# Modders bring Steam Frame build of SteamOS and all of its translation layer goodness to Mac

- URL: https://talkfuse.com/story/modders-bring-steam-frame-build-of-steamos-and-all-of-its-translation-layer-goodness-to-mac/
- Published: 2026-11-03T13:55:31+00:00
- Updated: 2026-11-06T11:08:19+00:00
- Original publisher: PC Gamer
- Original article: https://www.pcgamer.com/software/operating-systems/modders-bring-steam-frame-build-of-steamos-and-all-of-its-translation-layer-goodness-to-mac/
- Topics: Gaming

## Key points

- FX Steam Launcher runs SteamOS in a virtual machine on Apple Silicon Macs.
- Compatibility layers can run some Windows games, with macOS 26 needed for KosmicKrisp.
- Tests showed strong frame rates, though at limited resolutions and with uneven results.

## Summary

An open-source project called FX Steam Launcher brings a version of SteamOS to Apple Silicon Macs, offering access to Windows games through compatibility software including Proton 11 and FEX. It could broaden Mac gaming options, but SteamOS runs in a virtual machine and the setup depends on several translation layers.

The launcher supports Apple Silicon Macs running macOS 15 or later, while the KosmicKrisp graphics layer requires macOS 26 or later. In tests on an M4 Max, YouTube creator ETA Prime reported more than 70 frames per second in The Witcher 3, Stellar Blade and Left 4 Dead 2; the latter exceeded 200, but Stellar Blade ran at 800p and results varied by game.

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