#66ADE4#66ADE4

#66ADE4 is a light, moderate cyan. Relative luminance 0.383; OKLCH L 72.3% C 0.108 H 243.4°. Best body text is #000000 at 8.66:1 contrast (WCAG AA passes).

Color values

HEX	#66ADE4
RGB	rgb(102, 173, 228)
HSL	hsl(206, 70%, 65%)
HSV	hsv(206, 55%, 89%)
CMYK	cmyk(55.3%, 24.1%, 0%, 10.6%)
CIE-LAB	lab(68.25, -6.74, -34.43)
CIE-LCH	lch(68.25, 35.09, 258.92°)
OKLab	oklab(72.3% -0.0482 -0.0964)
OKLCH	oklch(72.3% 0.108 243.4)
XYZ	xyz(34.4216, 38.3104, 78.9644)
Luminance	0.3831 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66ADE4 #E49D66

analogous

#66E4DC #66ADE4 #666EE4

triadic

#66ADE4 #E466AD #ADE466

tetradic

#66ADE4 #DC66E4 #E49D66 #6EE466

square

#66ADE4 #DC66E4 #E49D66 #6EE466

split-complementary

#66ADE4 #E4666E #E4DC66

monochromatic

#1F71B0 #3291DB #66ADE4 #9AC9ED #CEE5F6

Accessibility & contrast

On white

2.42

#66ADE4 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.66

#66ADE4 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66ADE4

8.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66ADE4	#FFFFFF	#000000	##000000
##66ADE4	1.00	2.42	8.66	8.66
#FFFFFF	2.42	1.00	21.00	21.00
#000000	8.66	21.00	1.00	1.00
##000000	8.66	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#95AEE7

Deuteranopia (green-blind)

#84A1E3

Tritanopia (blue-blind)

#00BAC0

Achromatopsia (no color)

#A6A6A6

Design tokens & code

CSS

--color: #66ade4;
/* rgb */ color: rgb(102, 173, 228);
/* oklch */ color: oklch(72.3% 0.108 243.4);

Tailwind

colors: {
  custom: {
    50: '#9ac5ec',
    500: '#66ade4',
    950: '#000000',
  },
}

SCSS

$custom: #66ade4;
$custom-light: #9ac5ec;
$custom-dark: #000000;

JSON

{
  "hex": "#66ade4",
  "rgb": {
    "r": 102,
    "g": 173,
    "b": 228
  },
  "hsl": {
    "h": 206.19,
    "s": 70,
    "l": 64.706
  },
  "oklch": {
    "l": 0.72305,
    "c": 0.10779,
    "h": 243.4
  },
  "luminance": 0.38313
}

Semantic roles & 50–950 ramp

primary

#66ADE4

secondary

#E9D0BD

accent

#6714D2

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0F1216

muted

#7E8184

Preview Lab

Preview with #66ADE4

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

Preview Lab → · Contrast checker → · Palette generator →