OpinionLab is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Slice Factory has better usage coverage in more websites categories. Including People & Society, Arts & Entertainment, Computer & Electronics, Software and 53 other categories.
OpinionLab is leading in Business & Industry, Travel, Tourism, Shopping and 43 other categories.
OpinionLab is leading in most countries, including United States, United Kingdom, Canada, Russia and 46 other countries.
Slice Factory is leading in India, France, Sri Lanka, Chile and 13 other countries.