Piano Tuner - Pro Tuning

Piano Tuner helps piano technicians measure inharmonicity, build custom stretch curves, and follow pitch in real time. Move from initial measurements through fine tuning, then save each piano's setup for your next visit.

REAL-TIME TUNING
Work across all 88 keys from A0 to C8. Use automatic note detection, manual selection or note lock. Read pitch deviation in cents alongside phase and spectrum displays.

STRETCH CURVES FOR EACH PIANO
Measure multiple notes to analyze the piano's inharmonicity and generate its stretch curve. Adjust the bass, middle and treble regions, or fine-tune individual note targets.

PITCH PREMEASUREMENT AND FINE TUNING
Premeasure the piano and record its current pitch deviations, then use the final tuning curve for fine tuning. This version supports premeasurement; overpull compensation and coarse tuning are not yet available.

MULTI-PARTIAL ANALYSIS AND TEMPERAMENTS
View pitch deviation for up to four partials at once, with a phase display for the selected partial. Adjust the A4 reference frequency, choose historical temperaments or create a custom temperament.

TUNING FILES
Save measurements, curves and notes for each piano. Reopen a saved setup for future work. Import and export tuning files through the Files app for backup and sharing.

REFERENCE TONES AND INPUT CALIBRATION
Play reference tones for note targets or selected partials. Calibrate the current audio input using an external reference with a known frequency.

BUILT FOR IPHONE AND IPAD
Use portrait or landscape layouts with light and dark modes. Audio is analyzed on your device, and tuning files are stored locally. Core tuning features work offline, with no account required.

FREE EVALUATION. ONE-TIME PRO UNLOCK.
Download for free to evaluate real-time tuning from C3 to C5 and create one editable evaluation file.
Unlock Pro with a one-time in-app purchase for all 88 keys, curve editing, pitch premeasurement, multi-partial analysis, reference tones, input calibration and multiple tuning files. No subscription.

Piano Tuner provides measurement and tuning guidance. It is intended for users with piano tuning knowledge and appropriate tuning tools.

1. This service is a subscription based paid service, which means you will prepay for future subscription usage. You can currently choose to use this service on a quarterly basis. At the end of each subscription period, your subscription will automatically renew by default, unless you cancel the automatic renewal yourself or we cancel the service.
2. Unsubscribe: To cancel the renewal, please cancel at least 24 hours in advance. You can unsubscribe by opening System Settings, clicking on Apple ID, clicking on Subscription, selecting Premium, and then unsubscribing.
3. Restore purchase: If you receive a prompt saying "You have already subscribed to this project" during the payment process and confirm that you have completed the purchase before, you can click "Restore Purchase" in the upper right corner to restore the pur