In order for you to play Monstrum on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OSX 10.8.5 (Mountain Lion)
Processor (CPU):
Intel / AMD - 2.4 GHz (Dual Core)
Memory (RAM):
4 GB RAM
Graphics Card:
Nvidia GTX 285 / ATI Radeon HD 4870 X2 - 1GB (Direct x 9.0c / 10 / 11)
Storage:
3 GB available space
In order to play Monstrum on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
OSX 10.9.5 (Mavericks)
Processor (CPU):
Intel Core i5 / AMD FX-6 - 3.0+ GHz (Quad Core)
Memory (RAM):
8 GB RAM
Graphics Card:
Nvidia GTX 560 Ti / AMD Radeon HD 6970 - 1GB (Direct x 11)
Storage:
3 GB available space