Buzz does not require use of a mobile phone or any kind of app.
Neosensory does offer a companion app for Buzz. It will be available for both iOS and Android phones. The Buzz app is currently compatible with iOS 12 and 13 as well as Android 8, 9, and 10.
If you choose to connect your Buzz to the app, you can unlock additional functionality such as music mode, night mode, frequency range, and vibration intensity controls.