Hey Product Hunt! I'm Huy, the maker of Packet Island. This project is inspired by my System Design ebook. I wanted to give readers a place to try the ideas: change a setting, follow a request, and see why the outcome changes. Packet Island turns those concepts into 12 interactive 3D lessons. You can explore bottlenecks, replication, databases, load balancing, caching, queues, retries, security, observability, and the tradeoffs that connect them. Each lesson has a small experiment, guided notes, and a self-check with an explanation. Try raising traffic, changing a cache TTL, or adding workers to a busy queue. The models show their assumptions so you can reason about the result. There's also a milk tea shop sandbox where you place buildings, connect routes, and try to handle a traffic spike within a budget. It's free, runs in your browser, and doesn't need an account. English and Vietnamese are available throughout, with dark mode, mobile layouts, and reduced-motion support. Your learning progress stays in your browser. A good place to start is the first lesson, then jump to caching or queues and change one setting at a time. I'd love to hear which concept becomes clearer after trying it, and where the explanation still leaves you with questions. Explore: https://learnsystemdesign.guru/en/ Thanks for taking a look! Huy

Packet Island

Learn system design through playful 3D experiments

Learn system design through playful 3D experiments