Usablenet is leading in Top 100K Sites and Top 1M Sites.
Zeta Search has better usage coverage in more websites categories. Including Finance, Internet & Telecom, Health, People & Society and 18 other categories.
Usablenet is leading in Shopping, Business & Industry, Clothing, Consumer Electronics and 17 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Italy, Spain and 7 other countries.
Zeta Search is leading in Canada and Philippines.