Reverse Engineer Anything (REA): 5 Places to Point Your AI

Podcast/Substack · ~23 min · Listen · (gathered 2026-10-18)

• Nate B. Jones introduces “Reverse Engineer Anything (REA),” an open-source tool that enables AI coding assistants (like Codex and Claude Code) to investigate existing software, even without its source code, to understand its underlying logic and build more robust applications.
• REA addresses the common problem of AI-generated apps that appear functional but lack deep operational understanding, by allowing the AI to inspect code and behavior to reveal critical decisions (e.g., data storage, calculation methods). The “Ledger Reborn” project, which reverse-engineered QuickBooks Desktop to create a new accounting application, is highlighted as a successful application of REA.
• The article provides five specific starting points for using REA, including asking focused questions, confirming tool installation, converting a business rule into a specification (using the QuickBooks example), analyzing clipboard functionality (like Notion’s), and applying REA to personal or legacy applications, each with a suggested prompt and validation method.