KotlinMCUI

A GUI lib powered by Kotlin DSL. It's designed to support all minecraft versions and loaders(seperate backend required)

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fabricforgeneoforge

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About this Mod

A GUI lib powered by kotlin DSL. It's designed to support all minecraft versions and loaders.

docs:docs

Good binary compatibility

In a single jar.
Independent from minecraft and loader.
Has a cross-platform entrypoint.
Compatibility is guaranteed by the backend.

Supported features:

declarative, responsive layout
simple syntax
vanilla ui style
contexed scaling
keyboard operation
narrator
tooltip
focus, hover
local variables
interpolated animation
text translation
components:
- Row、Column、Box
- Button
- Slider
- Container、Slot、Item
- EditableText
- Row
- Column
- LazyColumn
- Text
  - TextAutoFold
  - EditableText
  - font size, color
  - italic, bold, shadowed, underlined…
- Image
  - local file images
  - resource images
  - nineslice render
- …

Available Versions

KotlinMCUI 1.0.0-alpha.30alpha

MC 1.14, 1.14.1, 1.14.2, 1.14.3, 1.14.4, 1.15, 1.15.1, 1.15.2, 1.16, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.17, 1.17.1, 1.18, 1.18.1, 1.18.2, 1.19, 1.19.1, 1.19.2, 1.19.3, 1.19.4, 1.20, 1.20.1, 1.20.2, 1.20.3, 1.20.4, 1.20.5, 1.20.6, 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11fabric, forge, neoforge

March 22, 2026

KotlinMCUI 1.0.0-alpha.29alpha

March 15, 2026

KotlinMCUI 1.0.0-alpha.28alpha

March 14, 2026

KotlinMCUI 1.0.0-alpha.27alpha

March 7, 2026

KotlinMCUI 1.0.0-alpha.26alpha

March 7, 2026

How to Install KotlinMCUI on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

Install Mod

Open the mod browser in the dashboard and search for "KotlinMCUI". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabricforgeneoforge

Minecraft Versions

1.21.11, 1.21.10, 1.21.9 (+40 more)

Server-side

✗ Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

KotlinMCUI server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.

Is KotlinMCUI compatible with fabric and forge and neoforge?

KotlinMCUI officially supports fabric, forge, neoforge for Minecraft 1.21.11, 1.21.10, 1.21.9. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with KotlinMCUI – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if KotlinMCUI consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.