#FEX: Emulate x86 Programs on ARM64

FEX allows you to run x86 applications on ARM64 Linux devices, similar to qemu-user and box64. It offers broad compatibility with both 32-bit and 64-bit binaries, and it can be used alongside Wine/Proton to play Windows games.

It supports forwarding API calls to host system libraries like OpenGL or Vulkan to reduce emulation overhead. An experimental code cache helps minimize in-game stuttering as much as possible. Furthermore, a per-app configuration system allows tweaking performance per game, e.g. by skipping costly memory model emulation. We also provide a user-friendly FEXConfig GUI to explore and change these settings.

#Prerequisites

FEX requires ARMv8.0+ hardware. It has been tested with the following Linux distributions, though others are likely to work as well:

Arch Linux
Fedora Linux
openSUSE
Ubuntu 22.04/24.04/24.10/25.04

An x86-64 RootFS is required and can be downloaded using our FEXRootFSFetcher tool for many distributions. For other distributions you will need to generate your own RootFS (our wiki page might help).

#Quick Start

#For Ubuntu 22.04, 24.04, 24.10 and 25.04

Execute the following command in the terminal to install FEX through a PPA.

curl --silent https://raw.githubusercontent.com/FEX-Emu/FEX/main/Scripts/InstallFEX.py | python3

This command will walk you through installing FEX through a PPA, and downloading a RootFS for use with FEX.

#For other Distributions

Follow the guide on the official FEX-Emu Wiki here.

#Navigating the Source

See the Source Outline for more information.