SMRTR ProgrammingDec 28, 2025Daily.dev

Building a Complete FIRE Calculator App with GitHub Copilot in One Chat Session

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A developer used GitHub Copilot's agent mode in VS Code to build a complete FIRE calculator app in just 30 minutes through a single chat session. The privacy-focused Progressive Web App features nine calculators including Standard FIRE, Coast FIRE, Lean FIRE, and Fat FIRE, with all calculations performed client-side. Copilot handled everything from project scaffolding with React, TypeScript, and Tailwind CSS to implementing bug fixes and adding features like offline support and URL-based sharing.

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