#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
RGB	rgb(102, 177, 244)
HSL	hsl(208, 87%, 68%)
HSV	hsv(208, 58%, 96%)
CMYK	cmyk(58.2%, 27.5%, 0%, 4.3%)
CIE-LAB	lab(70.03, -4.03, -40.38)
CIE-LCH	lch(70.03, 40.58, 264.29°)
OKLab	oklab(73.93% -0.0476 -0.1135)
OKLCH	oklch(73.93% 0.123 247.3)
XYZ	xyz(37.5248, 40.7973, 91.4676)
Luminance	0.4080 (WCAG relative)
Temperature	cool
Family	cyan

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
##66B1F4	1.00	2.29	9.16	9.16
#FFFFFF	2.29	1.00	21.00	21.00
#000000	9.16	21.00	1.00	1.00
##000000	9.16	21.00	1.00	1.00

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 →