Reverse Engineer the App
Explore how simple apps are put together. Click a demo, inspect the interface, logic, prompt, and feature structure, then learn how to rebuild it yourself with clean front-end thinking.
Break a finished experience into interface, state, events, and prompt-driven build instructions.
Every demo here uses HTML, CSS and JavaScript only, so learners can fully understand the mechanics.
Ideal for anyone learning how to turn a rough idea into a sharper AI build prompt with structure.
See what matters most so you can scope better apps, reduce fluff, and improve your vibe coding prompts.
How to reverse engineer almost any mini-app
Observe the surface
List every visible part: buttons, cards, counters, toggles, fields, messages and motion.
Find the state
Ask what the app must remember: score, timer, current question, active tab, input value or completion status.
Trace the events
Map each click, drag, submit or reset action to a simple rule that changes the interface.
Write the prompt
Describe the user experience, state, logic and style clearly so the model builds the right thing first time.