OpinionLab is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
UpSellit has better usage coverage in more websites categories. Including Shopping, Adult, Business & Industry, Health and 78 other categories.
OpinionLab is leading in Travel, Tourism, People & Society, Transportation & Logistics and 25 other categories.
OpinionLab is leading in most countries, including United Kingdom, Russia, Australia, Germany and 42 other countries.
UpSellit is leading in United States, Canada, Netherlands, South Africa and 9 other countries.