---
title: "Building a Complete FIRE Calculator App with GitHub Copilot in One Chat Session"
url: https://daily.dev/posts/building-a-complete-fire-calculator-app-with-github-copilot-in-one-chat-session-cinztaiec
source_url: https://montemagno.com/building-a-complete-fire-calculator-app-with-github-copilot-in-one-chat-session/
type: article
source: "James Montemagno"
published: 2025-12-24T16:14:13.517Z
updated: 2025-12-24T16:14:34.569Z
tags: ["react", "github", "typescript", "vscode", "pwa"]
reading_time: 6
upvotes: 133
comments: 8
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
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# Building a Complete FIRE Calculator App with GitHub Copilot in One Chat Session

**[James Montemagno](https://daily.dev/sources/montemagno)** · 6 min read · 133 upvotes · 8 comments

## Summary

A developer built a complete FIRE (Financial Independence, Retire Early) calculator app in 30 minutes using GitHub Copilot's agent mode in VS Code. The privacy-first PWA includes 9 different calculators (Standard FIRE, Coast FIRE, Lean/Fat FIRE, Barista FIRE, and more), works completely offline, stores no data, and was created through a single conversational chat session. The app uses React, TypeScript, Tailwind CSS, and Recharts, with all calculations happening client-side and shareable via URL parameters.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://montemagno.com/building-a-complete-fire-calculator-app-with-github-copilot-in-one-chat-session/>

## Community discussion

Top comments from developers on daily.dev.

**@yaireo** · 8 upvotes

> I've built one few years ago - https://www.future-fortune.com/

**@shahbaz7** · 4 upvotes

> This is really FIRE...

**@shahin\_r** · 1 upvotes

> impressive one.

**@thijsdev** · 1 upvotes

> Yup, Github Copilot is great with UI. However it gets lost when the AI dives into the backend.

**@emporteme** · 1 upvotes

> Good idea
> I was thinking what kind of posts I can do here and showcasing my side projects is a good idea

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---

Tags: [#react](https://daily.dev/tags/react), [#github](https://daily.dev/tags/github), [#typescript](https://daily.dev/tags/typescript), [#vscode](https://daily.dev/tags/vscode), [#pwa](https://daily.dev/tags/pwa)

[View this post on daily.dev](https://daily.dev/posts/building-a-complete-fire-calculator-app-with-github-copilot-in-one-chat-session-cinztaiec)