At a glance
Arma 3 has a Mac version: Steam sells it for macOS and its requirements list Apple chips. Install it in Steam for Mac; it doesn’t need Uncork.
Arma 3 came out on Steam on 12 September 2013, made by Bohemia Interactive.
What your Mac needs
The Mac requirements list Apple chips.
Minimum macOS in the Steam requirements: 11.
Steam requirements list at least 8 GB of memory for Arma 3; 16 GB recommended.
Allow about 45 GB of disk space for the Mac version.
How to play
Open Steam for Mac and install Arma 3 as usual.
If the Mac version will not start, you can install the Windows version through Uncork: download Uncork, sign in to Steam and install Arma 3 from there (50 GB). We have not tested it ourselves.
The Windows version through Uncork needs a Mac with Apple Silicon (M1 or newer).
Arma 3 uses DirectX 10: Uncork renders it with D3DMetal.