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, Pets & Animals and 47 other categories.
Marktest is leading in Newspapers.
YellowTracker is leading in most countries, including Netherlands, Belgium, United States, Germany and 10 other countries.
Marktest is leading in Portugal.