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Universal Mod CoreMinecraft mod for 1.21.4

A minecraft/loader agnostic modding API

client and servernewest supported release 1.21.4
Latest version
1.21.4-neoforge-1.3.1
Loaders
NeoForge, Forge
Licence
LGPL-2.1-only
Downloads
175.2k
Updated
2 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Universal Mod Core servers

One click and Universal Mod Core is installed with the right loader, on hardware built for it.

  • 1.21.4
  • NeoForge
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version Universal Mod Core declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.4NeoForge, Forge21+declared3 Dec 2024
1.21.1Forge, NeoForge21+declared8 Aug 2024
1.20.1Forge, NeoForge17+declared12 Jun 2023
1.19.4NeoForge, Forge17+declared14 Mar 2023
1.18.2NeoForge, Forge17+declared28 Feb 2022
1.17.1Forge, NeoForge16+declared6 Jul 2021
1.16.5NeoForge, Forge8+declared14 Jan 2021
1.15.2NeoForge, Forge8+declared17 Jan 2020
1.14.4NeoForge, Forge8+declared19 Jul 2019
1.12.2Forge, NeoForge8+declared18 Sept 2017
1.11.2NeoForge, Forge8+declared21 Dec 2016
1.10.2NeoForge, Forge8+declared23 Jun 2016
1.7.10NeoForge, Forge8+declared14 May 2014

Download

From Universal Mod Core’s own host. Nothing is re-hosted here.

Browse 57 indexed releases

Most recently published release

1.21.4-neoforge-1.3.1beta6 Sept 2026

UniversalModCore-1.21.4-neoforge-1.3.1.jar · 0.9 MB · for 1.21.4 · NeoForge

Download this release
583234d804e6…
Older versions24
  • 1.21.1-neoforge-1.3.16 Sept 20261.21.10.9 MB67dca315ebec…Get
  • 1.20.1-forge-1.3.16 Sept 20261.20.12.6 MB52a6e4a965a3…Get
  • 1.19.4-forge-1.3.16 Sept 20261.19.42.6 MBf86873dd1178…Get
  • 1.18.2-forge-1.3.16 Sept 20261.18.22.6 MBf695b7d396f2…Get
  • 1.17.1-forge-1.3.16 Sept 20261.17.12.5 MB8f16a6c4a511…Get
  • 1.16.5-forge-1.3.16 Sept 20261.16.52.5 MB194ebb9aebfa…Get
  • 1.15.2-forge-1.3.16 Sept 20261.15.22.4 MB9e99d57c367a…Get
  • 1.14.4-forge-1.3.16 Sept 20261.14.42.4 MB7a6e233a918c…Get
  • 1.12.2-forge-1.3.16 Sept 20261.12.21.6 MB1100580acf06…Get
  • 1.11.2-forge-1.3.16 Sept 20261.11.21.6 MBc019cd1db757…Get
  • 1.10.2-forge-1.3.16 Sept 20261.10.21.6 MB23a599b76f16…Get
  • 1.7.10-forge-1.3.16 Sept 20261.7.101.6 MBc1d859e15f57…Get
  • 1.21.1-neoforge-1.3.0-hotfix525 Jul 20261.21.10.8 MB255 downloads235735e2dc8d…Get
  • 1.7.10-forge-1.3.0-hotfix49 Jul 20261.7.101.5 MB288 downloads9f648a215aa1…Get
  • 1.7.10-forge-1.3.0-hotfix33 Jul 20261.7.101.5 MB70 downloads8c951140898b…Get
  • 1.15.2-forge-1.3.0-hotfix230 Jun 20261.15.22.3 MB27 downloadsf935727f3ed0…Get
  • 1.14.4-forge-1.3.0-hotfix230 Jun 20261.14.42.3 MB22 downloadsad3e176874e9…Get
  • 1.12.2-forge-1.3.0-hotfix230 Jun 20261.12.21.5 MB2.0k downloadsa273d09ac934…Get
  • 1.11.2-forge-1.3.0-hotfix230 Jun 20261.11.21.5 MB14 downloads7cd15d6619b4…Get
  • 1.10.2-forge-1.3.0-hotfix230 Jun 20261.10.21.5 MB21 downloadscc0b83a38d87…Get
  • 1.7.10-forge-1.3.0-hotfix230 Jun 20261.7.101.5 MB61 downloads027151ee3521…Get
  • 1.21.1-neoforge-1.3.0-hotfix129 Jun 20261.21.10.8 MB805 downloadsbaf3d91864ed…Get
  • 1.21.1-neoforge-1.3.027 Jun 20261.21.10.8 MB1.1k downloads936c61c938cc…Get
  • 1.20.1-forge-1.3.027 Jun 20261.20.12.5 MB3.5k downloads5e652517c7ec…Get

Dependencies

What Universal Mod Coredeclares it needs, from the author’s own release metadata. A required one has to be installed alongside it or it will not load.

Frequently asked

Does Universal Mod Core work on Minecraft 1.21.4?

Yes. 1.21.4 is the newest Minecraft version Universal Mod Core declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Universal Mod Core support?

Everything the author has declared, from 1.7.10 up to 1.21.4. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Universal Mod Core on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Universal Mod Core support?

NeoForge, Forge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Universal Mod Core?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What does Universal Mod Core need to run?

It declares MixinBooter, MixinBootstrap and UniMixins as required, so those have to be installed alongside it or it will not load. Each one is linked in the dependencies section above.

What licence is Universal Mod Core under?

LGPL-2.1-only, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Universal Mod Core?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Universal Mod Core safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

Used by

1 project lists Universal Mod Core as a required dependency.

Details from Modrinth, where the author last updated it on 6 Sept 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .