There are a lot of anti mosquito apps in the market claiming that their apps can “repel mosquitos” using ultrasonic sound waves but studies have shown that they do not work. The American Mosquito Control Association says 10 scientific studies of different ultrasonic mosquito repellent devices conducted since 1998 showed none of them had any effect on mosquito behavior. “The fact is that these devices just do not work – marketing claims to the contrary,” said the AMCA. Read more at AMCA website