OpenUI MC is a client-side UI framework used by Minecraft mod developers to build polished, reactive screens without rewriting focus, input routing, layout, animation, and widget lifecycle plumbing.
OpenUI MC is a library mod. It does not add blocks, items, recipes, or gameplay by itself. Install it when another mod lists OpenUI MC as a required dependency, and make sure the Minecraft version and loader match that mod.
OpenUI MC keeps application code focused on state and business callbacks while its runtime mounts components, computes layout, renders, dispatches input, owns focus, and cleans up resources.
| Minecraft | Loader | Required Java |
|---|---|---|
| 1.20.1 | Fabric | 17 |
| 1.20.1 | Forge | 17 |
| 1.21.1 | Fabric | 21 |
| 1.21.1 | NeoForge | 21 |
| 26.1.2 | NeoForge | 25 |
Download the file matching both your Minecraft version and loader. Builds are client-side and are not interchangeable between Minecraft generations.
Minecraft 26.1.2 uses its extracted GUI render-state API. OpenUI supports that API, but FadeTransition is unavailable because Minecraft no longer exposes a safe scoped opacity operation for arbitrary UI subtrees. Slide and scale transitions remain available.
Report bugs and compatibility problems on the GitHub issue tracker. Include the Minecraft version, loader, OpenUI version, and the consuming mod.
OpenUI MC is authored by NsTut and distributed under the MIT License.
