Nail the Pitch - Vocal Monitor is a free Android app developed by Autumn Rock Software Development. It is an excellent app for singers and musicians who want to monitor the notes they sing, test the range of their voice, and transcribe melodies. The app provides an ads-free experience that is not an autotune. It is a monitoring software that does not modify the audio in any way.

With the pro version, users can unlock additional features such as recording their vocal takes. They can freely scroll across a recorded vocal take and play it back at any point in the recording. Moreover, they can save and load past sessions and help support the future development of Nail the Pitch.

Overall, Nail the Pitch - Vocal Monitor is a great app for singers and musicians who want to improve their pitch and vocal range. The app is easy to use, and the features are well-designed. The pro version is worth considering if you are serious about improving your singing skills.