#66B5FB#66B5FB

#66B5FB is a light, vivid cyan. Relative luminance 0.428; OKLCH L 75.1% C 0.128 H 247.2°. Best body text is #000000 at 9.57:1 contrast (WCAG AA passes).

Color values

HEX	#66B5FB
RGB	rgb(102, 181, 251)
HSL	hsl(208, 95%, 69%)
HSV	hsv(208, 59%, 98%)
CMYK	cmyk(59.4%, 27.9%, 0%, 1.6%)
CIE-LAB	lab(71.44, -4.06, -41.97)
CIE-LCH	lch(71.44, 42.17, 264.47°)
OKLab	oklab(75.14% -0.0497 -0.1181)
OKLCH	oklch(75.14% 0.128 247.2)
XYZ	xyz(39.4096, 42.8339, 97.4390)
Luminance	0.4284 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B5FB #FBAC66

analogous

#66FBF6 #66B5FB #666BFB

triadic

#66B5FB #FB66B5 #B5FB66

tetradic

#66B5FB #F666FB #FBAC66 #6BFB66

square

#66B5FB #F666FB #FBAC66 #6BFB66

split-complementary

#66B5FB #FB666B #FBF666

monochromatic

#067AE1 #2A98F9 #66B5FB #A2D2FD #DDEFFE

Accessibility & contrast

On white

2.19

#66B5FB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.57

#66B5FB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B5FB

9.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B5FB	#FFFFFF	#000000	##000000
##66B5FB	1.00	2.19	9.57	9.57
#FFFFFF	2.19	1.00	21.00	21.00
#000000	9.57	21.00	1.00	1.00
##000000	9.57	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#97B7FE

Deuteranopia (green-blind)

#83A8FA

Tritanopia (blue-blind)

#00C6CD

Achromatopsia (no color)

#AFAFAF

Design tokens & code

CSS

--color: #66b5fb;
/* rgb */ color: rgb(102, 181, 251);
/* oklch */ color: oklch(75.1% 0.128 247.2);

Tailwind

colors: {
  custom: {
    50: '#9dcbfd',
    500: '#66b5fb',
    950: '#000000',
  },
}

SCSS

$custom: #66b5fb;
$custom-light: #9dcbfd;
$custom-dark: #000000;

JSON

{
  "hex": "#66b5fb",
  "rgb": {
    "r": 102,
    "g": 181,
    "b": 251
  },
  "hsl": {
    "h": 208.188,
    "s": 94.904,
    "l": 69.216
  },
  "oklch": {
    "l": 0.75141,
    "c": 0.12815,
    "h": 247.2
  },
  "luminance": 0.42838
}

Semantic roles & 50–950 ramp

primary

#66B5FB

secondary

#F4DDC9

accent

#6C00E6

background

#FAFCFF

surface

#F4F8FF

border

#CED1D7

text

#0F1317

muted

#7F8285

Preview Lab

Preview with #66B5FB

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

Preview Lab → · Contrast checker → · Palette generator →