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What is open-a?

lorypage/open-a — explained in plain English

Analysis updated 2026-06-24

★ 11JavaAudience · developerComplexity · 3/5LicenseSetup · moderate

In one sentence

Leaked source code of a Minecraft cheat client called ArcaneNG for version 1.21.4, built on the Fabric modding platform. Published for research purposes, some features were intentionally removed before release.

Mindmap

mindmap
  root((open-a / ArcaneNG))
    What it is
      Minecraft cheat client
      Fabric mod
      Leaked source code
    Features
      Automation aids
      Visual enhancements
      Movement exploits
    Tech stack
      Java
      Fabric modding
      Gradle build
    Notes
      GPL v3 license
      Incomplete functions
      Research purposes
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Code map

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filefunction / class

What do people build with it?

USE CASE 1

Study how a Fabric-based Minecraft mod client is structured to learn Java modding techniques.

USE CASE 2

Use the build setup as a reference for compiling a Fabric mod for Minecraft 1.21.4 with Gradle.

USE CASE 3

Analyze the code for educational research into how cheat clients implement automation or visual features in Minecraft.

What is it built with?

JavaFabricGradle

How does it compare?

lorypage/open-aajinkyagokhale/esp-flasher-javatakattowo/bootloaderspoofer
Stars111212
LanguageJavaJavaJava
Setup difficultymoderatemoderatehard
Complexity3/52/55/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 1h+

Some features were intentionally removed before publishing, so parts of the client may need additional fixes to work.

GPL v3, you can use, modify, and share this code freely as long as any software you distribute that includes it is also released under GPL v3.

So what is it?

Open-A is the leaked source code of a Minecraft cheat client called ArcaneNG, targeting version 1.21.4 of the game using the Fabric modding platform. Fabric is a lightweight toolchain that allows developers to create modifications for Minecraft. Cheat clients are unofficial Minecraft clients that add features not present in the official game, typically automation, visual aids, or movement exploits, most of which violate the rules of online servers. The repository's README is written in Chinese and explains that the code was released publicly as a result of a falling-out between the people involved in the client's development. The author received the source code directly from the original developer and chose to publish it. Several functions were intentionally removed before publishing, so parts of the client may not work without additional fixes. The project is licensed under GPL v3. Build instructions are included: clone the repository and run the Gradle build tool. The README is largely a document of grievances against the original developer rather than technical documentation, including chat log screenshots and criticism of code quality. The README includes a disclaimer stating the repository is published for research and learning purposes only, and warns that using cheat clients on servers you do not own violates most server rules.

Copy-paste prompts

Prompt 1
I have the ArcaneNG Minecraft cheat client source code built on Fabric. Walk me through how to compile it with Gradle and load it in Minecraft 1.21.4.
Prompt 2
Show me how Fabric mods hook into Minecraft's rendering pipeline to add visual overlays, like ESP or item highlighting.
Prompt 3
I'm studying this Fabric mod's code structure. Explain how it registers event listeners to intercept player movement or world rendering events.
Prompt 4
What are the common patterns used in Fabric-based Minecraft mods for automating player actions, and where would I find those in this codebase?

Frequently asked questions

What is open-a?

Leaked source code of a Minecraft cheat client called ArcaneNG for version 1.21.4, built on the Fabric modding platform. Published for research purposes, some features were intentionally removed before release.

What language is open-a written in?

Mainly Java. The stack also includes Java, Fabric, Gradle.

What license does open-a use?

GPL v3, you can use, modify, and share this code freely as long as any software you distribute that includes it is also released under GPL v3.

How hard is open-a to set up?

Setup difficulty is rated moderate, with roughly 1h+ to a first successful run.

Who is open-a for?

Mainly developer.

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