Nucleus-Editor
Nucleus-Editor is a library for Fabric, NeoForge and Quilt that gives client-side mods a lightweight ImGui implementation to draw interfaces with.
What it does
Nucleus-Editor is a Java library that wraps Dear ImGui for Minecraft. Mods subscribe to a render callback provided by the library and draw their own windows and tools through it. It is installed on the client only, so servers run without it. Builds exist for Fabric, NeoForge and Quilt across 1.21 – 1.21.5, with 1.0.0 as the latest file for each loader, and the project is open source under the MIT License.
Key features
Lightweight ImGui
The library provides a compact Dear ImGui implementation written in Java, so mods do not need to bundle their own copy.
Render callback
Mods subscribe to a render callback that the library calls each frame, where they place ImGui windows and widgets.
Client-side design
Only the client loads the library, and nothing needs to be installed on the server.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
ImGuiMC is client-side only, open source under the GNU Lesser General Public License v3.0 only, and published for Fabric and NeoForge across 1.21 – 26.2. imgui-mc is also client-side only and open source under the MIT License, but it targets Fabric alone for 1.20.4 – 1.21.4.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Nucleus-Editor | Fabric, NeoForge and Quilt | 1.21 – 1.21.5 | Client-side only | 2025-04-01 |
| ImGuiMC | Fabric and NeoForge | 1.21 – 26.2 | Client-side only | 2026-08-10 |
| imgui-mc | Fabric | 1.20.4 – 1.21.4 | Client-side only | 2026-02-16 |
Questions
Does Nucleus-Editor need to be installed on the server?
Which loaders does Nucleus-Editor support?
In the catalog
Nucleus-Editor is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 15,307 mods support Minecraft 1.21.5.
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What the author says
This is a lightweigt implementation of dear imguis java libs, also containing a render callback for mods to subscribe to. can be used via jarjaring it is fully allowed if desired, altough a fair warning, at this point in time there seem to be some conflict with other imgui shipping mods like veil. we are looking into…
Official listing
- Modrinth page
- modrinth.com/mod/nucleus-editor
- Owner
- Truly Modular
- Published
- 2025-04-01
- Updated on Modrinth
- 2025-04-01
- Facts verified
- 2026-10-15