OptiGUI

OptiGUI

OptiGUI is a client-side mod, which enables the customization of in-game GUI screen textures with resource packs. Now rewritten from scratch in Kotlin for cleaner code, better performance, more features, and extensibility.
Other mods' developers can add their custom containers and customization options. See documentation link above.

Supports most OptiFine GUI resource packs. If a resource pack does not work or works differently than using OptiFine, please open an issue (select the Report a bug template).

Check out my new OptiGUI resource pack for Minecraft 1.19+: Chest Boat GUI

⚠️ OptiGUI 2.3.x prior to beta 8 is incompatible with Fabric Language Kotlin 1.13.5+. Please downgrade to Fabric Language Kotlin 1.13.4.

How to use it

⚠️ If you're not a resource pack creator experimenting with OptiGUI 3 JSON resources, then you should stick with OptiGUI 2.3.x betas.

1. Download and install Fabric loader or Quilt loader
2. Download this mod to your mods folder
3. Download the required dependencies to your mods folder as well
4. Download and enable a supported resource pack (see below)

Supported languages

🇺🇸 by opekope2
🇹🇼 by dirtTW, notlin4
🇨🇳 by dirtTW, notlin4
🇩🇪 by Lucanoria
🇪🇸 by LyriaWintona
🇮🇹 by RoberbufDx8105
🇲🇾 by NuruddinPlays
🇺🇦 by gorr0w7

Want to see your name here? Translate OptiGUI to your native language.

Compatibility

Cobblemon

If you play with Cobblemon 1.5.2 and earlier, you need Fabric Language Kotlin 1.10.11+kotlin.1.9.20 or earlier (which doesn't crash).

Supported loaders & clients

As of the latest OptiGUI 3 alpha release, only Fabric & Quilt loaders are supported.

⚠️ Quilt support is based on Quilt loader's support for loading Fabric mods.

⚠️ Support for using Fabric compatibility layers or alternative clients such as Sinytra Connector or Lunar client is done on a best-effort basis, but issues may arise, which is not necessarily OptiGUI's fault.

Resource pack docs

OptiGUI supports OptiFine custom GUI resource packs, and also supports OptiGUI resource packs. OptiGUI resource packs are more flexible than OptiFine resource packs.
See documentation link above to get started.

Supported resource packs (OptiGUI 2.3.x)

Excluding vanilla resource packs (which don't container OptiFine or OptiGUI-specific files)

Colourful Containers
Colourful Containers Add-On
Colourful Containers Dark Mode
Animated RGB GUI ¹
NEON20 ANIMATED
Rybo's Enhanced GUI
Animated Fox Guis ¹
[\[DARK\] Animated Fox Guis](https://www.planetminecraft.com/texture-pack/fox-4931933/) ¹
Recolourful Containers GUI + HUD

¹ see FAQ for animation support

This list is not exhaustive. If you know a resource pack which works, and you'd like to see it here, or a resource pack, which does not work, but works with OptiFine, please open an issue.

Partially supported resource packs

Excluding vanilla resource packs (which don't container OptiFine or OptiGUI-specific files)

New Default+ ¹

¹ Barrel does not work, neither does it work with OptiFine. The resource pack does not specify it according to the format.

FAQ

Use in a modpack?

Yes.

OptiFine GUI animations?

Only with Animatica.

OptiFine colors (colors.properties)?

No, use Colormatic.

Performance impact?

OptiGUI's performance impact is negligible (tho it varies a bit depending on which resource packs are used).

Configuration GUI/file?

Nothing to configure.

Sodium?

Yes.

OptiFine?

Actually, OptiGUI and OptiFine (with OptiFabric) can be loaded simultaneously.
I have observed that OptiGUI mixins will be placed before OptiFine ones, so you can turn off custom GUIs in OptiFine to save performance.

However, I can't assist you with this.

ABOUT THIS LISTING

This page describes OptiGUI by opekope2. The description and screenshots are the author's own, imported from their listing on Modrinth on 3 October 2026: https://modrinth.com/mod/optigui

Mythiq.net hosts no files for it. The download button goes straight to the release file on cdn.modrinth.com, so you are downloading from the author's own host, not from a copy of ours.

The download count, rating and comments on this page start at zero and count Mythiq.net only. The source's own figures are not copied here — they measure a different site, and a number that cannot be checked against our own ledger is not worth printing.

MOD LOADER

This release is built for Fabric and Quilt. A mod built for one loader will not load under another — Fabric mods do not run on Forge, and vice versa.

GAME VERSION

Built for Minecraft 26.3. Minecraft mods are tied to an exact version: a 1.21.4 build will refuse to load on 1.21.5.

DEPENDENCIES

Check the author's listing for required libraries before you start the game — a missing dependency shows up as a crash on launch, not as a warning.

1. Install Fabric for the Minecraft version you play, if you have not already.

2. Download the .jar with the button on this page. Do not unzip it — a mod jar is installed as it is.

3. Put it in your mods folder:

Windows — %APPDATA%\.minecraft\mods

macOS — ~/Library/Application Support/minecraft/mods

Linux — ~/.minecraft/mods

4. Launch the game with the Fabric profile selected.

ON A SERVER

Anything that changes world generation or gameplay has to be installed on the server as well as on every client. Client-side visual and interface mods do not.

UPDATING

Replace the old .jar rather than adding the new one beside it. Two versions of the same mod in the folder is a crash on launch.