Bull Button is a free lifestyle app developed by ByOlegs for Android devices. As the name suggests, it is a simple application that allows users to call out bull without having to say a word. With just a tap of a button, the app emits a loud and clear bull sound that can be heard by everyone around.

The app is perfect for situations where you want to call out someone for their dishonesty or simply want to have some fun with friends and family. The app is easy to use and has no complicated menus or settings. Just open the app, tap the button, and let the bull sound do the talking. Best of all, it is completely free and can be downloaded from the Google Play Store.