# REA reverse-engineers any app. I built REAShield to make it come back empty > Source: > Published: 2026-11-01 13:50:11+00:00 Right now the #1 trending repo on GitHub is [REA](https://github.com/morluto/rea) — *Reverse Engineer Anything*. 335K+ stars. It lets anyone point an AI agent at your shipped app and rebuild any feature. No source code. One command. It's already a one-prompt skill inside mainstream AI tools. The whole internet's reaction has been some version of: *"software is dead," "your app is exposed," "every competitor can clone you now."* They're right. And in a week of 100K+ developers rushing to use REA to open other people's apps, I noticed something: **nobody built the defense.** So I did. It's called **REAShield** — the direct counter to REA. The name says the whole thing: REA opens apps, REAShield closes yours. No hand-waving. REAShield ships a harness that runs **the actual REA** against your own app, before and after hardening, and scores what it recovers. On my test app: Because the secrets weren't obfuscated. They were **gone**: moved off-device, sealed as ciphertext, or compiled into WebAssembly REA can't walk. REA is **static** — it never runs your app, and it leaves anything runtime-computed "unresolved." REAShield weaponizes exactly that: ``` npm i -D reashield npx reashield build npx reashield test --rea ``` Run REA on your app before and after. Watch the recovery number drop to zero. (JS, Electron, and Python: `pip install reashield`.) Offline code is never *unbreakable*. If a machine runs it, it has it; a determined human still gets there. REAShield's job is to defeat the **automated** attack — the one REA just handed to everyone — and raise a human's cost from minutes to days. REA made reverse-engineering a one-command skill. REAShield makes the defense one too. **[https://github.com/HMAKT99/reashield](https://github.com/HMAKT99/reashield)** — point REA at it and try to break it.