Usablenet is leading in Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Shopping, Business & Industry, Clothing, Consumer Electronics and 19 other categories.
Zeta Search is leading in Finance, Internet & Telecom, Health, People & Society and 17 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Italy, Spain and 5 other countries.
Zeta Search is leading in India, Philippines and Brazil.