CurseForge · Minecraft mod

OPAC-UI

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.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which OPAC-UI release matches Fabric?

Updated 21 days ago

Best match for your filters opacui-fabric-26.1.2-1.0.2.jar

Game version 26.1.2

Loader Fabric

OPAC-UI opacui-fabric-26.1.2-1.0.2.jar targets 26.1.2 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. All 3 required mods have matching files.

Where it goes

Is OPAC-UI required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say

Dedicated server Source doesn’t say

Loader for this release Fabric

Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does OPAC-UI opacui-fabric-26.1.2-1.0.2.jar need?

opacui-fabric-26.1.2-1.0.2.jar on Fabric. Every mod below is checked against that same setup.

All 3 required mods have matching files

Install Open Parties and Claims, Forge Config API Port, Fabric API first. We found matching files for this game-version and loader setup. 4 come through another mod in the chain.

1 listed on this file 4 pulled in by those mods

Open Parties and Claims Needed by OPAC-UI opacui-fabric-26.1.2-1.0.2.jar

required

Matching file found Matched file: open-parties-and-claims-fabric-26.1.2-0.30.3.jar

Forge Config API Port Needed by Open Parties and Claims

pulled in

Matching file found Matched file: [FABRIC] [26.1.x] v26.1.5

Fabric API Needed by Open Parties and Claims

pulled in

Matching file found Matched file: [26.1.2] Fabric API 0.155.2+26.1.2

Mod Menu Needed by Forge Config API Port

pulled in

Matching file found Matched file: v18.0.0 for 26.1

Text Placeholder API Needed by Mod Menu

pulled in

Matching file found Matched file: placeholder-api-3.0.0+26.1.jar

4 extra mods were pulled in by other dependencies. 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 OPAC-UI without breaking your instance.

Built for OPAC-UI opacui-fabric-26.1.2-1.0.2.jar on Fabric. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use opacui-fabric-26.1.2-1.0.2.jar. It targets 26.1.2 with Fabric; another release may have different loader, side or dependency requirements.
02
Bring the mods it needs

Install Open Parties and Claims, Forge Config API Port, Fabric API first. We found matching files for this game-version and loader setup. 4 come 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 opacui-fabric-26.1.2-1.0.2.jar. It opens that exact file at the source.

About this project

What does OPAC-UI add?

opac-ui

A client-side mod that adds an in-game party management GUI for Open Parties and Claims. Press P in-game to open the party manager: create or join a party, manage members (promote, demote, kick, transfer ownership), send and revoke invites, and manage allied parties, all from one screen instead of chat commands.

Branches

This project is maintained across multiple Minecraft versions as separate branches, since each version needs its own dependency versions and sometimes its own UI approach entirely.

Branch	Minecraft	Loaders	UI built on	Status
`1.20.1/main`	1.20.1	Fabric	Cloth Config	Stable
`1.21.1/main`	1.21.1	Fabric, Forge, NeoForge	Cloth Config	Known issue: black background when Menu Background Blurriness is enabled (workaround: turn it off)
`26.1.2/main`	26.1.2	Fabric, Forge, NeoForge	Vanilla widgets (no Cloth Config)	Released (Stable)

Cloth Config was dropped starting with the 26.1.2 branch since it no longer ships a Forge build at all past a certain version, so the party screen there is built entirely with Minecraft's own UI components instead.

Check the README and CHANGELOG on each branch on Github for exact requirements and version-specific notes.

License

LGPL-3.0-only, matching Open Parties and Claims. See the LICENSE file on any branch.

Project description from CurseForge.

Pick your setup

OPAC-UI by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

8 available setups

Minecraft version

26.1.2

3 loader builds

Forge opacui-forge-26.1.2-1.0.2.jar 3 stable files · 3 total · 13 Aug 2026 Fabric opacui-fabric-26.1.2-1.0.2.jar 3 stable files · 3 total · 13 Aug 2026 NeoForge opacui-neoforge-26.1.2-1.0.2.jar 3 stable files · 3 total · 13 Aug 2026

Minecraft version

1.21.1

3 loader builds

Forge opacui-forge-1.21.1-1.0.1.jar 2 stable files · 2 total · 13 Aug 2026 Fabric opacui-fabric-1.21.1-1.0.1.jar 2 stable files · 2 total · 13 Aug 2026 NeoForge opacui-neoforge-1.21.1-1.0.0.jar 1 stable file · 1 total · 5 Aug 2026

Minecraft version

1.20.1

2 loader builds

Forge opacui-forge-1.20.1-1.0.2.jar 3 stable files · 3 total · 13 Aug 2026 Fabric opacui-fabric-1.20.1-1.0.2.jar 3 stable files · 3 total · 13 Aug 2026

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

OPAC-UI versions and loaders

8 of 20 releases match

opacui-fabric-26.1.2-1.0.2.jar

13 Aug 2026

Client Source doesn’t say Server Source doesn’t say Dependencies 3 required · matched Listed on Release listing

Check the 26.1.2 · Fabric setup

Fabric26.1.2 release

Download on CurseForge