Frequently asked questions

Both answer the same question with the same data. If you buy and play through the Steam app on your Mac, get CrosTem for Mac. If you browse the store in Chrome, Brave or Edge, get the extension. They coexist happily — run either, or both.

Yes — free and open source, under the GPL-3.0-or-later license. No accounts, no purchases, no ads.

Three community sources: the CodeWeavers CrossOver compatibility database, AppleGamingWiki and Are We Anti-Cheat Yet?. Steam's own appdetails API supplies the native-Mac flag. CrosTem only reads their public pages and APIs.

It is community-reported data, read conservatively: one bad signal outweighs a good one, and when sources disagree the widget says so and shows each source's raw status. Treat it as strong guidance, not a guarantee.

Anti-cheat is the main blocker for multiplayer games under CrossOver. Are We Anti-Cheat Yet? tracks Linux/Proton support, which is indicative for the Mac: a Denied or Broken status always forces a red verdict.

Games that ship a native macOS build get a “Native on macOS” badge with five stars and an architecture tag: M Series (Apple Silicon) or Intel (Rosetta 2 on M).

None. No telemetry, no analytics, no accounts. The extension's only permission is storage; the Mac app keeps everything in one local folder. See the privacy policy for the full picture.

Yes. When a match is ambiguous the widget shows the candidates; pick the right one once and CrosTem remembers it for that game everywhere. Corrections can be exported and imported.

No. CrosTem is an independent project and is not affiliated with, endorsed by or sponsored by Valve, CodeWeavers, AppleGamingWiki, Are We Anti-Cheat Yet? or Apple.

All 30 languages Steam supports. The injected UI follows the language of the Steam page you're viewing; statuses quoted from the sources (“Runs Great”, “playable”…) stay untranslated because they are citations.

CrosTem for Mac is signed but not notarized — notarization requires a paid Apple developer account. macOS is cautious the first time: approve it once (“Open Anyway” on macOS 15, right-click → Open on 13 or 14) and it opens like any other app from then on.

The app asks Steam to restart with its built-in debugging channel open, attaches locally and draws verdicts inside the client. That channel is localhost-only and lasts one session — and while it's open, other local processes could drive Steam too, which is why CrosTem only enables it when you ask. The code is public if you want to check.

Any Chromium browser that installs Manifest V3 extensions: Chrome, Brave, Edge and friends. The extension runs on the Steam store website — for the Steam client itself there is CrosTem for Mac.

The store listing is on its way. Until it's live, the beta installs manually in about a minute — the install guide walks through the four steps, and the extension works identically once loaded.