Usablenet is leading in Top 100K Sites and Top 1M Sites.
WebProspector has better usage coverage in more websites categories. Including Business & Industry, Internet & Telecom, Marketing & Advertising, Computer & Electronics and 35 other categories.
Usablenet is leading in Shopping, Consumer Electronics, Recreation & Hobbies, Clothing and 25 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, Italy and 10 other countries.
WebProspector is leading in Germany, Austria, France, Thailand and 4 other countries.