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 134 other categories.
APSIS is leading in Science, Social Sciences, Financial Management, Chemicals and 17 other categories.
iContact is leading in most countries, including United States, United Kingdom, Canada, India and 61 other countries.
APSIS is leading in Sweden, Denmark, Norway, Finland and 13 other countries.