Riddle is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Riddle has better usage coverage in more websites categories. Including Business & Industry, News & Media, Career & Education, Education and 66 other categories.
Zimbio is leading in Arts & Entertainment, People & Society, Music & Audio, Humor and 29 other categories.
Riddle is leading in most countries, including United States, United Kingdom, Germany, France and 41 other countries.
Zimbio is leading in Sweden, Philippines, Bulgaria, Czech Republic and 6 other countries.