When comparing Unison vs GroupMe, the Slant community recommends GroupMe for most people. In the question“What is the best team chat software?” GroupMe is ranked 49th while Unison is ranked 70th. The most important reason people chose GroupMe is:
GroupMe has a built in function to read receipts.
Specs
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Pros
Pro Notifies via mentions
It's possible to @user or @all to alert a specific user or everyone in a room, respectively.
Pro Full end-to-end encryption
Pro Native apps for iOS and Android
In addition to being available on the web, Unison has native iOS and Android applications.
Pro Shows who has read each post
Pro Built-in support for video conferencing
Video calls are a single click away.
Pro Reads receipts
GroupMe has a built in function to read receipts.
Pro Great web client
GroupMe has an excellent web client that can be used to send and receive messages and manage groups from the desktop.
Pro IFTTT Integration
Allows sending messages from web services via IFTTT.
Pro Integrated calendar
It's possible to add location and time with reminders directly in the GroupMe app.
Pro Makes it easy to silence 1 or all groups
GroupMe has settings that allow muting a single group or turn off all GroupMe notifications from within the app.
Pro Does not require everyone in the group to have a smartphone
GroupMe can set up a custom phone number which allows people without the App to send and receive messages. This makes it easy to add anyone to messaging.
Cons
Con Lacks wehbooks & services integration
Con Drains battery fast
GroupMe, in order to have a constant connection which allows for notifications drains the battery of a device quickly, which is not ideal for a messaging app that one needs on time notifications from.