Optimatic is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Tremor Media has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, Music & Audio, Movies and 25 other categories.
Optimatic is leading in Games, News & Media, Business & Industry, Internet & Telecom and 18 other categories.
Optimatic is leading in most countries, including United States, Peru, Canada, United Kingdom and 24 other countries.
Tremor Media is leading in Germany, Brazil, Ukraine, Ghana and 5 other countries.