Celtra is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Celtra has better usage coverage in more websites categories. Including News & Media, Military & Defense, Law & Government, Business & Industry and 25 other categories.
SelectMedia is leading in Career & Education and Education.
Celtra is leading in most countries, including United States, United Kingdom, Germany, Colombia and 19 other countries.
SelectMedia is leading in Canada, Japan, Netherlands, Pakistan and 4 other countries.