WARNING!
This Cockroach repelling app is not confirmed by science so treat it like a prank!
Absolutely new anti cockroach app! New Quality!

Many people are disgusted by cockroaches and can't close eyes at night, when they were visited on the day of the crawling insects. With the anti cockroaches sound simulation you can take their fears. Tell them, the app would beat cockroaches away with their high-pitched tone, similar to an ultrasonic mosquito plug.
Of course you should be clear, that your smartphone can not play a real ultrasonic sound! Also, there is no scientific evidence that cockroaches feel repelled by ultrasonic waves and goes away. Use this app to fool your friends and if necessary to take them also the fear. Note that these Simulation does not replace a real exterminator! Call always the professional, if there are many of them.
How does the cockroaches protection work?

The anti cockroaches app is quite simple: Choose between nine frequencies and start playback of the simulated ultrasonic sounds with a simple click. The frequency selection you should be sent to a tone that is barely no longer perceived by your ear.
Your friends will think your smartphone or tablet would play a right ultrasonic tone. This illusion is even more realistic by their sinusoidal oscillations during playback.