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 38 other categories.
Usablenet is leading in Shopping, Clothing, Autos & Vehicles, Food & Drink and 17 other categories.
WebProspector is leading in most countries, including Germany, Austria, France, Netherlands and 11 other countries.
Usablenet is leading in United States, United Kingdom, Spain, Italy and 5 other countries.