When comparing GroupMe vs Brosix, the Slant community recommends GroupMe for most people. In the question“What is the best team chat software?” GroupMe is ranked 49th while Brosix is ranked 51st. The most important reason people chose GroupMe is:
GroupMe has a built in function to read receipts.
Specs
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Pros

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.
Pro Excellent solution for companies who would like to encrypt their office communication
Brosix uses strong 256-bit encryption that secures ALL communication channels.
Pro Brosix is available on all platforms
This includes Android, iOS, Linux, Windows, Mac.
Pro Easy to use
Brosix IM facilitates the internal communication and increases office productivity.
Pro Affordable
For $1.70 per user per month voice & video chat, screen-sharing sessions, send unlimited files regardless of the size, etc.
Pro Great admin tools
The Enterprise version of Brosix allows the Administrator to manage their own and unique network. The Admin has also full-control over the archives of all chats within the network.
Pro Easy to use
Cons
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.
Con Not enough Admin controls
Con Poor mobile version
The mobile version of the application contains only a few of the features that the Desktop client has.
