# Organ Tuner

> Professional pipe organ tuning and maintenance tool with advanced displays and compensation features. (iPhone/iPad app by Real-Time Specialties.)

- Source: https://appshunter.io/ios/app/organ-tuner/id393104842 (this page in markdown: same URL + `.md`)
- Developer: [Real-Time Specialties](https://appshunter.io/developer/335568332)
- Category: Music, Utilities
- Price: $169.99
- Rating: 4.80/5 from 4 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 5 MB
- Languages: American English
- Released: 2010-10-30
- Data updated: 2026-08-30
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/organ-tuner/id393104842/reviews.md

## What is Organ Tuner?

This app is for professional pipe organ builders and technicians.  It addresses the special tuning needs of building, tuning and maintaining pipe organs.

Notable features:

* Covers the note range of C0 (32' pipe) to C9 (1/16' pipe)
* available MIDI control of keys with Bluetooth as a key holder
* Handles mutation ranks (Quint, etc.) and Celeste ranks
* Built-in compensation to track and compensate for temperature changes during tuning
* Calculates pipe cutoff for trimming new pipes to length
* Optional connection to Bluetooth temperature sensor for compensation of pitch
* Precision phase display for very precise tuning plus a spectrum display
* Accurate to 0.02 cent
* Provides many historical (unequal) temperaments for period music
    (See our support web page for a complete list.)
* Switches notes automatically up to 4 notes away

Organ Tuner has two different displays that are visible at once.  One is the strobe-like Phase Display.  This is a band where black squares move left or right.  You tune to make the squares stop moving.  The other is a Spectrum Display.  This is a graph that shows a peak for every pitch present in the sound.  You tune to make a peak in the graph move to a central red line.  Having both the Phase Display and the Spectrum Display visible at once gives you a more complete picture of the tuning than any single spinner-type or needle-type display.

## Key features

- Wide note range (C0 to C9)
- MIDI control with Bluetooth
- Handles mutation and Celeste ranks
- Temperature compensation
- Pipe cutoff calculation
- Precision phase and spectrum displays
- Supports historical temperaments

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/organ-tuner/id393104842/reviews.md

### 5/5 — Worth it (for professionals)

*2014-10-04*

I've used an awful lot of dedicated tuning gear and just about every app. If you tune organs professionally, this app will pay for itself very promptly.

### 5/5 — Outstanding!

*2014-03-06*

I used this app for the first time last night on a particularly difficult installation that is not only hard to access but is also tuned to a non equal temperament. The Organ Tuner app worked flawlessly for over five hours of nonstop tuning. Easy to read, easy to see, ability to precision tune is incredible. 

The Celeste tuning feature is excellent.  I've never found a system I've been happy with, however, now I can simply dial in the beat rate I weed and the app calculates the appropriate tuning four each note throughout the rank.  

The ability to adjust for temperature variations in the building is genius and invaluable.

### 5/5 — Pipe Organ Tuner shop and field experience

*2010-11-09*

Organ Tuner is invaluable for both normal tuning of finished pipe organs as well as pre-voicing and cutting new pipes to pitch in the voicing room.  There are special features that support both usage modes.

I have used previous PC versions of Organ Tuner in shop voicing situations.  The key iPhone version advantage is its portability when tuning installed organs.  I use a velcro carrier strap and wear the tuner on my wrist when tuning in cramped spaces.

The Organ Tuner is more accurate than one hears in aural tuning.  Tuners experience 'dead bands' when pipes sound in tune but are still marginally out.  The Organ Tuner's two displays indicates out of tuneness even after it is heard in tune giving a very solid tuning.

My fall tunings tested the iPhone tuner in many situations.  Testing included temperature compensation, equal and well-temperaments, single pipe and compound stop tuning, harmonic (mutation) stops, and auto note change.  The auto note changing will jump up or down up to four half tones for tuning major third chests.  The auto note changing worked in all conditions except for tuning some mixtures where the multiple pitches and harmonics caused some false switching.  This was remidied by changing notes manually.  In many situations stopping off the mixture pipes was not necessary and tuning could be easily accomplished by switching the partials of the given note.

In shop pre-voicing of pipes the Pipe Organ tuner is invaluable due to the high digital accuracy of pitch measurement.  I use a spread sheet to take the pipe length and measured cents flat to calculate the amount of pipe length to cut off.  The Organ Tuner measurement is so accurate that usually only one or two cutoffs are necessary rather than multiple times with a more conservative triming by ear.  High pitches up to the top C of a 61 note 2' stop (8000 Hz) are easily measured.

The unique features for the pipe organ make the Organ Tuner an essential tool for my tonal and tuning methodology.

## Frequently asked questions about Organ Tuner

### What is Organ Tuner used for?

Organ Tuner is designed for professional pipe organ builders and technicians to assist with the building, tuning, and maintenance of pipe organs. It offers specialized features for this complex task.

### What is the note range covered by Organ Tuner?

Organ Tuner covers an extensive note range from C0, corresponding to a 32' pipe, up to C9, which is a 1/16' pipe. This broad range accommodates most pipe organ configurations.

### Does Organ Tuner offer temperature compensation?

Yes, Organ Tuner includes built-in compensation to track and adjust for temperature changes during tuning. It can also connect to an optional Bluetooth temperature sensor for enhanced accuracy.

### What tuning displays does Organ Tuner provide?

Organ Tuner offers two simultaneous displays: a strobe-like Phase Display where users tune to stop moving squares, and a Spectrum Display which graphs pitches and allows tuning to a central red line. This dual display provides a comprehensive view.

### Can Organ Tuner handle different temperaments?

Yes, Organ Tuner provides many historical (unequal) temperaments, which are crucial for playing period music accurately. A full list of supported temperaments is available on their support web page.

### What is the price of Organ Tuner?

Organ Tuner is a paid application priced at $169.99. It is recommended to download and read the user's manual before purchasing.

### How accurate is Organ Tuner?

Organ Tuner is highly accurate, with a precision of 0.02 cents. This level of accuracy is essential for the delicate tuning required for pipe organs.

### Does Organ Tuner have ads?

No, Organ Tuner does not contain advertisements. As a paid application, it offers an ad-free experience for its professional users.

## Version history (last 5 releases)

### 3.3 — 2026-07-22

Support for Blue Maestro DiscMaxi, DiscMaxi 3 in 1, and DiscMaxi 4 in 1 temperature sensors for optional temperature compensation.

### 3.2 — 2024-06-22

1. A more accurate Spectrum Peak calculation makes the multi-pitch display more accurate.
2. Celeste settings (beat rates at C3 and C6) can now be saved by name and restored later.
3. The Phase Display strobe speed is now a smooth logarithmic function of the tuning error, which gives more resolution when close to the target pitch and more range when further away from the target.
4. List of historical temperaments is now shown in sorted order alphabetically to make it easier to find the one you want.

### 3.1 — 2023-09-04

Performs key holding functions on organs equipped with a MIDI interface through the use of a MIDI/Bluetooth adapter.

### 3.0 — 2023-03-01

* Optional Dark Mode is now supported.
* Two more temperature sensors for temperature compensation are now supported: the Govee GVH5075 and the Oria Wireless Thermometer.  For a complete list see
  www.tunelab-world.com/bluetoothdevices

### 2.7 — 2022-03-05

* 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.

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All apps by Real-Time Specialties: https://appshunter.io/developer/335568332

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*