
Modrinth · 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.
Quick answer
Which OPAC-UI release should I use?
OPAC-UI 1.1.0 targets 1.21.1 with NeoForge. It must be installed on the client. Do not install it on the dedicated server. All 2 required mods have matching files.
Where it goes
Is OPAC-UI required on the client, server, or both?
It must be installed on the client. Do not install it on the dedicated server.
This file is marked client-only.
What else does OPAC-UI 1.1.0 need?
1.1.0. Change the file and its required mods may change too.
Install Open Parties and Claims, Cloth Config API first. We found matching files for this game-version and loader setup.
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 1.1.0. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.1.0. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Open Parties and Claims, Cloth Config API first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
It must be installed on the client. Do not install it on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.1.0. 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 using Cloth Config's tabbed-list UI.
Requirements
- Minecraft 1.20.1 (Fabric)
- Fabric API
- Forge Config API Port (Fabric only - required by Open Parties and Claims' Fabric build)
- Open Parties and Claims (≥ 1.20.1)
- Cloth Config API (≥ 11.x)
Usage
Press P (configurable in key bindings) to open the party manager.
- Not in a party - Create Party button
- In a party - Tabbed screen with three tabs:
- Members - view ranked member list; promote/demote, kick, and transfer ownership (permission-dependent)
- Invite - invite players by name; revoke pending invites
- Allies - view allied parties; unally (permission-dependent)
Branches
This mod is maintained as one branch per Minecraft version - see each
branch's own README and CHANGELOG on GitHub
for loader-specific setup notes.
opac-ui always requires Open Parties and Claims
- it's a client-side add-on, not a standalone mod. Exact versions per branch:
| Branch | Minecraft | Loader(s) | Open Parties and Claims | Cloth Config API | Fabric API | Forge Config API Port |
|---|---|---|---|---|---|---|
1.20.1/main |
1.20.1 | Fabric | ≥ 1.20.1 | ≥ 11.x | 0.92.11+1.20.1 | Fabric only |
1.21.1/main |
1.21.1 | Fabric, Forge, NeoForge | ≥ 1.21.1 | ≥ 15.x | 0.105.0+1.21.1 (Fabric) | Fabric and Forge (not needed on NeoForge) |
1.21.11/main |
1.21.11 | Fabric, Forge, NeoForge | ≥ 1.21.11 | not used | 0.139.5+1.21.11 (Fabric) | Fabric and Forge (not needed on NeoForge) |
26.1.2/main |
26.1.2 | Fabric, Forge, NeoForge | ≥ 26.1.2 | not used | 0.145.4+26.1.2 (Fabric) | Fabric and Forge (not needed on NeoForge) |
26.2/main |
26.2 | Fabric, Forge, NeoForge | ≥ 26.2 | not used | 0.159.0+26.2 (Fabric) | Fabric and Forge (not needed on NeoForge) |
26.3/main |
26.3 | Fabric, Forge, NeoForge | ≥ 26.3 | not used | 0.162.0+26.3 (Fabric) | Fabric and Forge (not needed on NeoForge) |
Notes:
- Cloth Config was dropped starting with the
26.1.2/mainbranch (and on1.21.11/main, which is built from it) since it
no longer ships a Forge build - the party screen there is built entirely
with Minecraft's own UI components instead. 26.1.2/main,26.2/mainand26.3/mainalso need Java 25 (bundled with the game;
only relevant when building from source).
License
LGPL-3.0-only - see LICENSE. Matches the Open Parties and Claims project.
Project description from Modrinth.
Pick your setup
OPAC-UI by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.3
3 loader builds26.2
3 loader builds26.1.2
3 loader builds1.21.11
3 loader builds1.21.1
3 loader builds1.20.1
2 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
OPAC-UI versions and loaders
1.1.0
opacui-neoforge-1.21.1-1.1.0.jar
29 Oct 2026
1.1.0
opacui-forge-1.21.1-1.1.0.jar
29 Oct 2026
1.1.0
opacui-fabric-1.21.1-1.1.0.jar
29 Oct 2026
1.1.0
opacui-neoforge-1.21.11-1.1.0.jar
29 Oct 2026
1.1.0
opacui-fabric-1.21.11-1.1.0.jar
29 Oct 2026
1.1.0
opacui-forge-1.21.11-1.1.0.jar
29 Oct 2026
1.1.0
opacui-fabric-26.3-1.1.0.jar
29 Oct 2026
1.1.0
opacui-forge-26.3-1.1.0.jar
29 Oct 2026
1.1.0
opacui-neoforge-26.3-1.1.0.jar
29 Oct 2026
1.1.0
opacui-neoforge-26.1.2-1.1.0.jar
29 Oct 2026
1.1.0
opacui-forge-26.1.2-1.1.0.jar
29 Oct 2026
1.1.0
opacui-fabric-26.1.2-1.1.0.jar
29 Oct 2026
Looking for an older file? The official Modrinth project page is in Resources.