It's not made clear here in any way, which is a shame, but according to the developer's website: Snow Leopard Compatibility Today's release of Mac OS X 10.6, a.k.a. Snow Leopard, has brought many questions from people who want to know-- Does your software work on this new version of Mac OS X? The answer is, very simply, "yes". The current versions of all of my software work just fine on Snow Leopard. No updates are needed, so you can keep using the version you have.