iPhone Screenshots


RTTA, short for Real Time Tuning Analysis, is an innovative way to tune instruments and to analyze and improve your intonation. With a conventional instrument tuner, you play a single note, and the tuner indicates how well in tune that one note is. For variable pitch instruments like the flute, this can be deceiving. What is needed is a way to analyse the intonation of all notes in a piece of music or scale, as performed naturally. This is exactly what the RTTA technique provides.

Now, for the first time, the RTTA technique is available to iPhone users in the form of RTTATuner. Press the record button, and play a piece of music or some scales. RTTATuner will display the tuning of each note on a graph that is updated in real time. Choose from popular musical temperaments, or input custom temperaments. Select the pitch standard, temperament transition, display options, and note filters. Analyse your performance intonation or test the intonation of particular fixed and variable pitch instruments. Results can be exported to PDF for later reference.

RTTATuner will prove useful to all kinds of musicians and instrument makers. I hope you enjoy using it; please consider providing feedback on the app store!

Credits and Thanks:

The RTTA concept was invented by flutemaker and researcher Terry McGee, and was first put into practice by Graeme Roxburgh. See also Scott Turner's Windows application, Flutini, and the Tartini software developed by Philip McLeod and others at Otago University. Thanks go to all of the above.

The RTTATuner app was designed and developed by Dan Gordon.

What's New

Version 2.0

1. Export to PDF functionality added.
2. Sleep mode is suppressed during recording.
3. Cleaner look.
4. Rameau Tempérament Ordinaire added.
5. Improvements to statistics (more efficient, uses interquartile mean instead of mean).
6. Option to rate app in the app store.
7. Miscellaneous minor fixes and improvements.

Ratings and Reviews

A great practice tool!


For the student seriously working on their intonation, this tool is a necessity. It provides feedback over a longer period, say the length of a piece, instead of moment by moment as a meter does, This gives a huge advantage to those developing that all important relationship between the ear and the instrument. It should be in every flutist, recorder player, or ethnic flutist's tool box.

Excellent and useful


Performs as intended, within the limitations described on McGee's website and imposed by the iPhone mic. Useful both for evaluating instrument characteristics, and also consistency of the player's intonation control.

My only gripe: on a phone, the display is very small. I wish a version for iPad had been included.

Great app but has started crashing a lot under IOS 11.0


Great app but has started crashing a lot under IOS 11.0


Daniel Gordon
3.9 MB
Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2014 Dan Gordon


  • Family Sharing

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

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