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, News & Media, People & Society, TV & Video and 28 other categories.
Optimatic is leading in Games, Food & Drink, Cooking & Recipes, Online and 15 other categories.
Tremor Media is leading in most countries, including United States, Germany, United Kingdom, Japan and 16 other countries.
Optimatic is leading in Canada, Israel, Algeria, Poland and 4 other countries.