Biorhythm Analysis Free (F4)

This app is a biorhythms analysis tool. It starts with an overview of two selected persons. From here you may view plots of individual biorhythms, a pair analysis, 3D representations of biorhythms or the harmony curve of the couple.
This app assumes that you have maintained contacts including birthday data. Then it is convenient to select the analyzed individuals by selecting them from the Contacts directory from where the app grabs the birthday data.
Of course you can also enter the birthday manually.

The theory of biorhythms is described in Wikipedia and will not be discussed further in the app - it is assumed that the viewer is familiar with the basics of the interpretation of the data.

It is true that this app wants to have access to your contacts. This is because it likes to get the birthday data by selecting a contact.