Bluemetrix is leading in Top 100K Sites and Top 1M Sites.
Bluemetrix has better usage coverage in more websites categories. Including Business & Industry, Real Estate, Shopping, Arts & Entertainment and 31 other categories.
Observer is leading in Computer & Electronics, People & Society, Software, Internet & Telecom and 12 other categories.
Bluemetrix is leading in most countries, including Japan, United Kingdom, United States, Ireland and 21 other countries.
Observer is leading in Spain, Poland, Australia and Finland.