We are currently working hard on a native version for MacOS. However, this version will require Office 2016 or the Office 365 subscription.
empower for Mac will have the same functionality as our current version for Windows. At the moment, we expect empower to be available as a Mac version towards the end of 2018.
Of course you can use empower - until the time comes - easily in a virtual Windows environment (Parallels, VMWare, Remote Apps, etc.) on the Mac.