FL Studio is available for both Windows and macOS.
Yes FL Studio is available as a native macOS / OS X application.
Full system requirements of FL Studio on the installer download page
If your system meets the minimum system requirements your actual system resources (memory, CPU speed) that will impose limits on your FL Studio projects. See here for more information on choosing good PC for FL Studio.
The faster your CPU the more channels you will be able to run simultaneously and/or the more effects you will be able to use. The more memory you have the larger the samples you will be able to load.
To find out how FL Studio behaves on your machine please download the trial and try it out for yourself.
As we have several products that run on Mac (eg. Morphine, Toxic Biohazard, Sawer, Sakura, Drumaxx, ...) you will also find an indication in our online shop on which OS the software runs (indicated with Windows and/or Mac icons).
The Image Line Support Team.