Venabili Metronome - Normal metronome that also has advanced features such as polyrhythms, changing time bars, accelerando and ritardando. Sequences of changing time bars can be saved in the phone itself or shared on the web for easy use of all in your band, orchestra or chambermusic group.
It easily does e.g. 7/8 with grouping of 2+2+3 or any combination you need.
It will also enable you to make a playlist for a concert
Instruction manual can be downloaded from www.venabili.com as well as demonstration video of the changing time bar feature