Usablenet is leading in Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Shopping, Business & Industry, Food & Drink, Food & Grocery Retailers and 31 other categories.
Zeta Search is leading in Internet & Telecom, Finance, Online Marketing, Career & Education and 12 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, Italy and 12 other countries.
Zeta Search is leading in Afghanistan, Oman and South Africa.