The name Lepton appeared on Steam and SteamDB just a few weeks after Valve unveiled the Steam Frame headset, which will be able to run Android apps.
In our new interview with Valve’s Pierre-Loup Griffais, he mentioned the Frame uses “a similar compatibility layer as Proton, just targeted at Android.”
[Image: https://platform.theverge.com/wp-content/uploads/sites/2/2025/12/steam-lepton-header.jpg?quality=90&strip=all]
After finishing to read the interview it does indeed sound different, but it is odd that this isn’t open-source somewhere like Proton and Fex always were.