Engine Sound Analyzer:RPM Calc

Installs

63.7k

Rating

3.8

Rating count

< 500

Category	Auto & Vehicles
Developer	池田順子
Price	Free
First release	9/7/2021 (4 years ago)
Version	1.4
In-app purchases	No
Contains ads	No
Content rating	Everyone
Package name	i.jetik.BIKERPM

View on Play Store

Core Metrics

Data Breakdown

Date	Rating Count	Average Rating	Installs	Version
7/24/2025	188	3.800	63,671	1.4
7/23/2025	188	3.800	63,599	1.4
7/22/2025	188	3.800	63,554	1.4
7/21/2025	188	3.800	63,447	1.4
7/20/2025	188	3.800	63,355	1.4
7/18/2025	0	0.000	63,249	1.4
7/17/2025	0	0.000	63,172	1.4
7/16/2025	0	0.000	63,088	1.4
7/14/2025	0	0.000	63,025	1.4
7/13/2025	185	3.800	62,889	1.4
7/12/2025	185	3.800	62,816	1.4
7/11/2025	185	3.800	62,722	1.4
7/6/2025	0	0.000	62,326	1.4
7/5/2025	0	0.000	62,245	1.4
7/4/2025	0	0.000	62,176	1.4
7/3/2025	0	0.000	62,076	1.4
7/2/2025	0	0.000	62,040	1.4
7/1/2025	0	0.000	61,979	1.4
6/30/2025	0	0.000	61,905	1.4
6/29/2025	0	0.000	61,838	1.4
6/26/2025	184	3.800	61,640	1.4
6/25/2025	185	3.800	61,604	1.4
6/24/2025	185	3.800	61,536	1.4
6/23/2025	185	3.800	61,476	1.4
6/22/2025	186	3.800	61,419	1.4
6/21/2025	186	3.800	61,334	1.4
6/20/2025	0	0.000	61,255	1.4
6/19/2025	0	0.000	61,179	1.4
6/18/2025	0	0.000	61,122	1.4
6/17/2025	0	0.000	61,078	1.4
6/16/2025	184	3.800	61,021	1.4
6/15/2025	184	3.800	60,942	1.4
6/14/2025	0	0.000	60,866	1.4
6/9/2025	0	0.000	60,690	1.4
6/8/2025	0	0.000	60,557	1.4
5/29/2025	0	0.000	60,483	N/A
5/28/2025	0	0.000	59,806	N/A
5/22/2025	0	0.000	59,417	N/A
5/21/2025	0	0.000	59,293	N/A
5/20/2025	0	0.000	59,247	N/A
4/24/2025	0	0.000	57,756	N/A
4/10/2025	0	0.000	57,200	N/A

Details

It is an application that estimates the engine Revolutions Per Minute [RPM] from the exhaust noise of a motorcycle or car when idling. By all means for maintenance of vehicles without tachometers such as scooters !


The idling sound includes the sound of the engine exploding, the rotation of the crankshaft / motor e.t.c., and the sound of various parts.
This application divides the sound measured by the microphone for each frequency and calculates the rotation speed [rpm] from the loudest frequency.
* Measurement results may vary due to various factors such as ambient sound, vehicle type, terminal used, and distance from the sound source. Please treat the measurement result as a reference value. In addition, it may not be possible to measure correctly depending on the model, rotation speed, and microphone performance.


• Set the number of engine strokes and cylinders
• Start measurement with “RUN” or “▷”
• Adjust the Gain and Threshold to place the peak value above the Threshold line
• Select any peak with "<" and ">"
• Stop at “□”
* Measurement will stop when the count is exhausted. You can extend the measurement time by seeing the reward advertisement or restart.


* Never use it while driving. There is a risk of accidents.
* Do not touch the heat source, keep away from it. There is a risk of burns or terminal failure.
* Securely fix the vehicle or machine so that it does not move. It may fall or move suddenly, leading to an unexpected accident.


For a long time, DIY has always liked to maintain motorcycles as a hobby.
When deciding the idling height while thinking "Is it like this?" When repairing an engine malfunction or carburetor in winter, or when adjusting the air screw, ask "Where is the number of revolutions high?" I was setting the settings while feeling. Then I had the opportunity to study the Fourier transform in another case, and if I analyze the engine sound with this, I think it can be quantified. What I thought was interesting was the reason I decided to do DIY.

I hope this app helps someone somewhere in the world.

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