#66B4E5#66B4E5

#66B4E5 is a light, moderate cyan. Relative luminance 0.411; OKLCH L 73.9% C 0.105 H 238.0°. Best body text is #000000 at 9.22:1 contrast (WCAG AA passes).

Color values

HEX	#66B4E5
RGB	rgb(102, 180, 229)
HSL	hsl(203, 71%, 65%)
HSV	hsv(203, 55%, 90%)
CMYK	cmyk(55.5%, 21.4%, 0%, 10.2%)
CIE-LAB	lab(70.26, -10.26, -31.86)
CIE-LCH	lch(70.26, 33.47, 252.16°)
OKLab	oklab(73.91% -0.0556 -0.089)
OKLCH	oklch(73.91% 0.105 238)
XYZ	xyz(35.9384, 41.1213, 80.1569)
Luminance	0.4112 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B4E5 #E59766

analogous

#66E5D7 #66B4E5 #6674E5

triadic

#66B4E5 #E566B4 #B4E566

tetradic

#66B4E5 #D766E5 #E59766 #74E566

square

#66B4E5 #D766E5 #E59766 #74E566

split-complementary

#66B4E5 #E56674 #E5D766

monochromatic

#1E79B2 #329ADC #66B4E5 #9ACEEE #CFE7F7

Accessibility & contrast

On white

2.28

#66B4E5 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.22

#66B4E5 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B4E5

9.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B4E5	#FFFFFF	#000000	##000000
##66B4E5	1.00	2.28	9.22	9.22
#FFFFFF	2.28	1.00	21.00	21.00
#000000	9.22	21.00	1.00	1.00
##000000	9.22	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9EB3E7

Deuteranopia (green-blind)

#8CA6E4

Tritanopia (blue-blind)

#00C0C4

Achromatopsia (no color)

#ACACAC

Design tokens & code

CSS

--color: #66b4e5;
/* rgb */ color: rgb(102, 180, 229);
/* oklch */ color: oklch(73.9% 0.105 238.0);

Tailwind

colors: {
  custom: {
    50: '#9acaed',
    500: '#66b4e5',
    950: '#000000',
  },
}

SCSS

$custom: #66b4e5;
$custom-light: #9acaed;
$custom-dark: #000000;

JSON

{
  "hex": "#66b4e5",
  "rgb": {
    "r": 102,
    "g": 180,
    "b": 229
  },
  "hsl": {
    "h": 203.15,
    "s": 70.95,
    "l": 64.902
  },
  "oklch": {
    "l": 0.7391,
    "c": 0.10494,
    "h": 238
  },
  "luminance": 0.41124
}

Semantic roles & 50–950 ramp

primary

#66B4E5

secondary

#E9CEBE

accent

#5D13D3

background

#FAFCFE

surface

#F3F8FD

border

#CDD1D5

text

#0F1316

muted

#7F8284

Preview Lab

Preview with #66B4E5

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

Preview Lab → · Contrast checker → · Palette generator →