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, Sports, Travel, Shopping and 28 other categories.
SelectMedia is leading in Education and Career & Education.
Celtra is leading in most countries, including United States, United Kingdom, Germany, Mexico and 15 other countries.
SelectMedia is leading in Indonesia.