What does this pack do?

Butterium is a client-like modpack that makes your game as smooth as possible by (in some cases) QUADRUPLING your FPS allowing for smooth gameplay on even the lowest of hardware. In some cases this pack even performs better than both Lunar and Feather

Butterium also integrates each mod into it's very own custom-made ButterUI so you shouldn't ever see an ugly config file or bloated menu with thousands of options ever again

To put it simply, we achieve UX perfection with performance, quality of life and gameplay all in one pack with less than 36 mods.

Please view the gallery to see more UI, HUD and features

^ Mid-resolution gif of ButterUI customizations minimized to a small window

Features

⚡ Lightning fast performance - Butterium has comparable performance to the top performance packs on this platform without being a bloated RAM hog, in some cases we out-perform these packs (especially in multiplayer)

🎮 Cool gameplay/multiplayer features - We have features like freecam, fullbright, version-switching, account switching, resource/shader pack browsing, voice chat and more to ensure that you have more than high FPS

⚙️ Custom settings and GUI's - We use FancyMenu to fine tune our GUIs and integrate mods using our own ButterUI design language, integrated mods feature redesigned config screens accessible from Butterium menus and settings

🎮 Custom HUD - We integrate features like keystrokes, time, armor display, co-ordinates and more into Butteriums HUD, you can drag everything around with ease

📆 Regular updates - BUTR Studios is dedicated to bug-squashing and meeting user needs by adding new features and improving UX constantly

What is ButterUI?

ButterUI is an OreUI-inspired design language featuring user friendly, abstract looking menus and insane customisation - you can simply change the accent color and background from a nice personalisation settings menu

↳ Or you could even enter FancyMenu (please read the documentation) and customise EVERYTHING- Not easy but still super cool for advanced users

We provide ButterUI support for a whole bunch of mods- all included mods should be supported and a range of popular mods you can add yourself are supported to be consistent with ButterUI design. A list will be released soon on GitHub

ButterUI is made with our own resource packs and FancyMenu configuration. I (caela.uk) work with FancyMenu a lot and have been for approximately 2 years now. I commonly push FancyMenu's limits and have to request tons of features, most of which Keksuccino kindly adds for me (and others) to make ButterUI better with

Why is this modpack to be compared to a client?

As you can see, we refer to Butterium as a Client-like modpack. Lets explain why:

1. Many of our users have switched from using popular clients to using Butterium

2. Us devs make this pack feel as custom made for you as possible (e.g draggable windows, onboarding)

3. We're working to make this pack integrate each mod to perfection, from custom menus, keybinds and commands, to completely custom mods themselves (coming soon)

4. We are actively working on a client-like yet minimal launcher with the ability download and install the modpack from Modrinth automatically for those users who might be new to modpacks or transitioning from a popular client

Roadmap/to-do list

• Add a "support us" widget

• ButterHost integration and features

↳ Like controlling the server and starting a free trial from in game (referral systems too), hook in with the social features

• Installer, launcher and minimal mobile app

↳ https://github.com/BUTR-Studios/BUTR-Launcher

• Launcher Crash Assistant

↳ With Discord link and "copy logs" button

• Redesign HUD editor w/ support for resizable HUD widgets

↳ With sliders and submenus

• Optional translucent HUD widget backgrounds

• Set up Discord Status to include download button

• For cool events servers, show live events on a main menu widget

• Move assets to resources

↳ Also allow resource pack to edit configs and stuff with txts like overrides (prompt first)

Rework all icons as pixel-perfect images (maybe with seperate folder for included shadows)

Move all text to localization keys

• Spec detection and optimization

↳ https://github.com/BUTR-Studios/spec-engine

Hardware scoring system, then finds optimal configs and modset for your specs

• Screenshot previews and viewer

• Elimination counter

↳ Maybe similar to Fortnite- skull icon?

credit: fishandchips

• Custom HUD item counters

↳ e.g. gapples, arrows, potions

credit: fishandchips

• Armor and tool durability notifications

↳ credit: fishandchips

• Ports to 1.21.1 and 1.20.1 Fabric, maybe NeoForge one day

• Allow compatible mods to be installed and toggled from in-game

↳ "You have unsaved changes" text for when the user needs to restart their game

Remove mods with .bat/.sh

Inspired by Lunar and Feather mods screens- showing just icons, clicking them opens the description and/or config (maybe a description screen with a button for config)

• Update and enable friends sidebar

↳ With world/server invites, friends sidebar and social features are currently half-finished

• Click FX at the cursor

↳ Cool, customizable effect that follows accent colour

• Donate, help and Discord buttons somewhere in options

• Fix variable names and values + simplify and optimize all layouts and element anchors

↳ This will help users better understand Butterium and edit the FM configuration

• Known mod incompatibility warning from GitHub (ver).txt

↳ Compare loaded mods to a GitHub list of incompatible mods - also print to logs

Possibly also "compatibility mode"

• Custom inventory shortcuts

↳ Should be styled like the inventory and also adapt to resource packs, maybe contact some RP creators to add support

• Remove some layouts for settings menus

↳ Would improve mod compatability with mods that change settings

• Send specs to API on command using MC username for help support

↳ Optionally also logs but we must ask for the users explicit permission and warn them of what logs store before doing anything

• Advanced customisation button in personalisation and Credits menus that leads to new menu

↳ This menu should teach users how to create and download resource packs for Butterium

• Custom backgrounds replacing "0" in the BG carousel (.png, .jpg, .jpeg)

• Light and Midnight UI themes

↳ credit: fishandchips

• Use the accent colour in more places and improve UI design

• Tools for resource pack creators

↳ W/ FMv3.8 - imagine making a resource pack just by walking around your world and clicking blocks to change their texture by selecting a png from your system. This will update the pack you're working on in real time but won't replace messing with files

• Toggleable health indicators

↳ Could be done with a resource pack or mod credit: fishandchips

Credits/Legal

Most, if not all of our GUI's were created using the amazing tool that is FancyMenu by Keksuccino, this is amazing for creators as it allows for custom designs and scripting within Minecraft, faster and better than any custom mod we could ever create ourselves.

Butterium has been a passion project of many names over the past 2 years and we wouldn't be here if not for our amazing community and supporters from the Minecraft modding scene

We protect our work with the Smooth Like BUTR Licence (SLBLv1)

Licence details

Smooth Like BUTR Licence (SLBLv1)

Copyright © 2026 BUTR Corporation

1. Creative Works, Assets & Design

All custom assets and creative works, including but not limited to:

• Custom Images, Logos, Resource Packs and Branding

• Any code or scripts we create (Python, Bash, Batch, etc. )

• FancyMenu Layouts (.txt files from [MODPACK]/fancymenu/customization/ and anything in the [MODPACK]/fancymenu/assets/ folder)

Are strictly proprietary. You may NOT redistribute or incorporate these into other software/modpacks without explicit written permission from the following email: legal@butr.uk

2. Configurations

Permission is hereby granted free of charge to any person obtaining a copy of the configuration files (mainly located in folders like [MODPACK]/config/) to:

• Modify and adapt the settings for personal or server use

• Share specific or few configurations and tweaks with the community and others

Note: This strictly does NOT include the right to redistribute the entire config folder as a standalone "copycat" pack since that would also contain our creative works like assets and FancyMenu layouts.

3. General Terms

Our works (such as Modpacks or services) as a whole are provided "AS IS". This licence does not cover the individual mods contained within packs, which are subject to their own respective creators' licenses.

In no event shall BUTR Corporation be held liable for any claims or damages that may occur whilst you are using our software (including modpacks) or services. We do not care whether your PC grew legs and walked away or if it just crashed to desktop, we won't be paying. Our staff and community will try to provide help and support but we are not required to.

Jurisdiction: This licence is governed by the laws of England and Wales. Any disputes shall be handled exclusively in the courts of England and Wales too.

4. A quick message from BUTR 💛

We are not Nintendo; we don't want to chase you down for copying the most simple of snippets or modifying assets to create a nice add-on for our packs (we LOVE that)

But- (and this is a very big but 🥁) if we do find you using our own copyrighted work in a way that poses a threat to us, we reserve the legal right to drop a very kind Cease and Desist letter through your mailbox.

Honestly from vro to vro and to keep you safe, I would always recommend asking legal@butr.uk and crediting us before you copy anything that could be considered our "creative works".

Where do I report bugs/request features?

If you encounter any incompatibilities, missing features or bugs whilst using this modpack please report them to the BUTR Studios official Discord linked below ↓