Do not buy this app unless you are a professional piano technician. This is a professional tool that produces a custom piano tuning for any piano. It is part of our popular TuneLab line of piano tuning programs for Smartphones, tablet computers, and laptops which piano technicians have been using sine 2001.

Notable features:

* Capable of an accuracy to 0.02 cents.
* Measures and uses inharmonicity of the piano to construct a custom tuning.
* Provides an over-pull mode for more accurate pitch-raises.
* Can store hundreds of tuning files for individual pianos.
* Tuning files can be stored locally and in the Cloud on Dropbox.
* Provides many historical temperaments for period music.
* Switches notes automatically when you play the next note.
* Provides a strobe-like Phase Display for fine-tuning.
* Provides a versatile frequency spectrum display.

TuneLab lets you customize a tuning by sampling the inharmonicity for a few notes of the particular piano. You can choose the kind of tuning stretch you want, based on octaves, 12ths, double-octaves, or other intervals. Good defaults are in place if you are not sure which settings you prefer. Then you start tuning.

After a custom tuning has been created from inharmonicity measurements you can store this tuning by name. The next time you need to tune that piano, or one very much like it, you simply load that same tuning file and start tuning. There is essentially no limit to the number of tuning files that you can store. TuneLab comes with some sample tuning files and an "Average" tuning file so you can start tuning right away without bothering to measure inharmonicity.

TuneLab covers the normal piano range from A0 to C8 (88 notes). The automatic note-switching feature makes it possible to enjoy hands-free operation. There is also easy one-touch manual note switching.

TuneLab has two different displays that are visible at the same time. One is the Phase Display. This is a band where black squares move left or right. The object in tuning is to make the squares stop moving. The other is a Spectrum Display. This is a graph that shows a peak in the audio frequency spectrum for every pitch present in the sound. The object here is to tune so as to place the peak in the graph at a central red line. The spectrum display makes it possible to do rough tuning without mutes, since each string of a unison produces its own peak in the graph. Having both the Phase Display and the Spectrum Display visible at the same time gives you a more complete picture of the tuning than any single spinner-type or needle-type display.

What’s New

Version 4.4

* A new tuning curve generation method called "3-part tuning" provides the means to specify the kind of interval that should be beatless at three separate places in the scale: bass, treble, and middle.
* "Auto-all" note switching mode will now switch automatically from any note to any other note.

Ratings and Reviews

4.4 out of 5
10 Ratings

10 Ratings

jmMusician ,

Amazing - but a few requests

This app is great. It sets a beautiful temperament, stretches the piano quite nicely, and you get smooth progressions of all intervals of increasing beat rates as you go up the piano. The over pull feature works well. I had been using the free Entropy Piano Tuner app for awhile, and it got to the point where my ear could set a better temperament than it did, so I invested in TuneLab. I have been happy ever since. Very good for the price. Be sure to read the user manual before using, though.

Just a few requests:
Better UI. The app works beautifully, but it doesen't look very beautiful. A little prettier please!
Other cloud support. Dropbox works well, but I would love to be able to save my tuning files to OneDrive, my primary cloud storage source. Google drive, iCloud Drive, OneDrive support needed for greater flexibility.

TJArm ,

For Professional Use

I am a long time “by ear only” professional piano technician who started using TuneLab a decade ago just for experimenting. This is not a “do it yourself” tuning app for pianos. It is an excellent measuring tool for real piano technicians who already understand the fundamentals of piano tuning. Everyone has their preferences, but it is in the same league as Verituner and CyberTuner, other pro apps in the pricing stratosphere. It is especially useful for pitch raising and tuning in noisy environments. I recommend it.

Asdf75 ,

Great app

I’ve been using TuneLab for about 15 years of my 40 year piano tuning career. I have some of the more expensive apps, but have come to sure TL more than the others because of its simplicity. It’s great for pitch raises also. I recommend it.


Real-Time Specialties, inc.
29.6 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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