Usablenet is leading in Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Shopping, Business & Industry, Consumer Electronics, Sports and 33 other categories.
Zeta Search is leading in Internet & Telecom, People & Society, Online Marketing, Finance and 14 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, Italy and 6 other countries.
Zeta Search is leading in United Arab Emirates, Thailand and Armenia.