Opta Widget is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Opta Widget has better usage coverage in more websites categories. Including Sports, Soccer, News & Media, Arts & Entertainment and 35 other categories.
SimilarWeb Website Visits is leading in Internet & Telecom, Search Engine, Tourism, Travel and 19 other categories.
Opta Widget is leading in most countries, including Spain, United Kingdom, Italy, United States and 44 other countries.
SimilarWeb Website Visits is leading in Russia, Japan, India, Poland and 12 other countries.