Dog Whistle is a free Android app developed by Spun, which is a useful tool for dog owners to train their dogs. This app allows you to use certain frequencies when your dog does something bad or good. You can also teach your dog new tricks by using different frequencies.

One of the main features of the app is the remote controller, which allows you to set 8 frequencies ranging from 5-22 kHz. To save a frequency, simply tap on one of the buttons, and to reset it, just long-click on it. The app is very intuitive and easy to use, which makes it accessible for all dog owners, regardless of their level of technological expertise.