CurseForge · Minecraft mod
PolyLib
A Minecraft lib used for all of CreeperHosts mods
Quick answer
Which PolyLib release matches 1.21.9 Fabric?
PolyLib 2109.1.0 [Fabric] targets 1.21.9, 1.21.10 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. 1 required mod needs a matching file.
About this project
What does PolyLib add?
"PolyLib," developed by CreeperHost Ltd., is a compact Minecraft library mod focused on providing a collection of helper classes. These classes are designed to simplify various aspects of mod development, offering tools for easier GUI creation and other development enhancements to improve efficiency and user experience.
PolyLib WAS built using Architectury and is available for NeoForge, Forge, and Fabric, As of Minecraft 26.1.2 Architectury is no longer required.
PolyLib is Open source and available on Github.
Mods that require PolyLib
Project description from CurseForge.
Where it goes
Is PolyLib required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does PolyLib 2109.1.0 [Fabric] need?
2109.1.0 [Fabric] on 1.21.9 Fabric. Every mod below is checked against that same setup.
Install Architectury API, Fabric API first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match. 1 comes through another mod in the chain.
1 extra mod was pulled in by another dependency. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add PolyLib without breaking your instance.
Built for PolyLib 2109.1.0 [Fabric] on 1.21.9 Fabric. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 2109.1.0 [Fabric]. It targets 1.21.9, 1.21.10 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Architectury API, Fabric API first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match. 1 comes through another mod in the chain.
- 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 2109.1.0 [Fabric]. It opens that exact file at the source.
Pick your setup
PolyLib by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.2
2 loader builds26.1.2
2 loader builds1.21.11
2 loader builds1.21.10
2 loader builds1.21.9
2 loader builds1.21.8
2 loader builds1.21.7
2 loader builds1.21.6
2 loader builds1.21.5
2 loader builds1.21.4
2 loader builds1.21.3
2 loader builds1.21.1
2 loader buildsShowing the newest 12 of 18 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
PolyLib versions and loaders
2109.1.0 [Fabric]
polylib-2109.1.0.184-fabric.jar
1 Nov 2025
Looking for an older file? The official CurseForge project page is in Resources.