Design tests come in two packages: Sample and Complete.
Sample design tests include screenshots from one or two email clients and do not cost anything to run.
Complete design tests include screenshots from over 30 of the most popular email clients, including Gmail, Outlook, iPhone Mail, Yahoo Mail, and more. There are no recurring charges for Design Tests. You simply purchase one when you need one. For the most up-to-date pricing, please open the Design Test window in Direct Mail (choose Message > Design Test from the menu bar).