Building Copper's Corner: A Fitness Tracker Revolution

This chapter explores the development of Copper's Corner, a mobile fitness tracker app aimed at simplifying workout logging through innovative use of AI technology. It covers key features, technical insights, and the significance of user experience in creating a seamless fitness tracking solution, particularly for the Apple Watch.

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Terry Lin is a product manager and developer who built Cooper’s Corner, an AI-powered fitness tracking app that works across iPhone and Apple Watch. Frustrated with traditional fitness apps that require extensive setup and manual logging, Terry created a solution that lets users simply speak their exercises, weights, and reps. The app automatically structures this data and provides analytics on workout consistency and progress. In this episode, Terry shares his vibe-coding process using Cursor and Xcode and explains how he optimizes his codebase for AI collaboration.

What you’ll learn:

1. How Terry built a voice-powered fitness tracker that works across iPhone and Apple Watch

2. His “dual-wielding” workflow, using Cursor for coding and Xcode for building and debugging

3. Terry’s three-step process for working with AI: create, review, and execute

4. Why optimizing your codebase for AI collaboration can dramatically improve productivity

5. How to use index cards and GPT-4 to rapidly prototype mobile interfaces

6. A technique for “vibe refactoring” that keeps code organized and optimized for both human and AI readability

7. His “rubber duck” technique to better understand generated code and improve your learning process

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