Binality, developed by Virtual Arenas, is a free Android app that uses binaural beats to guide the brain to desired states for enhancing meditation, relaxation, concentration, and more. The app offers preset programs, as well as the option to create custom programs or set a desired frequency using the custom preset. However, it requires the use of stereo headphones for optimal effectiveness.

The app's interface is user-friendly and easy to navigate. Users can select from a variety of preset programs, including ones for relaxation, focus, and sleep. Additionally, the custom preset feature allows users to create their own programs by selecting the desired frequencies and time intervals. The app also offers a timer and the ability to save custom programs for future use.

Overall, Binarity is an excellent app for those looking to enhance their meditation and relaxation practices. While it may take some time to get used to the binaural beats, the app's ease of use and customizable features make it a great tool for anyone looking to improve their mental state.