Usablenet is leading in Top 100K Sites.
WebProspector has better usage coverage in more websites categories. Including Business & Industry, Internet & Telecom, Marketing & Advertising, Computer & Electronics and 38 other categories.
Usablenet is leading in Shopping, Clothing, Consumer Electronics, Home & Garden and 10 other categories.
WebProspector is leading in most countries, including Germany, Austria, Russia, Poland and 12 other countries.
Usablenet is leading in United States, United Kingdom, Italy, Spain and 5 other countries.