Barbershop
The author of the apps at DepollSoft, David Poll, is a software engineer who is also passionate about barbershop and a cappella music. David is a card-carrying member of the Barbershop Harmony Society and is happy to be able to provide tools for fellow musicians to use for free on their smart devices.
David sings Lead with Voices in Harmony (Bay Area Chapter of the BHS), a chorus out of the San Jose area, and with his quartet, Some Friends of Mine.
Pitch Pefect - A free digital pitch pipe for your smart device!