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 35 other categories.
Zeta Search is leading in Internet & Telecom, Finance, Online Marketing, Career & Education and 9 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, Canada and 10 other countries.
Zeta Search is leading in Colombia, India, Malta and Slovenia.