#66A5EF#66A5EF

#66A5EF is a light, vivid cyan. Relative luminance 0.360; OKLCH L 71.1% C 0.127 H 253.4°. Best body text is #000000 at 8.19:1 contrast (WCAG AA passes).

Color values

HEX	#66A5EF
RGB	rgb(102, 165, 239)
HSL	hsl(212, 81%, 67%)
HSV	hsv(212, 57%, 94%)
CMYK	cmyk(57.3%, 31%, 0%, 6.3%)
CIE-LAB	lab(66.49, 1.13, -43.19)
CIE-LCH	lch(66.49, 43.21, 271.50°)
OKLab	oklab(71.08% -0.0362 -0.1218)
OKLCH	oklch(71.08% 0.127 253.4)
XYZ	xyz(34.5091, 35.9641, 86.7678)
Luminance	0.3597 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66A5EF #EFB066

analogous

#66E9EF #66A5EF #6C66EF

triadic

#66A5EF #EF66A5 #A5EF66

tetradic

#66A5EF #EF66E9 #EFB066 #66EF6C

square

#66A5EF #EF66E9 #EFB066 #66EF6C

split-complementary

#66A5EF #EF6C66 #E9EF66

monochromatic

#1566C6 #2F84E9 #66A5EF #9DC6F5 #D5E6FB

Accessibility & contrast

On white

2.56

#66A5EF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.19

#66A5EF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66A5EF

8.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66A5EF	#FFFFFF	#000000	##000000
##66A5EF	1.00	2.56	8.19	8.19
#FFFFFF	2.56	1.00	21.00	21.00
#000000	8.19	21.00	1.00	1.00
##000000	8.19	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#86A9F2

Deuteranopia (green-blind)

#749CED

Tritanopia (blue-blind)

#00B6BF

Achromatopsia (no color)

#A2A2A2

Design tokens & code

CSS

--color: #66a5ef;
/* rgb */ color: rgb(102, 165, 239);
/* oklch */ color: oklch(71.1% 0.127 253.4);

Tailwind

colors: {
  custom: {
    50: '#9bbff4',
    500: '#66a5ef',
    950: '#000000',
  },
}

SCSS

$custom: #66a5ef;
$custom-light: #9bbff4;
$custom-dark: #000000;

JSON

{
  "hex": "#66a5ef",
  "rgb": {
    "r": 102,
    "g": 165,
    "b": 239
  },
  "hsl": {
    "h": 212.409,
    "s": 81.065,
    "l": 66.863
  },
  "oklch": {
    "l": 0.71079,
    "c": 0.12706,
    "h": 253.4
  },
  "luminance": 0.35967
}

Semantic roles & 50–950 ramp

primary

#66A5EF

secondary

#EEDAC2

accent

#7B08DD

background

#FAFBFE

surface

#F4F6FD

border

#CED0D5

text

#0F1217

muted

#7F8185

Preview Lab

Preview with #66A5EF

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

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