Building a Travel Power Adapter Tool with Claude in a Weekend

I travel a lot. And every single time, I'm standing in an airport Googling "do I need an adapter for Thailand" while my boarding group is already lining up. The existing tools for this are bad. They're buried in blog posts from 2016 with popup ads, or they're a wall of text that doesn't actually answer the question. I already had most of the data. My destination guides on Vientapps cover dozens of countries, and each one tracks the local plug type and voltage. The pieces were sitting there. I ju