ModsFinder

YAC

by hutzdog

YAC is a Fabric library mod by hutzdog, providing a layer system and a multiblock system for other mods to build on.

FabricServer-side onlyMozilla Public License 2.0Open source1.21.4

What it does

YAC, short for Yet Another Coremod, is a library that other mods can depend on for a layer system and a simple multiblock system. It runs on the server only, so players join without installing it. The mod requires Fabric API and Fabric Language Kotlin, and files are published for Fabric 1.21.4, with 0.1.1 as the latest build from 2025-01-30. It is released under the Mozilla Public License 2.0 and is open source.

Key features

  1. Layer system

    Provides a layer system that mods can use to organize content in stacked or ordered groups.

  2. Multiblock system

    Offers a simple multiblock system that lets dependent mods define structures made of several connected blocks.

  3. Library role

    Works as a dependency for other Fabric mods rather than adding gameplay content on its own.

Compatibility

Latest build for each game version and loader.

1.21.40.1.1
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 2

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required
Fabric Language KotlinThis is a mod that enables usage of the Kotlin programming language for Fabric mods.
Required

How it compares

Full comparison

LMCommonCore is a library that covers Fabric, Forge and NeoForge for 1.20.1 – 1.21.1, and it is open source under the GNU General Public License v3.0 only. Utilize is a Fabric library for 1.21 – 26.2 that is client-side only and open source under the MIT License. Neither is needed for YAC, which targets only 1.21.4.

ModLoadersGame versionsEnvironmentUpdated
YACFabric1.21.4Server-side only2025-01-30
LMCommonCoreFabric, Forge and NeoForge1.20.1 – 1.21.1Client and server2026-03-09
UtilizeFabric1.21 – 26.2Client-side only2026-08-07

Questions

Does YAC need Fabric API?

Yes. Fabric API is a required dependency and must be installed alongside YAC on a Fabric 1.21.4 server.

Does YAC need Fabric Language Kotlin?

Yes. Fabric Language Kotlin is also required, so it must be present on the server with YAC.

In the catalog

YAC is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 17,979 mods support Minecraft 1.21.4.

Library mods3,514Fabric modsMods for 1.21.417,979

More from hutzdog

All projects
YAQOL1.19 – 1.19.2LILibPow1.17.1

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

Yet Another Coremod is Hutzdog's library mod.
hutzdog, on the Modrinth page

Official listing

Owner
hutzdog
Published
2025-01-08
Updated on Modrinth
2025-01-30
Facts verified
2026-10-15

Tags

Library
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