The difference between Text Buddy and your regular text application is in the availability and the process of sending messages. The software is available for installation on Windows PCs and it claims that it allows users to send Free SMS messages to anywhere in the world at 0 cost. You on the other side, might have to pay to do the same or if you're an unlimited plan, there is no advantage.
Also the text message app on your phone might run on iOS, Android, Windows Phone, etc while this is exclusively for Windows PCs.
