ModsFinder

UnionLib

by Stereowalker

Developers who ship one codebase for several loaders can use UnionLib as a shared base, and it also supplies a configuration system.

FabricForgeNeoForgeQuiltClient or server, optionalAll rights reserved1.16.1 – 26.2

What it does

UnionLib is a library, not a player-facing mod. It is meant for developers who want to build multi-loader mods with less duplicated work, and for mod authors who want to integrate their own mod with it. It works on either side of a connection, and neither the server nor the client needs it. It is published for Fabric, Forge, NeoForge and Quilt, with files covering 1.16.1 – 26.2 (15 release versions), and the code is licensed under All rights reserved, so it is not open source.

The library is required by six catalog mods, including Controller Support Mod, Survive, Reforged (formerly Tiered), Actual Fishing and Violent Villagers, so anyone installing those needs UnionLib as well. The latest files for every loader are 26.2-13.3, dated 2026-09-06.

Key features

  1. Multi-loader development base

    Shared helpers reduce the code a developer must rewrite when targeting several loaders from one project.

  2. Configuration system

    A configuration system with a deliberately simple structure, aimed at mods that need only basic settings.

  3. Developer integration

    Mod authors can connect their own mod to UnionLib to use its helpers and configuration system.

Compatibility

Latest build for each game version and loader.

26.x1 of 1 version with builds
26.226.2-13.3-Fabric26.2-13.3-Forge26.2-13.3-NeoForge26.2-13.3-Fabric
1.21.x4 of 4 versions with builds
1.21.111.21.11-12.2-FabricNot available1.21.11-12.2-NeoForge1.21.11-12.2-Fabric
1.21.10Not availableNot available1.21.10-12.2-NeoForgeNot available
1.21.11.21.1-13.3-Fabric1.21.1-13.3-Forge1.21.1-13.3-NeoForge1.21.1-13.3-Fabric
1.211.21.1-13.3-Fabric1.21.1-13.3-Forge1.21.1-13.3-NeoForge1.21.1-13.3-Fabric
1.20.x3 of 3 versions with builds
1.20.61.20.6-12.2-Fabric1.20.6-12.2-Forge1.20.6-12.2-NeoForge1.20.6-12.2-Fabric
1.20.11.20.1-13.3-Fabric1.20.1-13.3-Forge1.20.1-13.3-Forge1.20.1-13.3-Fabric
1.20Not available1.20-10.0.0-ForgeNot availableNot available
1.19.x5 of 5 versions with builds
1.19.4Not available1.19.4-10.2.6-ForgeNot availableNot available
1.19.31.19.3-10.2.6-Fabric1.19.3-10.2.6-ForgeNot availableNot available
1.19.21.19.2-10.2.6-Fabric1.19.2-10.2.6-ForgeNot availableNot available
1.19.11.19.2-10.2.6-FabricNot availableNot availableNot available
1.191.19.2-10.2.6-FabricNot availableNot availableNot available
1.18.x1 of 1 version with builds
1.16.x1 of 1 version with builds
ReleaseBetaAlphaNot available

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

Required by 6 mods

Controller Support Mod1.19.2 – 1.21.1Survive1.18.2 – 26.2Reforged (formerly Tiered)1.19 – 26.2Actual Fishing1.21 – 1.21.11Violent Villagers1.19 – 1.20.6Burden Of Time1.19 – 26.2

How it compares

Full comparison

TritiumConfiguration is also a configuration library for Fabric, Forge, NeoForge and Quilt, open source under the MIT License, with files for 1.19 – 1.21.10. NAIF API is a client and server library under the MIT License for Fabric, NeoForge and Quilt, covering 1.21 – 1.21.11, and it is not open source.

ModLoadersGame versionsEnvironmentUpdated
UnionLibFabric, Forge, NeoForge and Quilt1.16.1 – 26.2Client or server, optional2026-09-06
TritiumConfigurationFabric, Forge, NeoForge and Quilt1.19 – 1.21.10Client or server, optional2025-11-19
NAIF APIFabric, NeoForge and Quilt1.21 – 1.21.11Client and server2026-05-08

Questions

Does a player need to install UnionLib directly?

Only if a mod they use requires it. Six catalog mods, such as Actual Fishing, depend on it, and those mods need UnionLib installed next to them.

Which loaders does UnionLib support?

Fabric, Forge, NeoForge and Quilt. Latest files for each loader are 26.2-13.3, dated 2026-09-06.

In the catalog

UnionLib is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 13,894 mods support Minecraft 26.2.

Library mods3,514Fabric modsMods for 26.213,894

More from Stereowalker

All projects
Controller Support Mod1.19.2 – 1.21.1Survive1.18.2 – 26.2Reforged (formerly Tiered)1.19 – 26.2Actual Fishing1.21 – 1.21.11Violent Villagers1.19 – 1.20.6Burden Of Time1.19 – 26.2

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

This is an API mod, so it provides nothing for users and is intended for developers to use. This mod only does two things, first is making developing multi-loader mods as simple as possible and the second is a configuration system that's very intuitive to use and lacks complexity. I'm sure that nothing this mod…
Stereowalker, on the Modrinth page

Official listing

Owner
Stereowalker
Published
2022-12-26
Updated on Modrinth
2026-09-06
Facts verified
2026-10-15

Tags

Library
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