#66C4E9#66C4E9

#66C4E9 is a light, moderate cyan. Relative luminance 0.482; OKLCH L 77.7% C 0.103 H 226.2°. Best body text is #000000 at 10.64:1 contrast (WCAG AA passes).

Color values

HEX	#66C4E9
RGB	rgb(102, 196, 233)
HSL	hsl(197, 75%, 66%)
HSV	hsv(197, 56%, 91%)
CMYK	cmyk(56.2%, 15.9%, 0%, 8.6%)
CIE-LAB	lab(74.94, -17.54, -26.83)
CIE-LCH	lch(74.94, 32.06, 236.83°)
OKLab	oklab(77.68% -0.0716 -0.0746)
OKLCH	oklch(77.68% 0.103 226.2)
XYZ	xyz(39.9217, 48.1841, 84.2716)
Luminance	0.4819 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66C4E9 #E98B66

analogous

#66E9CD #66C4E9 #6682E9

triadic

#66C4E9 #E966C4 #C4E966

tetradic

#66C4E9 #CD66E9 #E98B66 #82E966

square

#66C4E9 #CD66E9 #E98B66 #82E966

split-complementary

#66C4E9 #E96682 #E9CD66

monochromatic

#1B8DBA #30AFE1 #66C4E9 #9CD9F1 #D1EDF8

Accessibility & contrast

On white

1.97

#66C4E9 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.64

#66C4E9 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66C4E9

10.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66C4E9	#FFFFFF	#000000	##000000
##66C4E9	1.00	1.97	10.64	10.64
#FFFFFF	1.97	1.00	21.00	21.00
#000000	10.64	21.00	1.00	1.00
##000000	10.64	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B0C0EB

Deuteranopia (green-blind)

#9DB2E9

Tritanopia (blue-blind)

#00CFD0

Achromatopsia (no color)

#B8B8B8

Design tokens & code

CSS

--color: #66c4e9;
/* rgb */ color: rgb(102, 196, 233);
/* oklch */ color: oklch(77.7% 0.103 226.2);

Tailwind

colors: {
  custom: {
    50: '#9bd6f0',
    500: '#66c4e9',
    950: '#000000',
  },
}

SCSS

$custom: #66c4e9;
$custom-light: #9bd6f0;
$custom-dark: #000000;

JSON

{
  "hex": "#66c4e9",
  "rgb": {
    "r": 102,
    "g": 196,
    "b": 233
  },
  "hsl": {
    "h": 196.947,
    "s": 74.857,
    "l": 65.686
  },
  "oklch": {
    "l": 0.77681,
    "c": 0.10342,
    "h": 226.2
  },
  "luminance": 0.48188
}

Semantic roles & 50–950 ramp

primary

#66C4E9

secondary

#EBCCC0

accent

#470ED7

background

#FAFDFE

surface

#F4FAFD

border

#CED3D5

text

#0F1416

muted

#7F8384

Preview Lab

Preview with #66C4E9

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

Preview Lab → · Contrast checker → · Palette generator →