With fast society its used for a single night out where they delete your group at the end of the day. We give the option to keep your groups by adding or editing group members freely. Group me is the closest competitor yet we can do what group me does at less than 1% of their cost.Beluga is used for smartphones whereas Sidaza can be used by any phone which includes the 70% of "dumbphone" users in America. Although Disco is similar to Sidaza, Sidaza supports picture messaging also which most if not all the others do not support.
We also wrote a blog post that goes over our major points without specifically addressing each competitor: