Optimost is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Optimost has better usage coverage in more websites categories. Including People & Society, Finance, Business & Industry, Insurance and 59 other categories.
Zeta Search is leading in Equestrian, Business Services and Alternative & Natural Medicine.
Optimost is leading in most countries, including United States, United Kingdom, France, Japan and 34 other countries.
Zeta Search is leading in Malta and Slovenia.