#66B4E9#66B4E9

#66B4E9 is a light, moderate cyan. Relative luminance 0.413; OKLCH L 74.1% C 0.109 H 240.2°. Best body text is #000000 at 9.27:1 contrast (WCAG AA passes).

Color values

HEX	#66B4E9
RGB	rgb(102, 180, 233)
HSL	hsl(204, 75%, 66%)
HSV	hsv(204, 56%, 91%)
CMYK	cmyk(56.2%, 22.7%, 0%, 8.6%)
CIE-LAB	lab(70.42, -9.05, -33.80)
CIE-LCH	lch(70.42, 34.99, 255.01°)
OKLab	oklab(74.09% -0.0542 -0.0946)
OKLCH	oklch(74.09% 0.109 240.2)
XYZ	xyz(36.5033, 41.3472, 83.1321)
Luminance	0.4135 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B4E9 #E99B66

analogous

#66E9DD #66B4E9 #6672E9

triadic

#66B4E9 #E966B4 #B4E966

tetradic

#66B4E9 #DD66E9 #E99B66 #72E966

square

#66B4E9 #DD66E9 #E99B66 #72E966

split-complementary

#66B4E9 #E96672 #E9DD66

monochromatic

#1B79BA #309AE1 #66B4E9 #9CCEF1 #D1E8F8

Accessibility & contrast

On white

2.27

#66B4E9 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.27

#66B4E9 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B4E9

9.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B4E9	#FFFFFF	#000000	##000000
##66B4E9	1.00	2.27	9.27	9.27
#FFFFFF	2.27	1.00	21.00	21.00
#000000	9.27	21.00	1.00	1.00
##000000	9.27	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9CB4EB

Deuteranopia (green-blind)

#8AA6E8

Tritanopia (blue-blind)

#00C1C6

Achromatopsia (no color)

#ACACAC

Design tokens & code

CSS

--color: #66b4e9;
/* rgb */ color: rgb(102, 180, 233);
/* oklch */ color: oklch(74.1% 0.109 240.2);

Tailwind

colors: {
  custom: {
    50: '#9bcaf0',
    500: '#66b4e9',
    950: '#000000',
  },
}

SCSS

$custom: #66b4e9;
$custom-light: #9bcaf0;
$custom-dark: #000000;

JSON

{
  "hex": "#66b4e9",
  "rgb": {
    "r": 102,
    "g": 180,
    "b": 233
  },
  "hsl": {
    "h": 204.275,
    "s": 74.857,
    "l": 65.686
  },
  "oklch": {
    "l": 0.74087,
    "c": 0.10902,
    "h": 240.2
  },
  "luminance": 0.4135
}

Semantic roles & 50–950 ramp

primary

#66B4E9

secondary

#EBD1C0

accent

#600ED7

background

#FAFCFE

surface

#F3F8FD

border

#CDD1D5

text

#0F1316

muted

#7F8284

Preview Lab

Preview with #66B4E9

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

Preview Lab → · Contrast checker → · Palette generator →