Piano Tuner - High Precision

For the pianist, use the app to check the pitches of the piano and determine whether it needs to be tuned. For piano tuner, the app helps you to tune the piano. The app has 3-day trial. During the trial, you can tune every key of piano, experience full features. After the trial, you can only tune he middle C key(key 40). You can tune all keys after buying in-app purchase.