Here is a song based app that you can carry in your IPhone or Android. You can write actual complete songs on your phone with this super cool application.
This is a really useful tool for songwriters who and want to hear how different chords sound together and don’t have their guitar or their piano . 60 chord types are included along with 16 time signatures from basic 4/4 and 3/4 to more complicated 11/4 and 15/4 signatures.
There’s also an automatic song generator to get you started which will create songs in many different styles. Four songs that have already created are in the app to give you an idea of what you can do.
There are free versions of Chordbot available for both platforms, which give you access all of the chords and signatures, but don’t allow you to export tracks or use the auto song generator.