If you are looking for top Biorhythms software, you just found it!

 Biorhythms for Windows Professional  features these  functions

Easy to use - all actions can be performed with the mouse, even not touching the keyboard
Resizable Chart
Possibility to export Biorhythms Charts to other Windows application
Built-in Calendar that covers 29 centuries and shows Critical (Risky) Days and Lunar Phases
Two different ways of printing of the Chart - WYSIWYG or high quality full page charts
Prints charts in color
Shows Biorhythms of two people simultaneously (compatibility of a couple)
Includes Database for storing of birth dates
Runs on any Windows platform - Windows 11, Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista, Windows XP 
Finds days that are similar to the selected one
Shows and prints Zodiac Signs
Prints full page high quality Calendar pages with marked Critical Days
Prints person's name on the Biorhythmic chart
Prints optional note on the chart
Allows to customize your Biorhythmic cycles by adjusting them
Calculates and shows Intuitional cycle (38-day rhythm) and its Critical Days
Shows Secondary Biorhythms - Passion, Wisdom, Mastery
Prints Biorhythms for entire year on one page
You can use program for commercial purposes without any restrictions - you can sell charts generated with Biorhythms for Windows Pro
...and more

Some Screen views of the Biorhythms Pro Program: