Official specs from Steam

Life is Strange: Before the Storm system requirements

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

Minimum

NoteRequires a 64-bit processor and operating system
OS *Windows 7 or above (64-bit Operating System Required)
ProcessorIntel Core i3-2100 (3.1GHz) or AMD Phenom X4 945 (3.0GHz)
Memory3 GB RAM
GraphicsAMD Radeon R7 250 or NVIDIA Geforce GTX 650
DirectXVersion 11
Storage14 GB available space
Additional NotesPlease note that 32-bit operating systems will not be supported.

Recommended

NoteRequires a 64-bit processor and operating system
OSWindows 10 64-bit
ProcessorIntel Core i3-6100 (3.7GHz) or AMD Athlon X4 845 (3.5GHz)
Memory6 GB RAM
GraphicsAMD Radeon RX 460 or NVIDIA Geforce 1050
DirectXVersion 11
Storage14 GB available space
Additional NotesPlease note that 32-bit operating systems will not be supported.

macOS minimum

OSmacOS 10.13.5
Processor2.0Ghz Intel Core i5
Memory8 GB RAM
Graphics1GB Nvidia 650M, 2GB AMD Radeon R9 M290, Intel Iris 5100 or better (see notes for more details).
Storage28 GB available space
Additional NotesThe game is supported on the following Macs. To check your Mac model and when it was released, select About This Mac from the Apple menu on your menu bar. * All Mac Minis since Late 2014
Note* All 13” MacBook Pros released since 2013
Note* All 15" MacBook Pros released since Mid 2012 with a 1GB graphics card or better (1)
Note* All 21.5” iMacs released since Late 2013
Note* All 27” iMacs released since Late 2013 (2)
Note* All 27" iMac Pro's
Note* All Mac Pros released since Late 2013
Note1. Mid 2015 models with an AMD Radeon R9 M370X are not supported.
Note2. Late 2012 models with Nvidia 675 or Nvidia 680 graphics are also supported.
Note* All Mac Mini's since Late 2012
Note* All Macbooks released since Early 2015
Note* All Macbook Airs released since Mid 2012
Note* All 13" Macbook Pros released since Mid 2012
Note* All 21.5” iMacs released since Early 2013

FAQ

What graphics card do I need for Life is Strange: Before the Storm?

Minimum: AMD Radeon R7 250 or NVIDIA Geforce GTX 650. Recommended: AMD Radeon RX 460 or NVIDIA Geforce 1050.

How much RAM does Life is Strange: Before the Storm need?

Life is Strange: Before the Storm needs 3 GB RAM at minimum, 6 GB RAM recommended.

How big is Life is Strange: Before the Storm?

Life is Strange: Before the Storm requires 14 GB available space.

Does Life is Strange: Before the Storm run on Mac or Steam Deck/Linux?

Yes, there is a native macOS version. A native Linux build is available.