Marktest is leading in Top 10K Sites and Top 100K Sites.
YellowTracker has better usage coverage in more websites categories. Including Business & Industry, Arts & Entertainment, People & Society, News & Media and 80 other categories.
Marktest is leading in Newspapers.
YellowTracker is leading in most countries, including Netherlands, Belgium, United States, United Kingdom and 18 other countries.
Marktest is leading in Portugal and Brazil.