Find sunny spots in real time ☀️

What it does

Lumio helps you find sunny spots in your city in real time ☀️ Instead of just telling you the weather, Lumio shows where the sun actually is — so you can choose the best place to sit, relax, or enjoy a coffee. Discover sunny cafés, parks, and outdoor spaces with a simple “Sun Score” based on real-time conditions. Built for cities where sunshine is limited — so you can make the most of every sunny moment. No more sitting in the shade when the sun is right around the corner.

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• AM
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  I wanted to sit outside for coffee but there was no way to see which cafes are in the sun right now. So I built a map that shows which cafes, benches, and outdoor seats are in the sun vs. shade at any time of day. It ray-marches building shadows live in a WebGL shader over a MapLibre map. I also pre-index all places from OpenStreetMap into H3 hex cells and serve them as static JSON on Cloudflare R2, so the client just fetches the cells in view and no backend is needed. Feedback welcome, especially on shadow accuracy in your city. Currently only buildings and trees are taken into account when…

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  HotSpot2024 · ▲159

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  Coffee in the Sun V2.0Mar 2026 · ▲1

  Real-time shadow maps to find your spot in the sun

• TL
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