Jovan Spasojevic

Landing in a new city is always that same mix of excitement and chaos you don't speak the language, your SIM card isn't working yet, and you're scrolling through blog posts from 2019 trying to figure out if that coworking space still exists.

I built Sour Mango because I kept wishing I had one place that just knew visa rules for my passport, real Wi-Fi speeds at nearby cafes, what things actually cost, and tips from people who were just there last week, not three years ago.

Having that kind of info in your pocket changes how you travel. You walk into a new city with confidence instead of anxiety.

If that resonates, we just launched on Product Hunt would love to hear what you think.

After months of building, Sour Mango is officially available to download. It's an all-in-one travel companion built for digital nomads and remote workers.

What it does:

• AI-powered travel assistant that knows visa rules, costs, and local tips

• Discover destinations with real data Wi-Fi speeds, cost of living, safety scores

• Community recommendations find the best cafes, coworking spaces, and restaurants from fellow nomads

• Speed test mapping contribute and check Wi-Fi quality worldwide

• Travel history and achievements track your journey across cities and countries

• Flight prices and visa requirements based on your passport and location

The research is surprisingly strong in favor of this.

Du et al. (ICML 2024) showed that when you get multiple LLMs to debate each other, not just share answers, but actively challenge each other's reasoning, then factual accuracy goes up and hallucinations go down. The wildest finding was that in some cases, every model started with the wrong answer but converged on the correct one through debate. The process itself generated correctness that no individual model had.

This is why xAI shipped a 4-agent debate inside Grok 4.20 three days ago. One of the leading AI labs looked at every way to improve output quality and landed on structured debate.