ModsFinder

FleiSync

by Flei123

FleiSync keeps a server's mod list in step with each player's client, so players who join a modded server do not have to install each mod by hand.

FabricForgeNeoForgeQuiltServer-side onlyMIT License1.16.1 – 26.3

What it does

A server runs FleiSync and serves its mod files over HTTP from a manifest that lists the installed mods with their hashes, the Minecraft version and the loader. The ordinary game port stays unchanged, and FleiSync answers on an extra port that forwards to the server. A client connects through FleiLauncher, which needs only the server IP to fetch and match the mods automatically, with no direct connection to the server and a central FleiTec service in between.

FleiSync is server-side only, so players do not install it and the server needs nothing on the client. Each jar covers one loader, and the same jar works across the listed versions. Files are published for Fabric, Forge, NeoForge and Quilt, across 39 release versions 1.16.1 – 26.3, and the mod is released under the MIT License, not open source. The central service also handles account and telemetry data.

Key features

  1. Automatic mod sync

    FleiLauncher fetches the server's mod set on connect, matching the Minecraft version and loader.

  2. Manifest and file endpoints

    A manifest endpoint lists mods with hashes, and a separate endpoint serves the mod files themselves.

  3. Separate sync port

    Sync traffic uses an extra port, so the normal game port keeps carrying ordinary Minecraft traffic.

Compatibility

Latest build for each game version and loader.

26.x5 of 5 versions with builds
26.31.1.0+fabricNot availableNot availableNot available
26.21.1.0+fabric1.1.0+forge1.1.0+neoforgeNot available
26.1.21.1.0+fabric1.1.0+forge1.1.0+neoforgeNot available
26.1.11.1.0+fabricNot availableNot availableNot available
26.11.1.0+fabricNot availableNot available1.1.0+quilt
1.21.x12 of 12 versions with builds
1.21.111.1.0+fabric1.1.0+forge1.1.0+neoforgeNot available
1.21.101.1.0+fabric1.1.0+forge1.1.0+neoforgeNot available
1.21.91.1.0+fabricNot available1.1.0+neoforgeNot available
1.21.81.1.0+fabric1.1.0+forge1.1.0+neoforgeNot available
1.21.71.1.0+fabricNot availableNot availableNot available
1.21.61.1.0+fabricNot availableNot availableNot available
1.21.51.1.0+fabric1.1.0+forge1.1.0+neoforgeNot available
1.21.41.1.0+fabric1.1.0+forge1.1.0+neoforgeNot available
1.21.31.1.0+fabric1.1.0+forge1.1.0+neoforgeNot available
1.21.21.1.0+fabricNot availableNot availableNot available
1.21.11.1.0+fabric1.1.0+forge1.1.0+neoforge1.1.0+quilt
1.211.1.0+fabric1.1.0+forge1.1.0+neoforgeNot available
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
1.17.x2 of 2 versions with builds
1.16.x5 of 5 versions with builds
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Who it’s for: Server owners who run modded worlds and want players to receive the mod set automatically, and players who join those servers through FleiLauncher.

Questions

Does a player need to install FleiSync?

No. Server owners install it, and players connect with no copy of their own.

Which loaders does FleiSync support?

Fabric, Forge, NeoForge and Quilt. Each loader has its own jar, and the same jar works across the versions it lists.

Which game versions have files?

Files exist for 39 release versions 1.16.1 – 26.3, with 1.1.0 as the latest release on each loader.

Does FleiSync change the normal game port?

No. Sync traffic goes through an extra port, and the normal game port keeps carrying standard Minecraft traffic.

In the catalog

FleiSync is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 8,071 mods support Minecraft 26.3.

Management mods8,016Fabric modsMods for 26.38,071

Similar mods

Cherished Worlds1.12.2 – 26.3Default Options1.18 – 26.3Axiom1.20 – 26.3Resourcify1.8.9 – 26.3Rebind Narrator1.16.1 – 26.1.2Paxi1.19.2 – 26.1.2

What the author says

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 —…
Flei123, on the Modrinth page

Official listing

Owner
Flei123
Published
2026-07-07
Updated on Modrinth
2026-10-10
Facts verified
2026-10-15

Tags

ManagementUtility
Open on ModrinthCompare