From the product page on his website... http://www.eyehit.com/degei/product.htm
Based on that review, it doesn't sound like it will run on the native Mac OS, but I would still recommend contacting him to be sure...This is really, really great software, and even works quite well on Mac OS X.2 running Virtual PC with Win2K. HerpHelper (Degei) has just about any feature one could want, including feed, expense, breeding & inventory reports, a feeder "pull list," photos & clutch tracking for breeding projects & individual animals both, and FABULOUS customer service from a fellow herper. Damon has been wonderful at answering my plethora of questions (even the "dumb" ones) and his personal experience as a herp keeper lends itself to making this one of the most well-rounded pieces of herp software available today. I love it. I use it. I highly recommend it! - Kara L. Glasgow - NERD, Inc.