#66B1F4#66B1F4

#66B1F4 is a light, vivid cyan. Relative luminance 0.408; OKLCH L 73.9% C 0.123 H 247.3°. Best body text is #000000 at 9.16:1 contrast (WCAG AA passes).

Color values

HEX#66B1F4
RGBrgb(102, 177, 244)
HSLhsl(208, 87%, 68%)
HSVhsv(208, 58%, 96%)
CMYKcmyk(58.2%, 27.5%, 0%, 4.3%)
CIE-LABlab(70.03, -4.03, -40.38)
CIE-LCHlch(70.03, 40.58, 264.29°)
OKLaboklab(73.93% -0.0476 -0.1135)
OKLCHoklch(73.93% 0.123 247.3)
XYZxyz(37.5248, 40.7973, 91.4676)
Luminance0.4080 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#66B1F4 #F4A966
analogous
#66F4F0 #66B1F4 #666AF4
triadic
#66B1F4 #F466B1 #B1F466
tetradic
#66B1F4 #F066F4 #F4A966 #6AF466
square
#66B1F4 #F066F4 #F4A966 #6AF466
split-complementary
#66B1F4 #F4666A #F4F066
monochromatic
#0F75D1 #2D94F0 #66B1F4 #9FCEF8 #D8EBFC

Accessibility & contrast

On white

2.29
#66B1F4 on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

9.16
#66B1F4 on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B1F4
9.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##66B1F4#FFFFFF#000000##000000
##66B1F41.002.299.169.16
#FFFFFF2.291.0021.0021.00
#0000009.1621.001.001.00
##0000009.1621.001.001.00

Color blindness preview

Protanopia (red-blind)
#94B3F7
Deuteranopia (green-blind)
#81A5F3
Tritanopia (blue-blind)
#00C1C8
Achromatopsia (no color)
#ABABAB

Design tokens & code

CSS
--color: #66b1f4;
/* rgb */ color: rgb(102, 177, 244);
/* oklch */ color: oklch(73.9% 0.123 247.3);
Tailwind
colors: {
  custom: {
    50: '#9cc8f8',
    500: '#66b1f4',
    950: '#000000',
  },
}
SCSS
$custom: #66b1f4;
$custom-light: #9cc8f8;
$custom-dark: #000000;
JSON
{
  "hex": "#66b1f4",
  "rgb": {
    "r": 102,
    "g": 177,
    "b": 244
  },
  "hsl": {
    "h": 208.31,
    "s": 86.585,
    "l": 67.843
  },
  "oklch": {
    "l": 0.73933,
    "c": 0.1231,
    "h": 247.3
  },
  "luminance": 0.40801
}

Semantic roles & 50–950 ramp

primary
#66B1F4
secondary
#F1DAC5
accent
#6C02E3
background
#FAFCFF
surface
#F4F8FF
border
#CED1D7
text
#0F1317
muted
#7F8285

Preview Lab

Preview with #66B1F4

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

Preview Lab → · Contrast checker → · Palette generator →

#66B1F4 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva