Importing iOS style songs
OpenSongApp is only for Android. If you work with musicians who use song book apps on iOS, you can still import songs from them (and export your songs to them) with this app.
The iOS songs are just a modified chordpro song with some additional information. The file will extension often has the name of the app. You can also use a backup file from that software (it helpfully ends with the file extension .backup) and import it into my app.
Also, if you decide my app isn't for you and you're moving to iOS, no problem, you can also save your songs into this format for later importing into whatever software you want to use. It's your choice. I respect that.
To import these files, open them on your device using OpenSongApp and it will take care of the rest.