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 31 other categories.
SimilarWeb Website Visits is leading in Internet & Telecom, Search Engine, Tourism, Travel and 21 other categories.
Opta Widget is leading in most countries, including Spain, United Kingdom, Italy, Australia and 40 other countries.
SimilarWeb Website Visits is leading in Russia, India, Poland, Ukraine and 15 other countries.