Qualifio is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Qualifio has better usage coverage in more websites categories. Including Arts & Entertainment, News & Media, Music & Audio, TV & Video and 33 other categories.
Slashdot Widget is leading in Internet & Telecom, Clothing, Religion & Spirituality, Games and 3 other categories.
Qualifio is leading in most countries, including France, Belgium, Spain, Netherlands and 12 other countries.
Slashdot Widget hasn't got a lead over Qualifio in any country.