A free GitHub tool called REA lets AI assistants look inside any app without its source code. It crossed 93,000 stars in one week and became the world’s most trending repository.
Quick Read
- REA (“Reverse Engineer Anything”) is a free, open-source tool that connects AI coding assistants to reverse-engineering tools.
- It jumped from ~10,000 to 93,000+ GitHub stars in the first week of October 2026, topping GitHub Trending worldwide.
- Useful for students and developers, but it cannot recover original source code — and you must only use it on software you own or are allowed to examine.
What is REA?
REA stands for “Reverse Engineer Anything.” It is a free, open-source tool on GitHub. It connects AI coding assistants like Claude Code, Cursor, and Codex to reverse-engineering tools.
Normally, when you open an app on your phone or computer, you cannot see how it works inside. The source code is hidden. Only the final app file exists. REA changes this. You can ask your AI assistant a simple question in plain English, like “how does this app’s search work?” REA looks inside the app file and gives you the answer with proof.
The tool was built by a developer who goes by “morluto” on GitHub. The code is free for everyone under the MIT license. The official website is rea.tools.
How does REA work?
REA does not come with its own decompiler. Instead, it connects to famous reverse-engineering tools that already exist — Ghidra (free, made by America’s NSA), Hopper, and IDA Pro. It gives your AI agent one simple set of commands to control these tools.
For many common app types, REA can work without any paid tool. It can read Electron desktop apps, Android APK files, .NET programs, website code, and even firmware. You install it with one command on your computer.
One smart design choice: every answer from REA comes with evidence. It tells you how sure it is and what it could not figure out. It does not hide its limits.
Why did REA go viral?
In the first week of October 2026, REA jumped from about 10,000 stars to more than 93,000 stars on GitHub. It became the number one trending repository in the world.
Two posts started the fire. A developer posted about it on X and got 315,000 views. Then tech YouTuber Matthew Berman posted four words — “Reverse Engineer Anything. Software is done.” — and that post crossed 2.8 million views.
People were shocked by the demos. In one demo, an AI agent looked at the Obsidian note-taking app, found how its quick-switcher search ranking works, rebuilt it in 4 minutes, and proved the rebuild was identical across 4,915 tests. In another demo, a 1996 game called DX-Ball was reconstructed so perfectly that all 63 bytes of one game function matched the original.
What can people do with REA?
Students learning cybersecurity can practice reverse engineering on their own programs. Game lovers are using it to preserve old games. Developers study how features work so they can build their own versions. Security researchers use it to examine Android apps in their labs.
For Indian students, this is good news. The main decompiler it uses, Ghidra, is completely free. Anyone with a laptop can start learning reverse engineering at home at zero cost.
What REA cannot do
Let us be honest. REA does not magically give you the original source code. You get a best-guess reconstruction, not the real code the developer wrote. Rebuilding a full feature still needs real engineering skill.
There is also no independent test proving how accurate it is. The impressive demos come from the REA team itself or YouTubers, not from neutral researchers. Sometimes the AI itself refuses to do the task for safety reasons.
And one important safety note: REA is not a safe sandbox. Do not point it at unknown or suspicious files on your main computer. Use a separate virtual machine for anything you do not trust.
Is it legal to use?
REA’s own rules are clear: use it only for lawful work. That means your own software, open-source programs, classroom exercises, and security competitions. Do not use it to copy someone else’s paid app or break their protections. You are responsible for following the law.
Frequently Asked Questions
Is REA free?
Yes. REA itself is free and open-source. Its main partner tool Ghidra is also free. Some optional tools it connects to, like Hopper and IDA Pro, are paid.
Do I need to know reverse engineering to use REA?
No. That is the whole point. You ask questions in plain English and the AI agent drives the complex tools for you. But learning the basics will help you understand the answers better.
Can REA copy any app?
No. It cannot recover original source code, and its own license says you must only analyze software you own or have permission to examine. Copying someone’s paid app is not allowed.
Sources: REA GitHub repository (github.com/morluto/rea), rea.tools official site, agentbreaking.com analysis (Oct 12, 2026).
