Timeclock app
Version 1 - Basic minimal html/javascript/php
Version 2 - Used Cursor AI IDE to add many new features in 2 hours!
Version 3 - Complete rewrite using Laravel and Vue.js

Fractals
Version 1 - Golang with JavaScript Webworkers doing the math in the browser
Version 2 - Golang with golang doing the math on the backend with WebAssembly via proxy
Version 3 - Rust implementation also doing the math on server with WebAssembly via proxy

Mazes
Version 1 - Three.js Maze Generator - with gerbil in 3d maze