Erhu Tuner is a free tuning application developed by TrueStudio for Android devices. This app is designed to help Erhu players tune their instrument easily and accurately. The app uses the device's microphone to analyze the sound in real-time and recognize which string is being played. It then indicates whether the string is too high or too low, making it easier for players to get their instrument in tune.

In addition to automatic mode, the app also has a manual mode. Users can press the buttons of a specific string on the app to switch to manual mode, and then they can tune only the selected string. If the user gets the string in tune, they can then press the next button and tune the next string. This feature can be particularly helpful for players who need to fine-tune their instrument or who prefer to tune one string at a time. Overall, Erhu Tuner is a useful app for Erhu players who want to keep their instrument in tune.