#66BDF4#66BDF4

#66BDF4 is a light, moderate cyan. Relative luminance 0.458; OKLCH L 76.6% C 0.115 H 238.5°. Best body text is #000000 at 10.15:1 contrast (WCAG AA passes).

Color values

HEX	#66BDF4
RGB	rgb(102, 189, 244)
HSL	hsl(203, 87%, 68%)
HSV	hsv(203, 58%, 96%)
CMYK	cmyk(58.2%, 22.5%, 0%, 4.3%)
CIE-LAB	lab(73.38, -10.57, -35.17)
CIE-LCH	lch(73.38, 36.73, 253.27°)
OKLab	oklab(76.58% -0.0603 -0.0985)
OKLCH	oklch(76.58% 0.115 238.5)
XYZ	xyz(40.0001, 45.7479, 92.2927)
Luminance	0.4575 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66BDF4 #F49D66

analogous

#66F4E4 #66BDF4 #6676F4

triadic

#66BDF4 #F466BD #BDF466

tetradic

#66BDF4 #E466F4 #F49D66 #76F466

square

#66BDF4 #E466F4 #F49D66 #76F466

split-complementary

#66BDF4 #F46676 #F4E466

monochromatic

#0F86D1 #2DA4F0 #66BDF4 #9FD6F8 #D8EEFC

Accessibility & contrast

On white

2.07

#66BDF4 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.15

#66BDF4 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66BDF4

10.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66BDF4	#FFFFFF	#000000	##000000
##66BDF4	1.00	2.07	10.15	10.15
#FFFFFF	2.07	1.00	21.00	21.00
#000000	10.15	21.00	1.00	1.00
##000000	10.15	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A4BCF7

Deuteranopia (green-blind)

#90AEF3

Tritanopia (blue-blind)

#00CBD0

Achromatopsia (no color)

#B4B4B4

Design tokens & code

CSS

--color: #66bdf4;
/* rgb */ color: rgb(102, 189, 244);
/* oklch */ color: oklch(76.6% 0.115 238.5);

Tailwind

colors: {
  custom: {
    50: '#9cd0f8',
    500: '#66bdf4',
    950: '#000000',
  },
}

SCSS

$custom: #66bdf4;
$custom-light: #9cd0f8;
$custom-dark: #000000;

JSON

{
  "hex": "#66bdf4",
  "rgb": {
    "r": 102,
    "g": 189,
    "b": 244
  },
  "hsl": {
    "h": 203.239,
    "s": 86.585,
    "l": 67.843
  },
  "oklch": {
    "l": 0.76579,
    "c": 0.11547,
    "h": 238.5
  },
  "luminance": 0.45752
}

Semantic roles & 50–950 ramp

primary

#66BDF4

secondary

#F1D6C5

accent

#5902E3

background

#FAFCFF

surface

#F4F9FF

border

#CED2D7

text

#0F1417

muted

#7F8285

Preview Lab

Preview with #66BDF4

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

Preview Lab → · Contrast checker → · Palette generator →