Usablenet is leading in Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Business & Industry, Shopping, Arts & Entertainment, Consumer Electronics and 29 other categories.
Zeta Search is leading in Internet & Telecom, Online Marketing, Career & Education, Finance and 13 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, France and 12 other countries.
Zeta Search is leading in Canada and India.