Pocket Pitch has a lot of benefits to it, which is why it is also a very popular app. This app is available on both Android and iOS devices. You can use this app to warm up before an a cappella performance, help make improvements to your pitch, and help you with notes.
If you do not have a piano around, this is the best app that you can use to find the right notes. It can even help you get better at identifying notes. For all of these uses, this is a great app for all singers.