Sims 4 Mod Manager by GameTimeDev (S4MM)

S4MM at a glance

What it does

• Shows your CC. Thumbnails where a file has one, missing thumbnails pulled from the game's cache, and a 3D viewer for CAS and Build/Buy items.
• File management. Delete, move and rename files, create subfolders, and activate or deactivate files without leaving the app.
• Duplicate Finder. Compares file contents, so it catches the same file saved under two names.
• ID Conflicts. Lists CC items that share the same in-game ID.
• Polycount Analyzer. Finds high-poly items that can hurt performance.
• CurseForge integration. Browse and install CurseForge mods, update them, and detect CurseForge mods already in your folder.
• Extras. Custom loading screens, and a CC-Swiper phone app that syncs with the manager.
• Direct Download links. A creator can publish a link that installs a file straight into the manager. These accept .package files only, up to 50 MB, and block scripts and executables.

How to get and install it

1. Open s4mm.gametimedev.de/downloads. The old address gametimedev.de/S4MM redirects there.
2. Windows: download the installer. Mac: pick Apple Silicon or Intel to match your Mac.
3. Install it like any app. It does not go inside the Mods folder; the author says it can be installed anywhere and only needs access to that folder.
4. Quit The Sims 4 before you move or delete files with it.

Updating is simple: the installer replaces the old version and keeps your settings, so there is no need to uninstall first. The author also says the manager usually does not need an update when the game gets a patch.

More on platforms: all official download links and the Mac version.

Is S4MM safe?

Downloaded from the official site, yes. The author states that every Windows and Mac release is digitally signed, and warns never to run a copy that is unsigned or comes from somewhere else. The only sources he names are the official website and his Discord server.

Some antivirus programs flag it. The author's explanation is that he is not a well-known developer, and he suggests checking the digital signature if you are unsure. Sites offering a "premium", "pro" or "cracked" S4MM are not his.

Limits to know before you rely on it

• It is not lightweight. The author says it should run on lower-end systems, but that large mod folders can reduce performance and cause crashes.
• It shows ads. The author says the ads are what let him keep working on it. A premium option without ads is on his 2026 roadmap, not a finished feature.
• It does not know which mods are outdated. Nothing in its feature list checks a mod against the current game patch. After a patch you still check each creator's page. See finding broken CC.
• Updates cover CurseForge mods only. Files from Patreon, Tumblr or a creator's site are organized, not updated.
• Release labels say Beta. Every build in the current download list is marked Beta, and release timing varies because one person maintains it.

For a quick look at a folder without installing anything, the Mods folder inventory on the main page lists every file in the browser.

FAQ