
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 matches Fabric?
OPAC-UI 1.2.0 targets 1.21.1 with Fabric. It must be installed on the client. Do not install it on the dedicated server. All 4 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 1.2.0 need?
1.2.0 on Fabric. Every mod below is checked against that same setup.
Install Fabric API, Open Parties and Claims, Cloth Config API, Forge Config API Port first. We found matching files for this game-version and loader setup. 2 come through another mod in the chain.
2 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 1.2.0 on Fabric. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.2.0. It targets 1.21.1 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Fabric API, Open Parties and Claims, Cloth Config API, Forge Config API Port first. We found matching files for this game-version and loader setup. 2 come through another mod in the chain.
- 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 1.2.0. 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
1.2.0
opacui-fabric-1.21.1-1.2.0.jar
12 Nov 2026
1.2.0
opacui-fabric-1.21.11-1.2.0.jar
12 Nov 2026
1.2.0
opacui-fabric-26.2-1.2.0.jar
12 Nov 2026
1.2.0
opacui-fabric-1.20.1-1.2.0.jar
12 Nov 2026
1.2.0
opacui-fabric-26.1.2-1.2.0.jar
12 Nov 2026
1.1.0
opacui-fabric-1.21.1-1.1.0.jar
29 Oct 2026
1.1.0
opacui-fabric-1.21.11-1.1.0.jar
29 Oct 2026
1.1.0
opacui-fabric-26.3-1.1.0.jar
29 Oct 2026
1.1.0
opacui-fabric-26.1.2-1.1.0.jar
29 Oct 2026
1.1.0
opacui-fabric-1.20.1-1.1.0.jar
29 Oct 2026
1.1.0
opacui-fabric-26.2-1.1.0.jar
29 Oct 2026
1.0.5
opacui-fabric-1.21.1-1.0.5.jar
29 Oct 2026
Looking for an older file? The official Modrinth project page is in Resources.