#66B4FB#66B4FB

#66B4FB is a light, vivid cyan. Relative luminance 0.424; OKLCH L 74.9% C 0.129 H 247.8°. Best body text is #000000 at 9.49:1 contrast (WCAG AA passes).

Color values

HEX#66B4FB
RGBrgb(102, 180, 251)
HSLhsl(209, 95%, 69%)
HSVhsv(209, 59%, 98%)
CMYKcmyk(59.4%, 28.3%, 0%, 1.6%)
CIE-LABlab(71.17, -3.51, -42.40)
CIE-LCHlch(71.17, 42.55, 265.27°)
OKLaboklab(74.92% -0.0487 -0.1194)
OKLCHoklch(74.92% 0.129 247.8)
XYZxyz(39.2070, 42.4287, 97.3715)
Luminance0.4243 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#66B4FB #FBAD66
analogous
#66FBF8 #66B4FB #666AFB
triadic
#66B4FB #FB66B4 #B4FB66
tetradic
#66B4FB #F866FB #FBAD66 #6AFB66
square
#66B4FB #F866FB #FBAD66 #6AFB66
split-complementary
#66B4FB #FB666A #FBF866
monochromatic
#0678E1 #2A97F9 #66B4FB #A2D1FD #DDEEFE

Accessibility & contrast

On white

2.21
#66B4FB on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

9.49
#66B4FB on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B4FB
9.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##66B4FB#FFFFFF#000000##000000
##66B4FB1.002.219.499.49
#FFFFFF2.211.0021.0021.00
#0000009.4921.001.001.00
##0000009.4921.001.001.00

Color blindness preview

Protanopia (red-blind)
#96B6FE
Deuteranopia (green-blind)
#82A8FA
Tritanopia (blue-blind)
#00C5CD
Achromatopsia (no color)
#AEAEAE

Design tokens & code

CSS
--color: #66b4fb;
/* rgb */ color: rgb(102, 180, 251);
/* oklch */ color: oklch(74.9% 0.129 247.8);
Tailwind
colors: {
  custom: {
    50: '#9dcafd',
    500: '#66b4fb',
    950: '#000000',
  },
}
SCSS
$custom: #66b4fb;
$custom-light: #9dcafd;
$custom-dark: #000000;
JSON
{
  "hex": "#66b4fb",
  "rgb": {
    "r": 102,
    "g": 180,
    "b": 251
  },
  "hsl": {
    "h": 208.591,
    "s": 94.904,
    "l": 69.216
  },
  "oklch": {
    "l": 0.74923,
    "c": 0.12892,
    "h": 247.8
  },
  "luminance": 0.42432
}

Semantic roles & 50–950 ramp

primary
#66B4FB
secondary
#F4DDC9
accent
#6D00E6
background
#FAFCFF
surface
#F4F8FF
border
#CED1D7
text
#0F1317
muted
#7F8285

Preview Lab

Preview with #66B4FB

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

Preview Lab → · Contrast checker → · Palette generator →

#66B4FB Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva