Usablenet is leading in Top 10K Sites, 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 37 other categories.
Usablenet is leading in Shopping, Travel, Accommodation & Hotels, Clothing and 22 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Italy, Japan and 10 other countries.
WebProspector is leading in Germany, Austria, Belgium, Netherlands and 8 other countries.