FleiSync
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
Automatic server-side mod sync for the FleiLauncher: the server serves its mods over HTTP, the client syncs by just entering the server IP. No central…
⬇ Download on ModrinthFleiSync
Automatic mod sync for Minecraft servers — no central service.
FleiSync runs on the server and exposes the installed mods through a tiny built-in HTTP server (default: game port + 1). The FleiLauncher client only needs the server IP and then syncs mods + versions fully automatically — directly client ↔ server, with no FleiTec service in between.
Features
- Serves
/fleisync/manifest(mod list + hashes) and/fleisync/mods/<file> - Client pulls missing/updated mods straight from the server
- Port configurable in
config/fleisync.properties - No account, no central server, no telemetry
Note
Pure server-side mod. You do not install FleiSync on the client — the FleiLauncher handles the sync there (client_side: unsupported).
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as fleisync-1.0.0.jar — drop this file into the mods folder
- Download size: 9 KB
- Download link checked 23 Sept 2026 — working
These come from our own check of the pack file, not from the source page.