CurseForge · Minecraft mod

MultiForge Client

A debug/config client for the MultiForge Server.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which MultiForge Client release should I use?

Updated 28 days ago

Latest stable file multiforge-client-1.5.1.jar

Game version 1.21.1

Loader NeoForge

MultiForge Client multiforge-client-1.5.1.jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is MultiForge Client required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say

Dedicated server Source doesn’t say

Loader for this release NeoForge

Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does MultiForge Client multiforge-client-1.5.1.jar need?

multiforge-client-1.5.1.jar. Change the file and its required mods may change too.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add MultiForge Client without breaking your instance.

Built for MultiForge Client multiforge-client-1.5.1.jar. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use multiforge-client-1.5.1.jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
02
Bring the mods it needs

This file does not list any required mods. Do not add a library just because a different file uses it.
03
Put it on the correct side

The project page does not say whether this file belongs on the client, dedicated server, or both.
04
Pick the file you checked

Use the “Get this file” button beside multiforge-client-1.5.1.jar. It opens that exact file at the source.

About this project

What does MultiForge Client add?

MultiForge Debug Client

Live in-world visualisation for MultiForge servers. Folia-style regionised multithreaded drop-in replacement for the NeoForge dedicated server.

Install this mod on your NeoForge client and activate the hotkey to see what a MultiForge server is doing under the hood. MultiForge is a drop-in NeoForge replacement, so any NeoForge client can connect without this mod.

What it shows

F3-style HUD. A live three-line status block: server build/protocol/tick rate, region count and estimated TPS, worst region's p95 MSPT, count of recent ownership/reroute warnings.
Chunk-border renderer. Coloured borders around every chunk, coded by region ownership — see exactly where one worker's region ends and the next begins.
Tick-cost heatmap. Per-chunk overlay coloured by how expensive the chunk was to tick. Spot mob farms and entity swarms eating one worker's tick budget.
Region-pin renderer. When an op has locked region boundaries with /multiforge region pin …, the pinned rectangle is drawn as a labelled box in the world.

How it activates

Auto-connects to any MultiForge v1.3.14+ server that advertises the multiforge:debug/v1 channel. Sends a SUBSCRIBE handshake on join; all overlays fill in within one second.

Stays completely inert on stock NeoForge servers — the channel is OPTIONAL, so connecting to any NeoForge 1.21.1 server always succeeds. Safe to keep in your mods/ folder permanently.

Controls

Press F6 (remappable under Options → Controls → MultiForge Debug) to toggle every overlay on/off at once. Chat shows MultiForge overlays: on/off as feedback.

Requirements

NeoForge 21.1.90 or newer (tested against 21.1.249)
Java 21

Compatibility

Any NeoForge 1.21.1 mod loadout — this mod adds one payload channel and a handful of render event handlers, nothing that would collide with other mods.
Works alongside JEI, Sodium, shader mods, and any other client mod.
No client-side config file to edit.

License

GPL-3.0-only. Free software. No token, no activation, no phone-home.