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OPAC-UIMinecraft mod for 26.3

This project adds a client-side companion for Open Parties and Claims that turns its command-only party management into a full in-game GUI for members, invites, and allies.

client onlynewest supported release 26.3Utility
Latest version
1.1.0
Minecraft
1.20.1 to 26.3
Java
Java 25+
Loaders
NeoForge, Forge, Fabric
Licence
LGPL-3.0-only
Downloads
196.0k
Updated
9 d ago
Available on
Modrinth

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version OPAC-UI declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
26.3NeoForge, Forge, Fabric25+declared15 Sept 2026
26.2Fabric, NeoForge, Forge25+declared16 Jun 2026
26.1.2Fabric, Forge, NeoForge25+declared9 Apr 2026
1.21.11Fabric, NeoForge, Forge21+declared9 Dec 2025
1.21.1NeoForge, Forge, Fabric21+declared8 Aug 2024
1.20.1NeoForge, Fabric, Forge17+declared12 Jun 2023

Download

From OPAC-UI’s own host. Nothing is re-hosted here.

For Minecraft 26.3

Choose the loader you use before downloading.

No matching file appears among the releases shown here. Browse all releases.

Most recently published release

1.1.0release29 Oct 2026

opacui-neoforge-1.21.1-1.1.0.jar · 80 KB · for 1.21.1 · NeoForge

Download this release
de6f854d6bb5…
Older versions7
  • 1.0.629 Oct 202626.1.264 KBa4632e329706…Get
  • 1.0.020 Oct 20261.21.1164 KB7bf1c138fa99…Get
  • 1.0.420 Oct 20261.21.170 KB62d72797e651…Get
  • 1.0.329 Sept 20261.21.170 KBef7ecaa62d79…Get
  • 1.0.529 Sept 202626.1.265 KB9174d9156b3d…Get
  • 1.0.129 Sept 202626.265 KB1ce718c23167…Get
  • 1.0.213 Aug 202626.1.266 KBcef9618bbe72…Get

Dependencies

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

Fabric APIRequired. Lightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.Cloth Config APIRequired. Configuration Library for Minecraft ModsForge Config API PortRequired. NeoForge's & Forge's config systems provided to other modding ecosystems. Designed for a multiloader architecture.Open Parties and ClaimsRequired. Adds the ability to claim chunks and make player parties, integrates with Xaero's Minimap and World Map

Frequently asked

Does OPAC-UI work on Minecraft 26.3?

Yes. 26.3 is the newest Minecraft version OPAC-UI 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 OPAC-UI support?

Everything the author has declared, from 1.20.1 up to 26.3. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install OPAC-UI on the client or the server?

The client only. There is nothing to install on the server side. That is the author's declared design, not a guarantee for every server: one running anti-cheat or missing a counterpart mod can still object.

Which platform or loader does OPAC-UI support?

NeoForge, Forge, Fabric. 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 OPAC-UI?

Among the supported Minecraft releases above, the highest recorded requirement is Java 25 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What does OPAC-UI need to run?

It declares Fabric API, Cloth Config API, Forge Config API Port and Open Parties and Claims 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 OPAC-UI under?

LGPL-3.0-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 OPAC-UI?

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 OPAC-UI 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.

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!BookshelfAn open source library for other mods!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

Details from Modrinth, where the author last updated it on 29 Oct 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? .