#66F9DF Color

#66F9DF is rgb(102, 249, 223) in RGB, hsl(169, 92%, 69%) in HSL, and about cmyk(59%, 0%, 10%, 2%) in CMYK. It has no registered color name of its own — the closest is Aquamarine (#7FFFD4), clearly related but distinguishable side by side at ΔE 9.41. Black text is the more readable choice on this background.

#66F9DF

HEX#66F9DF

RGBrgb(102, 249, 223)

HSLhsl(169, 92%, 69%)

HSVhsv(169, 59%, 98%)

CMYKcmyk(59%, 0%, 10%, 2%)

OKLCHoklch(89.6% 0.131 179.5)

LABlab(89.55% -45.82 0.09)

LCHlch(89.55% 45.82 179.89)

What #66F9DF Is Called

Most hex codes have no name: there are 16.7 million of them and a few thousand registered names. These are the named colors nearest to #66F9DF, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Aquamarine#7FFFD4ΔE 9.41 Turquoise#40E0D0ΔE 9.85 Turquoise Blue#00FFEFΔE 11.14 Bright Turquoise#08E8DEΔE 11.65 Fluorescent Blue#15F4EEΔE 12.43 Neon Cyan#00FEFCΔE 14.97

Browse the full index of named colors A-Z or every green in the library.

#66F9DF Channel Values

How #66F9DF breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

Model	Channels	Notes
RGB	R 102 · G 249 · B 223	8-bit channels as sent to the display
HSL	H 169° · S 92% · L 69%	Easiest model for building lighter and darker variants
HSV	H 169° · S 59% · V 98%	Matches the picker in most design tools
CMYK	C 59% · M 0% · Y 10% · K 2%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	1.3:1 vs white · 16.18:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66F9DF background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Contrast is one check, not a full accessibility review.

Fails AAWhite text1.3:1AA normal AA large AAA normal

TextBlack text16.18:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66F9DF in the contrast checker.

Colors That Go With #66F9DF

Pairings derived from color-wheel relationships. The complementary color sits opposite #66F9DF; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base

Complementary

Analogous

Analogous

Triadic

Triadic

Split comp.

Split comp.

Tints & Shades of #66F9DF

Lighter tints and darker shades built by moving the lightness channel while holding hue and saturation, which is what you want for hover states, backgrounds, and text variants.

Tints

Shades

Want a full 50-950 ramp with semantic roles? Generate design tokens from #66F9DF.

How #66F9DF Looks with Color Vision Deficiency

Simulated with the Viénot, Brettel & Mollon LMS projection model. Anomalous types are rendered as partial versions of the matching dichromacy, which is an approximation rather than a per-person clinical model.

Typical#66F9DF

Protanopia#E8E8DF

Protanomaly#C2EFDF

Deuteranopia#D7D7E2

Deuteranomaly#B5E5E1

Tritanopia#6FF6F6

Tritanomaly#6CF7ED

Achromatopsia#E2E2E2

Test a full palette in the color blindness simulator.

Using #66F9DF in Code

Copy-ready declarations for the places this color usually ends up.

CSS custom property--color-66f9df: #66F9DF;

CSS backgroundbackground-color: #66F9DF;

Tailwind configcolors: { 'color-66f9df': '#66F9DF' }

SwiftUIColor(red: 0.400, green: 0.976, blue: 0.875)

Android XML<color name="color_66f9df">#66F9DF</color>

SVG fillfill="#66F9DF"

More Green Colors

#66F9DF sits in the green family. These are its neighbours across that family's full range, each with its own breakdown.

000200 fdfff5 001f00 f7fee7 002400 f7fbf5 002c22 f5fffa 002e00 f5fff5 003300 f0fff0 008000 00db87 0d542b 20483f 33cc66 46c399 5ea500 728639 91e0b7 a3f5d8 bcd7bc d1ffed

#66F9DF Frequently Asked Questions

What color is #66F9DF?

#66F9DF is a light green — rgb(102, 249, 223) in RGB and hsl(169, 92%, 69%) in HSL. It carries no registered color name of its own; the closest named color is Aquamarine (#7FFFD4), which is clearly related but distinguishable side by side at a CIE76 distance of 9.41.

What is the RGB value of #66F9DF?

#66F9DF is rgb(102, 249, 223) — red 102, green 249, and blue 223 on the 0-255 scale.

What is the CMYK value of #66F9DF?

#66F9DF converts to approximately cmyk(59%, 0%, 10%, 2%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66F9DF be black or white?

Black text is the more readable choice. #66F9DF scores 1.3:1 against white and 16.18:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66F9DF as a CSS color keyword?

No. #66F9DF is not one of the CSS color keywords, so it has to be written as a hex, rgb() or hsl() value. The closest keyword is aquamarine (#7FFFD4) at a CIE76 distance of 9.41, which is clearly related but distinguishable side by side.

Open #66F9DF in a Tool

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Keep exploring: every green in the color library, the guide to shades of green, or the full color library.