Organ Tuner for iOS, v3.1

Designed for organ builders and technicians, our iPhone/iPod/iPad app provides the very best in pipe organ tuning.

Find the app in the App Store by clicking here:

Here is what the main tuning page looks like on the iPhone.  The bar with the two black squares is called the Phase Display.  The squares move left for flat and right for sharp, similar to a strobe tuner.  You tune the pipe so that the pattern comes to a stop.  This display is for fine-tuning. It is the most accurate tuning indicator available.

Below the current note display is a graph called the Spectrum Display.  Derived from a high-resolution Fourier Transform, this display gives additional information about the distribution of sound energy across the frequency spectrum.  If there are several pitches sounding at once, this graph will show a peak for each pitch.

Version History:

Version 3.1:
Organ Tuner now provides wireless control of MIDI-equipped organ consoles for key holding and stop selection using a Bluetooth/MIDI adapter to act as a key holder.  Devices are listed here.
Version 3.0:
Dark Mode is supported.
Version 2.7:
Modified handling of interruptions from phone calls to improve the restarting of Organ Tuner after the call. Corrected the reading of the Moat S2 temperature sensor. Added support for two more Govee temperature sensors (H5179 and H5174).
Version 2.6:
Support for three new Bluetooth temperature senors, shown below. The mutation rank/partial selection has been streamlined. Adaptations are made for iOS 12 and above. Several landscape layout issues have been corrected.
Version 2.4:
Adds a "pipe cutoff" calculation function to aid organ builders in cutting brand new pipes that have never been tuned. This version also fixes a bug in processing temperature readings from specific temperature sensors.
Version 2.3:
Fixes a "cancel temperament" bug that appeared with iOS 9.
Version 2.2:
Fixes a audio system compatibility problem with iOS 9.
Version 2.1:
Extends the provisions for receiving Bluetooth temperature readings for temperature compensation to include several more brands of sensors.

Bluetooth temperature sensors supported by Organ Tuner:

        See this list.

The best way to learn all about the Organ Tuner app features to download the manual right here:

Organ Tuner User's Manual

More historical temperaments (in addition to those that come pre-installed with the app) can be found here.

If you have any questions about the Organ Tuner app, please e-mail us at

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