Usablenet is leading in Top 100K Sites.
WebProspector has better usage coverage in more websites categories. Including Business & Industry, Internet & Telecom, Marketing & Advertising, Arts & Entertainment and 41 other categories.
Usablenet is leading in Shopping, Clothing, Consumer Electronics, Mobile Developers and 6 other categories.
WebProspector is leading in most countries, including Germany, Austria, France, Switzerland and 13 other countries.
Usablenet is leading in United States, United Kingdom, Spain, Chile and 8 other countries.