Engine RPM2.6.1 - App Store
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Publisher Description
Measure the RPM of an engine by analyzing the sound it makes. Engine RPM listens to the sound of a running engine and uses advanced signal processing algorithms to extract the frequency of that sound and calculate the RPM.
This app is primarily for setup and diagnostics of engines. After setting the the number of cylinders and whether the engine is a 2-stroke or 4-stroke engine, the app can work with any internal combustion engine, from diesel tractors to aircraft engines to motorcycles to chainsaws. To use the app you must set an expected RPM range to guide the analysis algorithms to the correct RPM. A real-time graph of the autocorrelation graph is displayed to help in troubleshooting and adjusting the expected RPM range.
The analysis requires a clear sound from the engine without excessive interference from extraneous sounds. Do not expect to read the RPM of an engine while other things are making too much noise at the same time. The analysis also requires that the RPM be stable. It cannot read the RPM of an engine that is rapidly accelerating. For this reason, and because of the need for adjusting the expected RPM range, this app should not be considered a drop-in replacement for an operational tachometer.
Setup options include update periods from 93 milliseconds to 1.5 seconds, one to 12 cylinders, 2-stroke or 4-stroke, low-pass filtering, and signal clipping. The overall RPM range is 400 to 90,000 RPM (although at any one time, the operational range is typically +/- 30% around a nominal expected RPM). Precision is usually about +/- 10 RPM.
Version History Fixed a bug that prevented the saving of the number of cylinders when the app is closed. 2.6.1 Oct 2 1. The app is updated to target iOS 26 requirements.
2. The colors of the engine type selection page are changed to enhance clarity.
3. Size of log of RPM readings is doubled from 512 to 1024.
4. Minimum logging interval lowered from 2 seconds to 1 second. 2.6 Sep 12 * Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded. 2.5 09/13/2023 Fixed a problem with Settings visibility when Dark Mode is used in iOS 13. 2.4.1 07/01/2020 * Improved signal analysis calculations, making envelope detection unnecessary.
* Use of speaker in "Match RPM sound" mode is louder.
* Revised time-stamp in logging to reflect time of day.
* Configurable logging interval.
* Improved help files. 2.4 06/18/2020 1. Sample times up to 3 seconds for measuring lower RPM.
2. Envelope detection option.
3. Sound-generating option for manually matching to the engine sound.
4. More extensive help files for each setting option. 2.3 05/27/2016 iOS 9 compatibility issue fixed.
Added user-configurable sample lengths for faster-changing RPM.
Improved analysis algorithms for better sensitivity and noise rejection.
Added a logging function for saving RPM readings over time and sending them by e-mail. 2.2 11/17/2015 Fixed a crash in iOS 7 devices. 2.1 09/24/2013 Improved analysis of the engine sound, using an autocorrelation algorithm that provides more reliable RPM readings.
Addition of an automatic mode option; no adjustments needed.
Compatibility with iPhone 5 (software utilizes all of the 4-inch screen). 2.0 06/14/2013 Spectrum analysis has been improved to better identify the harmonics of the engine sound.
A new Tracking mode has been added to track changing RPM over the entire 500-90,000 RPM range.
The range of harmonics used in analysis is now selectable, using harmonics 1-16.
The 4-cycle, 1-cylinder engine has been added to the list of stock engine configurations.
Detection of a missing microphone for the iPod Touch has been added. 1.1 06/24/2010 1.0 12/02/2009
About Engine RPM
The company that develops Engine RPM is Real-Time Specialties, inc.. The latest version released by its developer is 2.6.1.
To install Engine RPM on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2026-10-14 and was downloaded 0 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the Engine RPM as malware if the download link is broken.
How to install Engine RPM on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the Engine RPM is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After Engine RPM is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
Program Details
System requirements
Download information
Pricing
Version History
version 2.6.1
posted on 2026-10-14
Version History Fixed a bug that prevented the saving of the number of cylinders when the app is closed. 2.6.1 Oct 2 1. The app is updated to target iOS 26 requirements.
2. The colors of the engine type selection page are changed to enhance clarity.
3. Size of log of RPM readings is doubled from 512 to 1024.
4. Minimum logging interval lowered from 2 seconds to 1 second. 2.6 Sep 12 * Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded. 2.5 09/13/2023 Fixed a problem with Settings visibility when Dark Mode is used in iOS 13. 2.4.1 07/01/2020 * Improved signal analysis calculations, making envelope detection unnecessary.
* Use of speaker in "Match RPM sound" mode is louder.
* Revised time-stamp in logging to reflect time of day.
* Configurable logging interval.
* Improved help files. 2.4 06/18/2020 1. Sample times up to 3 seconds for measuring lower RPM.
2. Envelope detection option.
3. Sound-generating option for manually matching to the engine sound.
4. More extensive help files for each setting option. 2.3 05/27/2016 iOS 9 compatibility issue fixed.
Added user-configurable sample lengths for faster-changing RPM.
Improved analysis algorithms for better sensitivity and noise rejection.
Added a logging function for saving RPM readings over time and sending them by e-mail. 2.2 11/17/2015 Fixed a crash in iOS 7 devices. 2.1 09/24/2013 Improved analysis of the engine sound, using an autocorrelation algorithm that provides more reliable RPM readings.
Addition of an automatic mode option; no adjustments needed.
Compatibility with iPhone 5 (software utilizes all of the 4-inch screen). 2.0 06/14/2013 Spectrum analysis has been improved to better identify the harmonics of the engine sound.
A new Tracking mode has been added to track changing RPM over the entire 500-90,000 RPM range.
The range of harmonics used in analysis is now selectable, using harmonics 1-16.
The 4-cycle, 1-cylinder engine has been added to the list of stock engine configurations.
Detection of a missing microphone for the iPod Touch has been added. 1.1 06/24/2010 1.0 12/02/2009
version 2.6.1
posted on 2026-10-07
Version History Fixed a bug that prevented the saving of the number of cylinders when the app is closed. 2.6.1 4d ago 1. The app is updated to target iOS 26 requirements.
2. The colors of the engine type selection page are changed to enhance clarity.
3. Size of log of RPM readings is doubled from 512 to 1024.
4. Minimum logging interval lowered from 2 seconds to 1 second. 2.6 Sep 12 * Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded. 2.5 09/13/2023 Fixed a problem with Settings visibility when Dark Mode is used in iOS 13. 2.4.1 07/01/2020 * Improved signal analysis calculations, making envelope detection unnecessary.
* Use of speaker in "Match RPM sound" mode is louder.
* Revised time-stamp in logging to reflect time of day.
* Configurable logging interval.
* Improved help files. 2.4 06/18/2020 1. Sample times up to 3 seconds for measuring lower RPM.
2. Envelope detection option.
3. Sound-generating option for manually matching to the engine sound.
4. More extensive help files for each setting option. 2.3 05/27/2016 iOS 9 compatibility issue fixed.
Added user-configurable sample lengths for faster-changing RPM.
Improved analysis algorithms for better sensitivity and noise rejection.
Added a logging function for saving RPM readings over time and sending them by e-mail. 2.2 11/17/2015 Fixed a crash in iOS 7 devices. 2.1 09/24/2013 Improved analysis of the engine sound, using an autocorrelation algorithm that provides more reliable RPM readings.
Addition of an automatic mode option; no adjustments needed.
Compatibility with iPhone 5 (software utilizes all of the 4-inch screen). 2.0 06/14/2013 Spectrum analysis has been improved to better identify the harmonics of the engine sound.
A new Tracking mode has been added to track changing RPM over the entire 500-90,000 RPM range.
The range of harmonics used in analysis is now selectable, using harmonics 1-16.
The 4-cycle, 1-cylinder engine has been added to the list of stock engine configurations.
Detection of a missing microphone for the iPod Touch has been added. 1.1 06/24/2010 1.0 12/02/2009
version 2.6.1
posted on 2026-10-03
Version History Fixed a bug that prevented the saving of the number of cylinders when the app is closed. 2.6.1 1d ago 1. The app is updated to target iOS 26 requirements.
2. The colors of the engine type selection page are changed to enhance clarity.
3. Size of log of RPM readings is doubled from 512 to 1024.
4. Minimum logging interval lowered from 2 seconds to 1 second. 2.6 Sep 12 * Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded. 2.5 09/13/2023 Fixed a problem with Settings visibility when Dark Mode is used in iOS 13. 2.4.1 07/01/2020 * Improved signal analysis calculations, making envelope detection unnecessary.
* Use of speaker in "Match RPM sound" mode is louder.
* Revised time-stamp in logging to reflect time of day.
* Configurable logging interval.
* Improved help files. 2.4 06/18/2020 1. Sample times up to 3 seconds for measuring lower RPM.
2. Envelope detection option.
3. Sound-generating option for manually matching to the engine sound.
4. More extensive help files for each setting option. 2.3 05/27/2016 iOS 9 compatibility issue fixed.
Added user-configurable sample lengths for faster-changing RPM.
Improved analysis algorithms for better sensitivity and noise rejection.
Added a logging function for saving RPM readings over time and sending them by e-mail. 2.2 11/17/2015 Fixed a crash in iOS 7 devices. 2.1 09/24/2013 Improved analysis of the engine sound, using an autocorrelation algorithm that provides more reliable RPM readings.
Addition of an automatic mode option; no adjustments needed.
Compatibility with iPhone 5 (software utilizes all of the 4-inch screen). 2.0 06/14/2013 Spectrum analysis has been improved to better identify the harmonics of the engine sound.
A new Tracking mode has been added to track changing RPM over the entire 500-90,000 RPM range.
The range of harmonics used in analysis is now selectable, using harmonics 1-16.
The 4-cycle, 1-cylinder engine has been added to the list of stock engine configurations.
Detection of a missing microphone for the iPod Touch has been added. 1.1 06/24/2010 1.0 12/02/2009
version 2.6
posted on 2026-09-26
Version History 1. The app is updated to target iOS 26 requirements.
2. The colors of the engine type selection page are changed to enhance clarity.
3. Size of log of RPM readings is doubled from 512 to 1024.
4. Minimum logging interval lowered from 2 seconds to 1 second. 2.6 Sep 12 * Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded. 2.5 09/13/2023 Fixed a problem with Settings visibility when Dark Mode is used in iOS 13. 2.4.1 07/01/2020 * Improved signal analysis calculations, making envelope detection unnecessary.
* Use of speaker in "Match RPM sound" mode is louder.
* Revised time-stamp in logging to reflect time of day.
* Configurable logging interval.
* Improved help files. 2.4 06/18/2020 1. Sample times up to 3 seconds for measuring lower RPM.
2. Envelope detection option.
3. Sound-generating option for manually matching to the engine sound.
4. More extensive help files for each setting option. 2.3 05/27/2016 iOS 9 compatibility issue fixed.
Added user-configurable sample lengths for faster-changing RPM.
Improved analysis algorithms for better sensitivity and noise rejection.
Added a logging function for saving RPM readings over time and sending them by e-mail. 2.2 11/17/2015 Fixed a crash in iOS 7 devices. 2.1 09/24/2013 Improved analysis of the engine sound, using an autocorrelation algorithm that provides more reliable RPM readings.
Addition of an automatic mode option; no adjustments needed.
Compatibility with iPhone 5 (software utilizes all of the 4-inch screen). 2.0 06/14/2013 Spectrum analysis has been improved to better identify the harmonics of the engine sound.
A new Tracking mode has been added to track changing RPM over the entire 500-90,000 RPM range.
The range of harmonics used in analysis is now selectable, using harmonics 1-16.
The 4-cycle, 1-cylinder engine has been added to the list of stock engine configurations.
Detection of a missing microphone for the iPod Touch has been added. 1.1 06/24/2010 1.0 12/02/2009
version 2.6
posted on 2026-09-12
Version History 1. The app is updated to target iOS 26 requirements.
2. The colors of the engine type selection page are changed to enhance clarity.
3. Size of log of RPM readings is doubled from 512 to 1024.
4. Minimum logging interval lowered from 2 seconds to 1 second. 2.6 3h ago * Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded. 2.5 09/13/2023 Fixed a problem with Settings visibility when Dark Mode is used in iOS 13. 2.4.1 07/01/2020 * Improved signal analysis calculations, making envelope detection unnecessary.
* Use of speaker in "Match RPM sound" mode is louder.
* Revised time-stamp in logging to reflect time of day.
* Configurable logging interval.
* Improved help files. 2.4 06/18/2020 1. Sample times up to 3 seconds for measuring lower RPM.
2. Envelope detection option.
3. Sound-generating option for manually matching to the engine sound.
4. More extensive help files for each setting option. 2.3 05/27/2016 iOS 9 compatibility issue fixed.
Added user-configurable sample lengths for faster-changing RPM.
Improved analysis algorithms for better sensitivity and noise rejection.
Added a logging function for saving RPM readings over time and sending them by e-mail. 2.2 11/17/2015 Fixed a crash in iOS 7 devices. 2.1 09/24/2013 Improved analysis of the engine sound, using an autocorrelation algorithm that provides more reliable RPM readings.
Addition of an automatic mode option; no adjustments needed.
Compatibility with iPhone 5 (software utilizes all of the 4-inch screen). 2.0 06/14/2013 Spectrum analysis has been improved to better identify the harmonics of the engine sound.
A new Tracking mode has been added to track changing RPM over the entire 500-90,000 RPM range.
The range of harmonics used in analysis is now selectable, using harmonics 1-16.
The 4-cycle, 1-cylinder engine has been added to the list of stock engine configurations.
Detection of a missing microphone for the iPod Touch has been added. 1.1 06/24/2010 1.0 12/02/2009
version 2.5
posted on 2026-09-05
Version History * Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded. 2.5 09/13/2023 Fixed a problem with Settings visibility when Dark Mode is used in iOS 13. 2.4.1 07/01/2020 * Improved signal analysis calculations, making envelope detection unnecessary.
* Use of speaker in "Match RPM sound" mode is louder.
* Revised time-stamp in logging to reflect time of day.
* Configurable logging interval.
* Improved help files. 2.4 06/18/2020 1. Sample times up to 3 seconds for measuring lower RPM.
2. Envelope detection option.
3. Sound-generating option for manually matching to the engine sound.
4. More extensive help files for each setting option. 2.3 05/27/2016 iOS 9 compatibility issue fixed.
Added user-configurable sample lengths for faster-changing RPM.
Improved analysis algorithms for better sensitivity and noise rejection.
Added a logging function for saving RPM readings over time and sending them by e-mail. 2.2 11/17/2015 Fixed a crash in iOS 7 devices. 2.1 09/24/2013 Improved analysis of the engine sound, using an autocorrelation algorithm that provides more reliable RPM readings.
Addition of an automatic mode option; no adjustments needed.
Compatibility with iPhone 5 (software utilizes all of the 4-inch screen). 2.0 06/14/2013 Spectrum analysis has been improved to better identify the harmonics of the engine sound.
A new Tracking mode has been added to track changing RPM over the entire 500-90,000 RPM range.
The range of harmonics used in analysis is now selectable, using harmonics 1-16.
The 4-cycle, 1-cylinder engine has been added to the list of stock engine configurations.
Detection of a missing microphone for the iPod Touch has been added. 1.1 06/24/2010 1.0 12/02/2009
version 2.5
posted on 2023-09-13
* Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded.
version 2.5
posted on 2023-09-13
Sep 13, 2023
Version 2.5
* Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded.
version 2.4.1
posted on 2020-07-01
Jul 1, 2020
Version 2.4.1
Fixed a problem with Settings visibility when Dark Mode is used in iOS 13.
version 2.3
posted on 2009-12-02
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Official App Store Link
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