#66B4EF#66B4EF

#66B4EF is a light, moderate cyan. Relative luminance 0.417; OKLCH L 74.4% C 0.115 H 243.0°. Best body text is #000000 at 9.34:1 contrast (WCAG AA passes).

Color values

HEX	#66B4EF
RGB	rgb(102, 180, 239)
HSL	hsl(206, 81%, 67%)
HSV	hsv(206, 57%, 94%)
CMYK	cmyk(57.3%, 24.7%, 0%, 6.3%)
CIE-LAB	lab(70.66, -7.23, -36.69)
CIE-LCH	lch(70.66, 37.39, 258.86°)
OKLab	oklab(74.36% -0.0523 -0.1029)
OKLCH	oklch(74.36% 0.115 243)
XYZ	xyz(37.3750, 41.6959, 87.7231)
Luminance	0.4170 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B4EF #EFA166

analogous

#66EFE5 #66B4EF #6670EF

triadic

#66B4EF #EF66B4 #B4EF66

tetradic

#66B4EF #E566EF #EFA166 #70EF66

square

#66B4EF #E566EF #EFA166 #70EF66

split-complementary

#66B4EF #EF6670 #EFE566

monochromatic

#157AC6 #2F99E9 #66B4EF #9DCFF5 #D5EAFB

Accessibility & contrast

On white

2.25

#66B4EF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.34

#66B4EF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B4EF

9.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B4EF	#FFFFFF	#000000	##000000
##66B4EF	1.00	2.25	9.34	9.34
#FFFFFF	2.25	1.00	21.00	21.00
#000000	9.34	21.00	1.00	1.00
##000000	9.34	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9AB5F2

Deuteranopia (green-blind)

#88A7EE

Tritanopia (blue-blind)

#00C2C8

Achromatopsia (no color)

#ADADAD

Design tokens & code

CSS

--color: #66b4ef;
/* rgb */ color: rgb(102, 180, 239);
/* oklch */ color: oklch(74.4% 0.115 243.0);

Tailwind

colors: {
  custom: {
    50: '#9bcaf4',
    500: '#66b4ef',
    950: '#000000',
  },
}

SCSS

$custom: #66b4ef;
$custom-light: #9bcaf4;
$custom-dark: #000000;

JSON

{
  "hex": "#66b4ef",
  "rgb": {
    "r": 102,
    "g": 180,
    "b": 239
  },
  "hsl": {
    "h": 205.839,
    "s": 81.065,
    "l": 66.863
  },
  "oklch": {
    "l": 0.74359,
    "c": 0.11541,
    "h": 243
  },
  "luminance": 0.41699
}

Semantic roles & 50–950 ramp

primary

#66B4EF

secondary

#EED5C2

accent

#6408DD

background

#FAFCFE

surface

#F4F8FD

border

#CED1D5

text

#0F1317

muted

#7F8285

Preview Lab

Preview with #66B4EF

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

Preview Lab → · Contrast checker → · Palette generator →