iPhone Screenshots


"Mosquitone Detector" is a sound measurement app that detects high frequency noises and ultrasonic sounds hard to hear for human ears.

It may have been exposed to artificial high-frequency noise while you do not notice. This app can detect and visualize such high-frequency noises.

In general, the human audible range is said to be 20 Hz to 20 kHz, but very high frequency sounds above 10kHz will gradually become difficult to hear with age.
For example, there are increasing cases where high-frequency noise generators are installed in various places as a purpose of repelling young people and beast pests using very high frequency mosquito noises that can not be heard by general adults.
Especially for young children, there are cases that they stay in the bad place even though on a very uncomfortable noise environment because adults can not recognize at all.
Please use this app to find high frequency noise, so it will help you to quickly get away from the bad spot or remove the noise source.

This app has two operation modes, "Detection mode" and "Search mode".
“Detection mode” can check if there are high frequency and ultrasonic sounds that you can not hear. “Search mode” can find the direction of high-frequency sound source. It can only be used when it has found a high frequency sound in "Detection Mode". The mode can be switched by MODE button.

Operating procedure:
1) Detection mode
On Detection mode, it finds an inaudible high frequency and ultrasonic sound in the frequency band of 16 kHz to 23 kHz.
Tap Start button and it starts the detection function. If high frequency or ultrasonic sound exist, it will be displayed on the graph as the peak frequency.

2) Search mode
On Search mode, it finds the direction of occurrence of the high-frequency sound source that detected the peak frequency. “Search mode” can be used only when high frequency or ultrasonic sound is founded in “Detection mode".
Please make sure to hold the bottom built-in microphone of iPhone so that it faces outward. If you measure with the microphone facing inward, microphone sensitivity will deteriorate and accurate measurement will not be possible.
Tap Start button, and firmly hold the iPhone terminal, please turn slowly clockwise. Recommended that the time required for a rotation is about 15 seconds and the rotation speed in the graph is approximately 4 rpm.
The measurement is completed by one revolution, and the signal strength of the peak frequency is displayed on the pie chart. You can find approximate direction of the high-frequency sound source relative to your standing position.

3) Snapshot
Tag SNAP button, you can save the measurement result as “Photos” as an image file. The measurement time stamp is also displayed in the image.

4) Info.
Tap INFO button, it displays the operating procedure, support link and product information.

Note :
If the frequency changes periodically or randomly, it is not possible to determine the direction of occurrence in "Search mode".
Ultrasonic measurement depends on the sensitivity characteristics of the built-in microphone, so the measurement result may vary.

Remarks :
It is still under study about health effects on human body by listening to high-frequencies including ultrasonic sound. If the high frequency noise of high level is detected daily, we recommend that you consult an expert.

What's New

Version 1.1

- Some minor improvements.
- Requires iOS11.4 or later.


2.2 MB
Requires iOS 11.4 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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