System requirements

While the game is still in Early Access the system requirements can still change substantially.

General
Those are the same on all operating systems.

Minimal

 * OS: a 64-bit operating system
 * Memory: 4 GB RAM
 * Graphics: Intel HD Graphics 6000 / AMD Radeon HD 7700
 * Storage: 300 MB available space
 * Sound Card: Yes

Recommended

 * Memory: 8 GB RAM
 * Graphics: Nvidia GTX 760 / Nvidia GTX 960M / AMD R9 280
 * Storage: 500 MB available space
 * Sound Card: Very much yes.

Minimal

 * OS: Windows 7 64-bit
 * Processor: Intel Core i3

Recommended

 * OS: Windows 7 64-bit
 * Processor: Intel Core i5-4670K or equivalent

Minimal

 * OS: OS X 10.11 El Capitan
 * Processor: Intel Core i5

Recommended

 * OS: macOS 10.12 Sierra
 * Processor: Intel Core i5

Minimal

 * OS: Ubuntu 12.04 or higher
 * Processor: Intel Core i3
 * Additional: xrandr installed (most distros have it by default)

Recommended

 * Processor: Intel Core i5-4670K