The application calculates your personal biorhythm predictions for today and each day you want according to https://en.wikipedia.org/wiki/Biorhythm. The results are displayed graphically as a curve, as percentage value and the tendency forecast as an arrow.
The physical state, the emotional state and the intellectual state are calculated. Furthermore the app allows the calculation of the intuitive state as well as the average over all biorhythms.
It is also possible to calculate biorhythms for other persons you are able to add as many users as you want. The number off possible contacts is unlimited. 

The calculated biorhythms are:
• physical, the cycle is 23 days
• emotional, the cycle is 28 days
• intellectual, the cycle is 33 days
• intuitive, the cycle is 38 days

The meanings of the different biorhythms curves are
• The physical biorhythm determines human energy, strength, endurance and coordination of movement.
• The emotional biorhythm determines condition of the nervous system and mood.
• The intellectual biorhythm determines the creative abilities of the individual.
• The intuitive biorhythm affects your intuition and the decision making ability

Features:
• Unlimited number of users
• Calculation for every day you want
• Recognition of critical days (days when the curve passes the zero line)
• Prediction of the tendency
• Settings whether showing the rhythms as filled curves or lines
• Activate and deactivate rhythms
• Average Curve
• Moon Phase Calculator
• Change Curve Colors
• Journal
• Calculation of importend days like maximum or next critical day
• Share Feature
• Home Screen Widget
• Daily notifications – you can switch them of if you want
• You can choose the time of the notification
• Clean and responsive design
• Night Mode

Translations:
• English
• German
• Spanish 

More will coming soon.

For more informations how the curves are calculated see:
Wikipedia

Personal biorhythm calculator. Free and easy to use. Clean and responsive design