Usablenet is leading in Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Business & Industry, Shopping, Clothing, Sports and 25 other categories.
w3roi is leading in Internet & Telecom, Computer & Electronics, Health, Career & Education and 25 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, India and 10 other countries.
w3roi is leading in China, Brazil, Canada, Nicaragua and 3 other countries.