Optimatic is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Six Apart Advertising has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, News & Media, Computer & Electronics and 52 other categories.
Optimatic is leading in Games, Internet & Telecom, Online, Video Games and 16 other categories.
Optimatic is leading in most countries, including United States, Argentina, Peru, India and 27 other countries.
Six Apart Advertising is leading in Netherlands, Austria, Nicaragua, Norway and 4 other countries.