Piano Tuner - High Precision is an iPhone app designed for pianists and piano tuners alike. With this app, pianists can check the pitches of their piano and determine whether it needs to be tuned. For piano tuners, the app provides a convenient tool for tuning the piano accurately.

The app offers a 3-day trial period during which users can tune every key on the piano and experience all the features of the app. This trial period allows users to fully explore the app's capabilities and determine if it meets their needs. After the trial period, users are limited to tuning the middle C key (key 40) unless they make an in-app purchase.

Piano Tuner - High Precision provides a user-friendly interface and high precision tuning capabilities, making it a valuable tool for both pianists and piano tuners. Whether you need to check the pitches of your piano or fine-tune it to perfection, this app has you covered.