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Precision Strobe Tuner Lite

By Jim Campbell

This app is only available on the App Store for iOS devices.


Precision Strobe Tuner Lite 1.62

A General Purpose Chromatic Musical Instrument Tuner App with special Piano Tuning Functions.

The Precision Strobe Tuner main screen features are the Spectrum Display, the Note Dial and the Strobe Display.

The central Spectrum Display shows the input spectrum wrapped around the Display, with each Octave drawn in a separate color. The Note Dial is marked like a clock with the twelve notes of the Scale. All overtones of the input are shown as peaks in the Spectrum Display pointing towards their corresponding Notes. The Fundamental Indicator Tic on the Spectrum Display shows the Note of the Fundamental along the Note Dial, with the color designating the Octave. Use the Spectrum Display for coarse adjustment by tuning the Fundamental to the center of the desired Note Indicator.

As the input approaches the desired Note, a Two Group pinwheel pattern becomes visible rotating in the Strobe Display. Fine tuning is accomplished by adjusting to stop rotation. The Strobe Display responds instantaneously to changes in pitch and is extremely sensitive. The outside Strobe Display works just like a classic rotating disk strobe tuner. The Two Group pattern rotates CCW when the input is flat, and CW when sharp. When the rotation is stopped, the note is in tune.

The first screen shot shows the display tuning a Guitar Low E string. The Fundamental appears as an Orange peak in the Spectrum Display. This string rings bright, so the overtones are also dominant in the Display. Several other screenshots show the display for other Guitar Strings.

The second screenshot shows the display for an E 440 Tuning Fork with the Calibration Dial enabled and set. This Fork is 1.3 cent Flat.

The third screenshot shows the Input Signal Scope/Spectrum Display Page.

The PST also includes a Programable Temperament Function with 5 user definable banks. The final screenshot shows an example of a Temperament Bank setup to a typical Piano Stretch Curve. This can also be used for tuning alternate temperaments, pedal steel guitar setups, or special guitar intonation systems.

In addition, there are several Special Measurement Banks used for String Inharmonicity characterization and Piano Stretch Curve Calculation. Individual strings are characterized by measuring the Fundamental and 2nd Harmonic separately. By careful selection of a few representative measurement points, a reasonable smooth fit Piano Stretch Curve can be generated. Any number of measurements up to C7 can be used.

The Detailed Operation Manual can be viewed here:

The Precision Strobe Tuner Lite version is available for free download to evaluate and verify operation before purchasing.

What's New in Version 1.62

Fixed a major bug which caused the Strobe Display to malfunction for notes lower than about A440 due to a change in hardware audio sample rates on new iPhones.

Fixed a bug involving the microphone permission request on IOS10.

Improved Note Tracking Stability.

Added Low Frequency and 60Hz Noise Rejection Setting to Note Tracking Settings Page. Useful in some situations on newer iPhones with improved Low Frequency Sensitivity.

Added a Input Signal/Spectrum display page to the far left of the Settings section.

Added Landscape Orientation Support for iPad.

Added Upside Down Orientation Support for iPhone, which you can now hold with the microphone pointing away from you.


iPhone Screenshot 1
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iPhone Screenshot 4
iPad Screenshot 1
iPad Screenshot 2
iPad Screenshot 3
iPad Screenshot 4

Customer Reviews


After using the free app I paid to get rid of the time waster feature that gets pretty bad the more times you play with the app.


I do not recommend this app. Every time I launch it goes through a long involved procedure of teaching you how to use it which would've been nice the first time but then it just does it every time you launch it so it's pretty useless

Piano tuner

I do not recommend this app, it doesn't have a legitimate equal temperament.

Precision Strobe Tuner Lite
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This app is designed for both iPhone and iPad
  • Free
  • Category: Music
  • Updated:
  • Version: 1.62
  • Size: 1.2 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 6.1 or later. Compatible with iPhone, iPad, and iPod touch.

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