TuneLab Piano Tuner 4+

Real-Time Specialties

    • 4.8 • 72 Ratings
    • $299.99



This app is for professional piano technicians. This is a professional tool that produces a custom piano tuning for any piano. It is part of the TuneLab line of piano tuning programs for smartphones, tablet computers and laptops that piano technicians have been using sine 2001.

Notable features:

* 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 by specifying different intervals for the bass, the treble, and the mid-range of the scale. These intervals can be octaves, 12ths, double octaves, etc. Good defaults are in place if you are not sure which settings you prefer.

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 strobe-like Phase Display. This is a band where black squares move left or right depending on whether the note is sharp or flat. Tune the note to make the pattern stop moving. The other is the Spectrum Display. This is a graph of the frequency spectrum around the desired note that shows a peak in the audio frequency spectrum for every pitch present in the sound. The object in using this display is to tune the note until the peak in the graph is positioned at a central red line. The Spectrum Display makes it possible to do a rough pitch-raise 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 4.7.1

Fixed a bug so that prevented auto note switching from taking the offset into account. In addition there are these changes from version 4.7:

* Adjustable update rate for the Spectrum Display - up to 10 updates per second.
* More reliable and sensitive Auto-All automatic note switching.
* Option to auto-note switch only on the attack portion of the sound rather than the sustain portion to reduce instances of switching to the wrong note.
* Phase Display speed is now a logarithmic function of the tuning error rather than linear. This gives more resolution very near to the tuning target plus more range when far from the tuning target.
* Faster and more precise Inharmonicity measurements (3 seconds max instead of 6 seconds max).
* Accuracy and speed of the Locking operation is improved.
* Removal of obsolete creation of "split-scale" tunings. Loading of previously saved "split-scale" tunings is still supported.
* Removal of obsolete manual adjustment of non 3-part tuning curves. Use 3-part tuning instead.

Ratings and Reviews

4.8 out of 5
72 Ratings

72 Ratings

Longmont CO ,

Extremely Useful

I started tuning my pianos a couple years ago (m&h aa, yamaha c5) and this tool has helped me immensely! Calculating the stretch and inharmonicity really helped me have a solid starting point to work from. In addition the phase display has helped my aural tuning by providing visual feedback to what I hear.
I'm not a pro and I'm sure I don't take advantage of all its features but as an amateur this too is indispensible!
My pianos sound better than they ever had and I learned loads of great acoustic theory in the process. Well done!

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.

Pianotunerman ,

Robert Treadway

I've been using Tunelab for the IPhone for about two decades now and am very pleased with it. I have also used the more expensive programs out there and tho they are good they are not better quality. Also, Tunelab has good support if you have any questions. Try that with Cybertuner(they want you to pay extra for any help). I recommend Tunelab over the others in price and equal quality of product.

App Privacy

The developer, Real-Time Specialties, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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