In order for you to play Outlast on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X 10.9
Processor (CPU):
2.2 GHz Dual Core CPU
Memory (RAM):
4 GB RAM
Graphics Card:
GeForce GT 750M / Intel Iris Pro 5200 / Radeon HD 3xxx
Storage:
5 GB available space
Sound Card:
Standard
In order to play Outlast on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
OS X 10.9
Processor (CPU):
2.8 GHz Quad Core CPU
Memory (RAM):
4 GB RAM
Graphics Card:
1GB NVIDIA GTX 460 / ATI Radeon HD 6850
Storage:
5 GB available space
Sound Card:
Standard