Where does Steam run?
Steam is a game store app by Valve. Official site.
Official platforms: Windows, Mac, Linux
Valve offers a Windows installer and lists macOS, SteamOS and ChromeOS under "Also available on". On Chromebooks, Steam has only ever been a beta, and its current status is disputed (see the Chromebook record).
Source: Valve · Verified
Steam by platform
| Platform | Official | Best route |
|---|---|---|
| Windows | Official version available | - |
| Mac | Official version available | - |
| Linux | Official version available | - |
| iPad | Not checked yet | - |
| Android | Not checked yet | - |
| Chromebook | Official beta | Cloud gaming service: works |
Platforms marked "not checked yet" have no RunsWhere record. The official platform list above comes from Valve.