A free app for Android, by TarrySoft.

A free app for musicians to tune their violin, with both beginner and expert-level functionality. The app uses the built-in microphone of your device to analyze the sound and then provides the current note played, as well as the frequency. Musicians can then choose to either play the note or listen to how it sounds.

The app also has a built-in tuner, which is used to tune a violin without having to touch the screen. It is very simple, easy to use, and works on both beginner and expert levels.

Musicians will also be able to use the app to learn how to tune their violin, as it also includes a built-in tutorial, which provides information on how to do so.