The True Voice Vocal Metronome offers a wide variety of rhythms:

- quarter
- eight
- sixteenth
- triplet

Works in 3/4 and 4/4 time signature.
You can mute a particular sound by taping the rhythm chain at the top. You can also accentuate a given sound by tapping it again.
Intro function allows you to choose intro beats.
Timer helps you set a desired number of bars that the app will play.
You can also choose to play a regular metronome sound in the background. Those sounds will play even if you mute certain vocals.