Market Share by Top Websites

1 Nielsen NetRatings is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 Despite its recent growth, Act-On is still behind Nielsen NetRatings in all market share segments.

Websites Categories

1 Nielsen NetRatings has better usage coverage in more websites categories. Including Business & Industry, Marketing & Advertising, Arts & Entertainment, Food & Drink and 202 other categories.

2 Act-On is leading in Software, Business Services, Insurance, Universities & Colleges and 17 other categories.


1 Nielsen NetRatings is leading in most countries, including Italy, Australia, Spain, Bulgaria and 124 other countries.

2 Act-On is leading in United States, Canada, Netherlands, Israel and 22 other countries.