I've used an app to drive mosquitoes away with sound like this before. The principle is that female mosquitoes in the spawning season avoid male mosquitoes. So the app sends out the frequency of male mosquitoes through speakers to reduce the frequency of female access. But nothing is perfect and I was bitten by a mosquito even though I was using a mosquito repellent app. So if I have to do outdoor activities, I apply liquid mosquito repellent on my arms and legs. And this worked quite well. Anyway, thanks for hunting a good mosquito repellent app.