InverText is a single function app: It will flip the text of anything you copy and paste or type in to read backwards. There are no additional features, no sharing options, no way to save or export. It basically flips the text around -- a function that can be performed relatively easily with a couple of lines of code. With its limited functionality, it's hard to see how this app could prove to be very useful for most users.
After opening the app, you'll find a single text line input and a button. Either type in or paste the text of your choice and then tap the button to flip it around. Again, InverText doesn't offer any other options, tools, or settings, so that's all you're able to do with InverText. This could be a cool app for two users with the same app -- essentially sending lightly-coded messages back and forth between devices. But otherwise, it has fairly limited uses and the developer hasn't included anything that expands that usability.
If you need an app that can flip the text around in a sentence or line of text, then InverText will get the job done, but that's all it has to offer and that limits its overall usefulness.