FleiSync
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 service.
- Loaders
- FabricNeoForgeForgeQuilt
- Downloads on Modrinth
- 147
- Followers on Modrinth
- 1
- versions
- 5
- Updated
- October 10, 2026Oct 10
- Published
- in 2026
At a glance
Install on the server only; players don't need it
FleiSync
Automatic mod sync for Minecraft servers — no central service.
FleiSync runs on the server. It answers on the normal game port (no extra port, no port forwarding) and lists the installed mods. The FleiLauncher client only needs the server IP and then syncs mods, Minecraft version and loader fully automatically — directly client ↔ server, with no FleiTec service in between.
Supported
Tested on real dedicated servers (started, manifest answered, normal player connections unaffected):
- Fabric 1.16.1 – 26.3 (every release in between)
- Quilt 1.20.1, 1.21.1, 26.1
- NeoForge 1.20.4 – 26.2
- Forge 1.18.2 – 26.2
One jar per loader — the same jar works on all listed versions.
How it works
GET /fleisync/manifest— mod list with hashes, Minecraft version, loader + version- `GET /fleisync/mods/` — the mod files
- Everything else on the port stays normal Minecraft traffic
- No account, no central server, no telemetry
Note
Pure server-side mod. Do not install it on the client — the FleiLauncher handles the sync there.
FAQ
How to install FleiSync?
Install Fabric for your Minecraft version, download FleiSync for the same version and loader, put the file into the mods folder and launch the game with the loader profile.
Which Minecraft versions does FleiSync support?
FleiSync has builds for Minecraft 1.16.1–26.3.
Is FleiSync needed on the server?
Server only — players don't need to install it
