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, Sports, Consumer Electronics, Clothing and 13 other categories.
WebProspector is leading in most countries, including Germany, Austria, France, Italy and 11 other countries.
Usablenet is leading in United States, United Kingdom, Spain, Canada and 9 other countries.