eProof is leading in Top 10K Sites and Top 100K Sites.
Observer has better usage coverage in more websites categories. Including Business & Industry, Computer & Electronics, Arts & Entertainment, Internet & Telecom and 28 other categories.
eProof is leading in Accounting and Finance.
Observer is leading in most countries, including Russia, United Kingdom, Ukraine, Brazil and 10 other countries.
eProof hasn't got a lead over Observer in any country.