Cool, but a couple of days ago I used [another Android app](https://play.google.com/store/apps/details?id=com.floriandra...) that does the same thing, even with a cross-plattform Java server, too. Is there anything different with this one (except the price)?
(gnirehtet author here)
I guess that they use the same principles (though I can't check easily since it's proprietary). In that case, the main difference is that gnirehtet is free and open source software.