Reverse Engineer Anything (REA) + Claude Code Tutorial [Full Build]

Every prompt I used is in my free newsletter: https://rakhulkarthick.substack.com/p... REA (Reverse Engineer Anything) lets Claude Code look inside an app before it builds anything. In this tutorial I use it to clone 3 things I already pay for or use: Recut (a $15/month Mac app), Calendly's booking page, and a promo video. REA is a free, open-source GitHub tool with 300,000+ stars. It plugs into Claude Code or Codex through MCP and picks the right tool for the app: a decompiler like Hopper, Ghidra or IDA for desktop apps, Chrome for websites, and a web-code reader for apps built from web code. It never builds anything itself. It hands your AI an evidence file, then your AI builds your own version. What's in it: How REA works, in one diagram Setting up REA in Claude Code with one prompt REA reading Recut from the inside, with an evidence file and a list of unknowns Gapless: my own Mac app rebuilt from that evidence, side by side with Recut Openhour: my own booking page rebuilt from Calendly, live on Vercel A 30-second promo for Gapless, rebuilt from an ElevenLabs promo Chapters: 00:00 Clone the apps you already use, with REA 01:54 How REA works 03:25 Set up REA 05:47 Pick an app 07:22 REA reads Recut 09:43 Build Gapless 11:14 How it worked 13:15 Clone Calendly 18:15 Clone a promo 23:18 Wrap up Links: REA on GitHub: https://github.com/morluto/rea REA site: https://rea.tools Recut: https://getrecut.com Calendly: https://calendly.com Vercel MCP: https://vercel.com/docs/ai-tooling/ve... If you want to build things like this with me, subscribe. I post a new build every week. Rakhul