Usablenet is leading in Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Business & Industry, Shopping, Accommodation & Hotels, Travel and 28 other categories.
Zeta Search is leading in Finance, Internet & Telecom, Health, Online Marketing and 12 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Italy, Canada and 11 other countries.
Zeta Search is leading in Austria, Philippines and Ukraine.