Biorhythm diagnosis is an Android app developed by siranet that helps users calculate their biorhythm and display their physical, emotional and intellectual states. The app is designed based on the theory that a person's life is influenced by rhythmic biological cycles.

Using the app is easy and straightforward. Users simply need to enter their birth date and the app will calculate their biorhythm. The app then displays a graph that shows the user's physical, emotional, and intellectual states. The graph also shows the critical days when the user's states will change. Additionally, the app provides a brief explanation of what each state means and how it can affect the user's daily life.

Overall, Biorhythm diagnosis is a useful app for those interested in monitoring their biorhythm and understanding how it affects their daily life. It's free to use and available on the Google Play Store for Android users.