Blueshift is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Observer has better usage coverage in more websites categories. Including Business & Industry, Arts & Entertainment, Computer & Electronics, People & Society and 24 other categories.
Blueshift is leading in Search Engine and Shopping.
Observer is leading in most countries, including United States, Russia, Japan, Germany and 7 other countries.
Blueshift is leading in India and United Kingdom.