#66CC99 Color

#66CC99 is rgb(102, 204, 153) in RGB, hsl(150, 50%, 60%) in HSL, and about cmyk(50%, 0%, 25%, 20%) in CMYK. It has no registered color name of its own — the closest is Medium Aquamarine (#66CDAA), clearly related but distinguishable side by side at ΔE 8.49. Black text is the more readable choice on this background.

#66CC99

HEX#66CC99

RGBrgb(102, 204, 153)

HSLhsl(150, 50%, 60%)

HSVhsv(150, 50%, 80%)

CMYKcmyk(50%, 0%, 25%, 20%)

OKLCHoklch(77% 0.122 159.8)

LABlab(74.94% -40.09 15.98)

LCHlch(74.94% 43.16 158.27)

What #66CC99 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 #66CC99, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Medium Aquamarine#66CDAAΔE 8.49 Eucalyptus#44D7A8ΔE 10.13 Mountain Meadow#30BA8FΔE 10.38 Zeal#91E0B7ΔE 12.26 Teal Deer#99E6B3ΔE 12.78 Seafoam#93E9BEΔE 13.08

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

#66CC99 Channel Values

How #66CC99 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 204 · B 153	8-bit channels as sent to the display
HSL	H 150° · S 50% · L 60%	Easiest model for building lighter and darker variants
HSV	H 150° · S 50% · V 80%	Matches the picker in most design tools
CMYK	C 50% · M 0% · Y 25% · K 20%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	1.97:1 vs white · 10.66:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66CC99 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 text1.97:1AA normal AA large AAA normal

TextBlack text10.66:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66CC99 in the contrast checker.

Colors That Go With #66CC99

Pairings derived from color-wheel relationships. The complementary color sits opposite #66CC99; 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 #66CC99

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 #66CC99.

How #66CC99 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#66CC99

Protanopia#BFBF99

Protanomaly#A3C599

Deuteranopia#B3B39C

Deuteranomaly#9ABD9B

Tritanopia#72C6C6

Tritanomaly#6EC9B6

Achromatopsia#B9B9B9

Test a full palette in the color blindness simulator.

Using #66CC99 in Code

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

CSS custom property--color-66cc99: #66CC99;

CSS backgroundbackground-color: #66CC99;

Tailwind configcolors: { 'color-66cc99': '#66CC99' }

SwiftUIColor(red: 0.400, green: 0.800, blue: 0.600)

Android XML<color name="color_66cc99">#66CC99</color>

SVG fillfill="#66CC99"

More Green Colors

#66CC99 sits in the green family. These are its neighbours across that family's full range, each with its own breakdown.

66cdaa 66cc66 66ff00 66cc33 66ff33 66cc00 66ff66 66b032 66ff99 669966 66ffc4 669933 86c8bc 99ff99 adff2f caf7ca deefbd 004700 009b7d 00ff99 171c0c 28774a 35530e 4cbb17

#66CC99 Frequently Asked Questions

What color is #66CC99?

#66CC99 is a light green — rgb(102, 204, 153) in RGB and hsl(150, 50%, 60%) in HSL. It carries no registered color name of its own; the closest named color is Medium Aquamarine (#66CDAA), which is clearly related but distinguishable side by side at a CIE76 distance of 8.49.

What is the RGB value of #66CC99?

#66CC99 is rgb(102, 204, 153) — red 102, green 204, and blue 153 on the 0-255 scale.

What is the CMYK value of #66CC99?

#66CC99 converts to approximately cmyk(50%, 0%, 25%, 20%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66CC99 be black or white?

Black text is the more readable choice. #66CC99 scores 1.97:1 against white and 10.66:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66CC99 as a CSS color keyword?

No. #66CC99 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 mediumaquamarine (#66CDAA) at a CIE76 distance of 8.49, which is clearly related but distinguishable side by side.

Open #66CC99 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.