#66B5F5#66B5F5

#66B5F5 is a light, vivid cyan. Relative luminance 0.425; OKLCH L 74.9% C 0.121 H 244.9°. Best body text is #000000 at 9.49:1 contrast (WCAG AA passes).

Color values

HEX	#66B5F5
RGB	rgb(102, 181, 245)
HSL	hsl(207, 88%, 68%)
HSV	hsv(207, 58%, 96%)
CMYK	cmyk(58.4%, 26.1%, 0%, 3.9%)
CIE-LAB	lab(71.19, -5.93, -39.12)
CIE-LCH	lch(71.19, 39.57, 261.38°)
OKLab	oklab(74.86% -0.0515 -0.1099)
OKLCH	oklch(74.86% 0.121 244.9)
XYZ	xyz(38.4787, 42.4616, 92.5366)
Luminance	0.4247 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B5F5 #F5A666

analogous

#66F5ED #66B5F5 #666DF5

triadic

#66B5F5 #F566B5 #B5F566

tetradic

#66B5F5 #ED66F5 #F5A666 #6DF566

square

#66B5F5 #ED66F5 #F5A666 #6DF566

split-complementary

#66B5F5 #F5666D #F5ED66

monochromatic

#0E7BD3 #2D99F1 #66B5F5 #9FD1F9 #D9EDFD

Accessibility & contrast

On white

2.21

#66B5F5 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.49

#66B5F5 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B5F5

9.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B5F5	#FFFFFF	#000000	##000000
##66B5F5	1.00	2.21	9.49	9.49
#FFFFFF	2.21	1.00	21.00	21.00
#000000	9.49	21.00	1.00	1.00
##000000	9.49	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#99B6F8

Deuteranopia (green-blind)

#86A8F4

Tritanopia (blue-blind)

#00C4CB

Achromatopsia (no color)

#AEAEAE

Design tokens & code

CSS

--color: #66b5f5;
/* rgb */ color: rgb(102, 181, 245);
/* oklch */ color: oklch(74.9% 0.121 244.9);

Tailwind

colors: {
  custom: {
    50: '#9ccbf8',
    500: '#66b5f5',
    950: '#000000',
  },
}

SCSS

$custom: #66b5f5;
$custom-light: #9ccbf8;
$custom-dark: #000000;

JSON

{
  "hex": "#66b5f5",
  "rgb": {
    "r": 102,
    "g": 181,
    "b": 245
  },
  "hsl": {
    "h": 206.853,
    "s": 87.73,
    "l": 68.039
  },
  "oklch": {
    "l": 0.74857,
    "c": 0.12135,
    "h": 244.9
  },
  "luminance": 0.42465
}

Semantic roles & 50–950 ramp

primary

#66B5F5

secondary

#F1D9C6

accent

#6701E4

background

#FAFCFF

surface

#F4F8FF

border

#CED1D7

text

#0F1317

muted

#7F8285

Preview Lab

Preview with #66B5F5

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

Preview Lab → · Contrast checker → · Palette generator →