In terms of market share, Observer is clearly lagging behind, losing to WebProspector in all segments.
WebProspector has better usage coverage in more websites categories. Including Business & Industry, Internet & Telecom, Marketing & Advertising, Computer & Electronics and 36 other categories.
Observer is leading in People & Society, Photography, Programming, Real Estate and 8 other categories.
WebProspector is leading in most countries, including Germany, Austria, United Kingdom, France and 12 other countries.
Observer is leading in United States, Russia, Canada, Netherlands and 6 other countries.