Update (October 2026): SimShare is now called SyncCrate. This post is rewritten for the current version, and the old website link is replaced with the new one.

Hi everyone,

This started because my girlfriend has over 4000 mods, and every time we wanted to play together one of us was missing something or had an older version. USB sticks, Google Drive, comparing folders by hand... you know how it goes. I built a small tool for the two of us, and it grew into something I think is useful for more people.

What it does
One of you hosts, the other connects, and SyncCrate compares both Mods folders file by file. It shows you a list of what's missing or different, and only copies those files. Nothing on your PC changes until you've looked at the list and clicked Sync Now. You can also include Saves, Tray and Screenshots, or leave them out.

What it can do now
- Works over the internet. The host gets a join code, the friend pastes it, done. No VPN or port forwarding needed. Same wifi still works too, and that's the fastest.
- Your CC shows its thumbnail and real name (read from inside the .package), instead of a wall of file names. There's a grid view to browse it by picture.
- If a creator doesn't allow reuploads or asks for downloads from their own page, you can mark their files as "share as a link". Your friend then gets the creator's download page instead of the file. I don't want the tool to be a way around creators.
- It can find a broken mod for you. It does the 50/50 method automatically: turns half off, you test, it narrows it down. With thousands of mods that's still only around a dozen rounds.
- It checks for the usual problems: script mods more than one folder deep, the same script twice, a missing Resource.cfg, Tray files saved into Mods, and outdated scripts after a patch.
- Shared saves for legacies or rotating households: one person takes the save, plays, gives it back, so you never end up with two versions of the same family.
- Backups before a sync, and an undo button for the last sync if something goes wrong.

Some honest notes
- Packs aren't copied (those come from EA), but it shows which packs each PC has and flags CC that needs a pack you're missing.
- It's a hobby project by one person. It works well for us, but I'm sure there are setups I haven't seen yet. If something breaks, there's a "Copy diagnostics" button in the app; paste that into a GitHub issue or reply here.
- Windows will probably show a SmartScreen warning when you install it, because I can't afford a code-signing certificate. Click "More info" and then "Run anyway". The whole code is public, so anyone can check what it does.

It's free, open source (MIT), with no account, no ads and no cloud. Files go straight from one PC to the other. Windows, Mac and Linux.

Website and Sims 4 guide: https://synccrate.app/games/sims-4
Download: https://github.com/stixez/SyncCrate/releases/latest
Source code: https://github.com/stixez/SyncCrate

I'd really like feedback, especially from people with big Mods folders or who play with friends a lot. Feature requests are welcome too.

Small update for anyone who finds this thread: SimShare is called SyncCrate now, and I rewrote the first post for the current version. The old website link was dead, sorry about that, the new one is https://synccrate.app/games/sims-4

Biggest changes since I first posted: it works over the internet with a code now (no VPN needed), Tray and saves can sync too, and CC shows its thumbnail and real name. Still free, no account. Happy to answer questions here.