Version history
Engine RPM
34
ASO score
Text
38/100
Reviews
0/100
Graphic
60/100
Other
0/100
App Rating
2.4
Votes
73
App Age
16y
Last Update
Sep 13, 2023
Compare with Category Top Apps
|
Metrics
|
Current App
|
Category Top Average
|
Difference
|
|---|---|---|---|
|
Rating
|
2.33
|
4.65
|
-50%
|
|
Number of Ratings (Voted)
|
72
|
3.2M
|
-100%
|
|
App Age
|
16y 0m
|
7y 8m
|
+108%
|
|
Price
|
$9
|
$0
|
|
|
In-app Purchases Price
|
$0
|
$69
|
|
|
Update Frequency
|
823d
|
27d
|
+2 917%
|
|
Title Length
|
10
|
23
|
-57%
|
|
Subtitle Length
|
19
|
28
|
-32%
|
|
Description Length
|
1 583
|
3 038
|
-48%
|
|
Number of Screenshots
|
468
|
1325
|
-65
%
|
|
Size
|
3MB
|
284MB
|
-99
%
|
Category Ranking in United States
7 days
Last 7 days
Last 30 days
Last 90 days
Last 180 days
Last year
| Top | Dec 06, 2025 | Dec 13, 2025 |
|---|---|---|
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No results were found!
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| Top | Dec 06, 2025 | Dec 13, 2025 |
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No results were found!
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| Top | Dec 06, 2025 | Dec 13, 2025 |
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No results were found!
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| Top | Dec 06, 2025 | Dec 13, 2025 |
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No results were found!
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Ranking Keywords in United States
| Keywords | App Rank |
|---|
Analyze this and other apps using Asolytics tools
Text ASO
Title
(
Characters:
10
of 30
)
Engine RPM
Subtitle
(
Characters:
19
of 30
)
Acoustic Tachometer
Description
(
Characters:
1583
of 4000
)
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.}
Read more
Other
Additional Information
| Rating: | |
| Voted: | 73 |
| App Store Link: | |
| Price: | 8.99 $ |
| Website: | |
| Email: | - |
| Privacy Policy: | |
| Categories: | Productivity, Utilities |
| Size: | 3MB |
| App Age: | 16 years |
| Release Date: | Dec 02, 2009 |
| Last Update: | Sep 13, 2023 |
| Version: | 2.5 |
Version history
2.5
Sep 13, 2023
* 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.
5.2
Mar 31, 2021
Thanks for using our app! To make our app better for you, we bring updates to the App Store regularly. Updates will include new features, fixes and performance improvements. In this version we have included fix for buttons not responding intermittendly.