Official specs from Steam

The Callisto Protocol system requirements

Minimum and recommended PC specs as listed by the developer on Steam.

Minimum

NoteRequires a 64-bit processor and operating system
OSWindows 10/11
ProcessorIntel® Core™ i5-8400 or AMD Ryzen™ 5 2600
Memory8 GB RAM
GraphicsNVIDIA® GeForce® GTX 1060 or AMD Radeon™ RX 580
DirectXVersion 11
Storage75 GB available space

Recommended

NoteRequires a 64-bit processor and operating system
OSWindows 10/11
ProcessorIntel® Core™ i7-8700 or AMD Ryzen™ 5 3600
Memory16 GB RAM
GraphicsNVIDIA® GeForce® GTX 1070 or AMD Radeon™ RX 5700
DirectXVersion 12
Storage75 GB available space
Additional NotesSSD recommended

FAQ

What graphics card do I need for The Callisto Protocol?

Minimum: NVIDIA® GeForce® GTX 1060 or AMD Radeon™ RX 580. Recommended: NVIDIA® GeForce® GTX 1070 or AMD Radeon™ RX 5700.

How much RAM does The Callisto Protocol need?

The Callisto Protocol needs 8 GB RAM at minimum, 16 GB RAM recommended.

How big is The Callisto Protocol?

The Callisto Protocol requires 75 GB available space.

Does The Callisto Protocol run on Mac or Steam Deck/Linux?

There is no native macOS version. There is no native Linux build (Proton compatibility may vary).