#66FF99 Color

#66FF99 is rgb(102, 255, 153) in RGB, hsl(140, 100%, 70%) in HSL, and about cmyk(60%, 0%, 40%, 0%) in CMYK. It has no registered color name of its own — the closest is Very Light Malachite Green (#64E986), clearly related but distinguishable side by side at ΔE 8.4. Black text is the more readable choice on this background.

#66FF99

HEX#66FF99

RGBrgb(102, 255, 153)

HSLhsl(140, 100%, 70%)

HSVhsv(140, 60%, 100%)

CMYKcmyk(60%, 0%, 40%, 0%)

OKLCHoklch(89.4% 0.192 151.4)

LABlab(90.13% -58.81 36.16)

LCHlch(90.13% 69.04 148.42)

What #66FF99 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 #66FF99, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Very Light Malachite Green#64E986ΔE 8.4 Medium Spring Green#00FA9AΔE 10.37 Mint#98FF98ΔE 12.96 Android Green#3DDC84ΔE 12.98 Pale Green#98FB98ΔE 14.1 Light Green#90EE90ΔE 16.18

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

#66FF99 Channel Values

How #66FF99 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 255 · B 153	8-bit channels as sent to the display
HSL	H 140° · S 100% · L 70%	Easiest model for building lighter and darker variants
HSV	H 140° · S 60% · V 100%	Matches the picker in most design tools
CMYK	C 60% · M 0% · Y 40% · K 0%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	1.29:1 vs white · 16.33:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66FF99 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 text1.29:1AA normal AA large AAA normal

TextBlack text16.33:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66FF99 in the contrast checker.

Colors That Go With #66FF99

Pairings derived from color-wheel relationships. The complementary color sits opposite #66FF99; 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 #66FF99

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 #66FF99.

How #66FF99 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#66FF99

Protanopia#EEEE9A

Protanomaly#C6F59A

Deuteranopia#DCDC9E

Deuteranomaly#B8EB9C

Tritanopia#81F5F5

Tritanomaly#77F9D6

Achromatopsia#E3E3E3

Test a full palette in the color blindness simulator.

Using #66FF99 in Code

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

CSS custom property--color-66ff99: #66FF99;

CSS backgroundbackground-color: #66FF99;

Tailwind configcolors: { 'color-66ff99': '#66FF99' }

SwiftUIColor(red: 0.400, green: 1.000, blue: 0.600)

Android XML<color name="color_66ff99">#66FF99</color>

SVG fillfill="#66FF99"

More Green Colors

#66FF99 sits in the green family. These are its neighbours across that family's full range, each with its own breakdown.

66ffc4 66ff66 66ffcc 66ff33 679267 66ff00 6b8e23 66cdaa 6bb300 66cc99 6bdb6b 66cc66 88e288 9bff05 b0f3b0 ccff66 e4ffbd 005700 00a550 016630 182108 2a3517 38ff38 4ed44e

#66FF99 Frequently Asked Questions

What color is #66FF99?

#66FF99 is a light green — rgb(102, 255, 153) in RGB and hsl(140, 100%, 70%) in HSL. It carries no registered color name of its own; the closest named color is Very Light Malachite Green (#64E986), which is clearly related but distinguishable side by side at a CIE76 distance of 8.4.

What is the RGB value of #66FF99?

#66FF99 is rgb(102, 255, 153) — red 102, green 255, and blue 153 on the 0-255 scale.

What is the CMYK value of #66FF99?

#66FF99 converts to approximately cmyk(60%, 0%, 40%, 0%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66FF99 be black or white?

Black text is the more readable choice. #66FF99 scores 1.29:1 against white and 16.33:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66FF99 as a CSS color keyword?

No. #66FF99 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 mediumspringgreen (#00FA9A) at a CIE76 distance of 10.37, which is visibly different.

Open #66FF99 in a Tool

Hex to RGB Hex to HSL Hex to CMYK Hex to OKLCH Hex to Pantone Build a palette Make a gradient

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