Its good, but could be better.

Whatd make this app the best it could be is if you could fully customize your preferred singing range from one exact note to another. Right now, it just has standard range categories; Bass, Tenor, etc. Also, if it allowed you to do modes or build exotic scales. There are only twelve notes, why not let users choose which notes, that way if they want to sing modes they can? Otherwise good app. Use it regularly, and it WILL help you sing better.

filmkicks about Singing Vocal Warm Ups - Singer's Friend, v1.4