#66B1F5#66B1F5

#66B1F5 is a light, vivid cyan. Relative luminance 0.409; OKLCH L 74.0% C 0.124 H 247.6°. Best body text is #000000 at 9.17:1 contrast (WCAG AA passes).

Color values

HEX	#66B1F5
RGB	rgb(102, 177, 245)
HSL	hsl(209, 88%, 68%)
HSV	hsv(209, 58%, 96%)
CMYK	cmyk(58.4%, 27.8%, 0%, 3.9%)
CIE-LAB	lab(70.08, -3.72, -40.85)
CIE-LCH	lch(70.08, 41.02, 264.79°)
OKLab	oklab(73.98% -0.0473 -0.1149)
OKLCH	oklch(73.98% 0.124 247.6)
XYZ	xyz(37.6771, 40.8582, 92.2694)
Luminance	0.4086 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B1F5 #F5AA66

analogous

#66F5F1 #66B1F5 #666AF5

triadic

#66B1F5 #F566B1 #B1F566

tetradic

#66B1F5 #F166F5 #F5AA66 #6AF566

square

#66B1F5 #F166F5 #F5AA66 #6AF566

split-complementary

#66B1F5 #F5666A #F5F166

monochromatic

#0E75D3 #2D94F1 #66B1F5 #9FCEF9 #D9ECFD

Accessibility & contrast

On white

2.29

#66B1F5 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.17

#66B1F5 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B1F5

9.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B1F5	#FFFFFF	#000000	##000000
##66B1F5	1.00	2.29	9.17	9.17
#FFFFFF	2.29	1.00	21.00	21.00
#000000	9.17	21.00	1.00	1.00
##000000	9.17	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#94B3F8

Deuteranopia (green-blind)

#81A5F4

Tritanopia (blue-blind)

#00C1C9

Achromatopsia (no color)

#ABABAB

Design tokens & code

CSS

--color: #66b1f5;
/* rgb */ color: rgb(102, 177, 245);
/* oklch */ color: oklch(74.0% 0.124 247.6);

Tailwind

colors: {
  custom: {
    50: '#9cc8f8',
    500: '#66b1f5',
    950: '#000000',
  },
}

SCSS

$custom: #66b1f5;
$custom-light: #9cc8f8;
$custom-dark: #000000;

JSON

{
  "hex": "#66b1f5",
  "rgb": {
    "r": 102,
    "g": 177,
    "b": 245
  },
  "hsl": {
    "h": 208.531,
    "s": 87.73,
    "l": 68.039
  },
  "oklch": {
    "l": 0.73981,
    "c": 0.12427,
    "h": 247.6
  },
  "luminance": 0.40862
}

Semantic roles & 50–950 ramp

primary

#66B1F5

secondary

#F1DAC6

accent

#6D01E4

background

#FAFCFF

surface

#F4F8FF

border

#CED1D7

text

#0F1317

muted

#7F8285

Preview Lab

Preview with #66B1F5

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

Preview Lab → · Contrast checker → · Palette generator →