APSIS is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
iContact has better usage coverage in more websites categories. Including Business & Industry, People & Society, Arts & Entertainment, Shopping and 118 other categories.
APSIS is leading in Science, Marketing & Advertising, Social Sciences, Travel and 43 other categories.
iContact is leading in most countries, including United States, United Kingdom, Canada, Australia and 49 other countries.
APSIS is leading in Sweden, Denmark, Norway, Finland and 25 other countries.