Official specs from Steam

The Witness system requirements

Minimum and recommended PC specs as listed by the developer on Steam. Native macOS version available.

The Witness release infoSteam page Check other games

Minimum

OS *Windows 7
Processor1.8GHz
Memory4 GB RAM
GraphicsIntel HD 4000 series
DirectXVersion 10
Storage5 GB available space

Recommended

OS *Windows 7
Processor2.4GHz
Memory8 GB RAM
GraphicsGeForce 780
DirectXVersion 10
Storage5 GB available space

macOS minimum

OS10.11.6 (El Capitan)
Processor1.8GHz
GraphicsIntel HD 4000 series
Storage5 GB available space
Additional NotesMetal support required

macOS recommended

OS10.12.3 (Sierra)
Processor2.4GHz
GraphicsRadeon R9 M370X
Storage5 GB available space
Additional NotesMetal support required

FAQ

What graphics card do I need for The Witness?

Minimum: Intel HD 4000 series. Recommended: GeForce 780.

How much RAM does The Witness need?

The Witness needs 4 GB RAM at minimum, 8 GB RAM recommended.

How big is The Witness?

The Witness requires 5 GB available space.

Does The Witness run on Mac or Steam Deck/Linux?

Yes, there is a native macOS version. There is no native Linux build (Proton compatibility may vary).