Not just Proton: Getting to know Valve's new SteamOS compatibility layers

Valve detailed two new SteamOS compatibility layers: FEX emulates x86 instructions on ARM chips, and Lepton runs Android APKs in a container. 52 of the first 120 'Great on Frame' games run on Steam Frame as Android apps via Lepton.

• FEX is a fex-emu port, emulates x86(-64) on ARM and caches code
• Lepton is a Waydroid extension to run Android APKs on SteamOS
• 52 of 120 'Great on Frame' games run via Lepton as Android builds
• Valve is exploring SteamOS for other ARM devices