Official specs from Steam

Inside system requirements

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

Minimum

OSWindows 10 (64-bit OS required)
ProcessorIntel Core 2 Quad Q6600 @ 2.4 GHz, AMD FX 8120 @ 3.1 GHz
Memory4 GB RAM
GraphicsNVIDIA GT 630 / 650m, AMD Radeon HD6570 or equivalent
DirectXVersion 9.0c
Storage3 GB available space
Sound Card100% DirectX 9.0c compatible sound card

Recommended

OSWindows 10 or later (64-bit OS required)
ProcessorIntel i7 920 @ 2.7 GHz, AMD Phenom II 945 @ 3.0 GHz
Memory8 GB RAM
GraphicsNVIDIA GTX 660, Radeon R9-270
DirectXVersion 11
Storage3 GB available space
Sound Card100% DirectX 9.0c compatible sound card

FAQ

What graphics card do I need for Inside?

Minimum: NVIDIA GT 630 / 650m, AMD Radeon HD6570 or equivalent. Recommended: NVIDIA GTX 660, Radeon R9-270.

How much RAM does Inside need?

Inside needs 4 GB RAM at minimum, 8 GB RAM recommended.

How big is Inside?

Inside requires 3 GB available space.

Does Inside run on Mac or Steam Deck/Linux?

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