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.
Quick answer
Which OPAC-UI release should I use?
OPAC-UI 1.1.0 (NeoForge 1.21.1) targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 2 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.
The source does not explicitly classify this release as client-only or server-only.
What else does OPAC-UI 1.1.0 (NeoForge 1.21.1) need?
OPAC-UI 1.1.0 (NeoForge 1.21.1). Change the file and its required mods may change too.
Install Open Parties and Claims, Cloth Config API (Fabric/Forge/NeoForge) 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 (NeoForge 1.21.1). Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use OPAC-UI 1.1.0 (NeoForge 1.21.1). 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 (Fabric/Forge/NeoForge) first. We found matching files for this game-version and loader setup.
- 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 OPAC-UI 1.1.0 (NeoForge 1.21.1). 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 CurseForge.
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
OPAC-UI 1.1.0 (NeoForge 1.21.1)
opacui-neoforge-1.21.1-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (Fabric 1.21.1)
opacui-fabric-1.21.1-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (Forge 1.21.1)
opacui-forge-1.21.1-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (Fabric 1.21.11)
opacui-fabric-1.21.11-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (Forge 1.21.11)
opacui-forge-1.21.11-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (NeoForge 1.21.11)
opacui-neoforge-1.21.11-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (NeoForge 26.3)
opacui-neoforge-26.3-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (Forge 26.3)
opacui-forge-26.3-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (Fabric 26.3)
opacui-fabric-26.3-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (NeoForge 26.1.2)
opacui-neoforge-26.1.2-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (Forge 26.1.2)
opacui-forge-26.1.2-1.1.0.jar
29 Oct 2026
OPAC-UI 1.1.0 (Fabric 26.1.2)
opacui-fabric-26.1.2-1.1.0.jar
29 Oct 2026
Looking for an older file? The official CurseForge project page is in Resources.