Google Website Optimizer is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Google Website Optimizer has better usage coverage in more websites categories. Including Business & Industry, People & Society, Arts & Entertainment, Computer & Electronics and 44 other categories.
Rekko is leading in Shopping, Clothing, Health, Food & Drink and 22 other categories.
Google Website Optimizer is leading in most countries, including India, Germany, Brazil, Poland and 23 other countries.
Rekko is leading in United States, Cuba, Austria and Tanzania.