Mosquito Repeller is an app that tries to repel mosquitoes using high frequency sounds. Though some studies found this method ineffective you may still try this for yourself. Some mosquitoes may not react at all to this app, but you may still try. You can vary the frequency using the slider. The frequency ranges from 14,000 Hz to 24,000 Hz. Take care though of the phone speakers as high frequency sounds are quite an exertion. This application is fun for testing your hearing sensitivity for high frequencies. Enjoy it!