ModsFinder

Guithium

by BillyGalbreath

Guithium is a library that lets Paper and Purpur plugins open GUIs on Fabric clients.

FabricServer required, client optionalMIT LicenseOpen source1.21.5

What it does

Guithium connects plugins running on Paper or Purpur with players who use the Fabric loader, so a plugin can display graphical interfaces on a player's screen. It is a server-side mod: only the server needs it, and players join without installing anything beyond Fabric API, which is required. Source code, an issue tracker and a wiki are publicly available, and the project is open source under the MIT License. Files cover Minecraft 1.21.5 only.

Key features

  1. Plugin-driven GUIs

    Paper plugins can send interface windows that appear on the screens of Fabric players.

  2. Server-side install

    Installing the library on the server is enough, since clients need nothing extra beyond Fabric API.

  3. Public source code

    The source code, issue tracker and wiki are publicly available under the MIT License.

Compatibility

Latest build for each game version and loader.

No stable releases
Every published file is a beta or alpha build.
1.21.50.1.0
ReleaseBetaAlphaNot available

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

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

How it compares

Full comparison

Data Driven GUIs is a Fabric library that works on client and server, released under the MIT License, with files for 1.21 – 1.21.5. Datapack UIs is server-side only, open source and covers 1.21.4 – 1.21.5 on Fabric. Guithium targets Paper and Purpur plugins on 1.21.5 alone.

ModLoadersGame versionsEnvironmentUpdated
GuithiumFabric1.21.5Server required, client optional2025-05-26
Data Driven GUIsFabric1.21 – 1.21.5Client and server2025-04-25
Datapack UIsFabric1.21.4 – 1.21.5Server-side only2025-03-26

Questions

Does Guithium need Fabric API?

Yes. Fabric API is a required dependency and must be installed alongside Guithium.

Does a player need to install Guithium?

No. Only the server runs the library, and players can join the server without it, since clients may add it but do not need it.

In the catalog

Guithium is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 15,307 mods support Minecraft 1.21.5.

Library mods3,514Fabric modsMods for 1.21.515,307

Similar mods

Fabric API1.14 – 26.3Cloth Config API1.14 – 26.3YetAnotherConfigLib (YACL)1.19 – 26.3Architectury API1.16.5 – 26.3Just Enough Items (JEI)1.8 – 26.3Geckolib1.12.2 – 26.3

What the author says

Guithium allows Paper plugins to add GUIs to Fabric clients.
BillyGalbreath, on the Modrinth page

Official listing

Owner
BillyGalbreath
Published
2025-05-10
Updated on Modrinth
2025-05-26
Facts verified
2026-10-15

Tags

LibraryUtility
Open on ModrinthCompare