BA4836 #A8BA36
monochromatic
#1A325B #284C8B #3666BA #5D87D0 #8DAADE

Accessibility & contrast

On white

5.58
#3666BA on #FFFFFF
AA ✓AA large ✓AAA ✗

On black

3.77
#3666BA on #000000
AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666BA
5.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##3666BA#FFFFFF#000000##FFFFFF
##3666BA1.005.583.775.58
#FFFFFF5.581.0021.001.00
#0000003.7721.001.0021.00
##FFFFFF5.581.0021.001.00

Color blindness preview

Protanopia (red-blind)
#3C6EBD
Deuteranopia (green-blind)
#2262B8
Tritanopia (blue-blind)
#007A87
Achromatopsia (no color)
#686868

Design tokens & code

CSS
--color: #3666ba;
/* rgb */ color: rgb(54, 102, 186);
/* oklch */ color: oklch(52.1% 0.142 260.7);
Tailwind
colors: {
  custom: {
    50: '#7d91cf',
    500: '#3666ba',
    950: '#000000',
  },
}
SCSS
$custom: #3666ba;
$custom-light: #7d91cf;
$custom-dark: #000000;
JSON
{
  "hex": "#3666ba",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 186
  },
  "hsl": {
    "h": 218.182,
    "s": 55,
    "l": 47.059
  },
  "oklch": {
    "l": 0.5211,
    "c": 0.14248,
    "h": 260.7
  },
  "luminance": 0.13832
}

Semantic roles & 50–950 ramp

primary
#3666BA
secondary
#C8AF84
accent
#A849DE
background
#F8F8FC
surface
#EFF0F9
border
#CACBD2
text
#0B0C14
muted
#7C7D82

Preview Lab

Preview with #3666BA

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

Preview Lab → · Contrast checker → · Palette generator →

#3666BA Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva