Seoul 3D Atlas v5.4 - Explore Seoul in 3D - transit, landmarks, tourism, city data

Hi Product Hunt! 👋 I’m Jinho, the maker of Seoul 3D Atlas. This project started with a simple question: what if Seoul could be explored as a living 3D city instead of a flat map? The first version focused on visualizing the city itself. From there, the project kept evolving through repeated use and feedback. I added subway and bus routes, landmarks, hotels, cultural sites, multilingual navigation, multiple currencies, weather, seasons, and day/night experiences. Today, Seoul 3D Atlas brings together more than 267,000 buildings and multiple layers of public city data in one interactive web experience. One of the most unexpected moments came when I shared the project on X (Twitter). The post and demo reached more than 330,000 views, and the reactions helped convince me that people were genuinely interested in exploring a city this way. What makes this launch especially meaningful to me is how it was built. I used the latest version of GPT-6 Astra throughout the development process—not just to generate an initial prototype, but as part of an ongoing engineering workflow. I repeatedly defined new requirements, tested results, found problems, refined the UX, debugged implementation issues, and evolved the product over many iterations. For me, the most interesting part of working with Astra was seeing how AI-assisted development changes when the project keeps growing and the requirements keep changing. Seoul 3D Atlas is still an experiment rather than a perfect digital twin. My goal is to explore a new way of experiencing a city by combining 3D visualization, transportation, tourism, and urban data in one place. I’d love to hear what you think—and what you’d explore first: transit, landmarks, tourism, weather, or just flying around Seoul. 🚇🏙️🌧️ Thanks for checking it out!