Citavi is a Windows program. A Mac version is not available, but we are working on an online version, which will also run on Macs. If you are interested in participating in the beta test, you can register for our newsletter
 
Until the online version is available, Citavi can be run on Macs under Windows, using a so-called virtual machine to run Windows without having to restart your Mac. And since Windows is kept within a "sandboxed" environment, it can't cause problems with the Mac. By carefully setting up your virtual machine, you can make working with Citavi almost seamless.
 
In the Citavi online manual you can find detailed instructions for installing Citavi on your Mac.