In terms of market share, ReferLocal is clearly lagging behind, losing to Simple AdServer in all segments.
ReferLocal has better usage coverage in more websites categories. Including Business & Industry, News & Media, People & Society, Travel and 6 other categories.
Simple AdServer is leading in Computer & Electronics, Adult, Autos & Vehicles, Motorsports and 5 other categories.
Simple AdServer is leading in most countries, including Hungary, Russia, Brazil and United Kingdom.
ReferLocal is leading in United States, Austria and Netherlands.