Biorhythms 9 for Mac OS is the best biorhythm program there is. Now highly acclaimed worldwide, no competitor comes even close to the power, functionality, or originality of this program. Available for Mac OS 9 and OS X.
The best looking Charts, and the most detailed and informative Comparisons (any number of people) are available within. Download a free evaluation copy now.
Version 8.0 is still available for Mac OS 8.x users.