Trailsense

Hey, I'm Francesco, one of three people behind Trailsense, along with Felix and Lea. We build small solar-powered sensor nodes that count how many people pass by on a hiking trail, without cameras and without hikers having to install anything. The nodes listen for wifi probe requests, the background pings a phone sends out while scanning for known networks, and turn them into an aggregated count. No raw probe request data ever leaves the node, and no personal data is stored anywhere in the system. The idea started at the Tourism Technology Hackathon in 2025, where Tirol Werbung brought us a real problem: they know exactly how many people sleep in which hotel each night, but almost nothing about where those people go during the day. We kept working on it as our master's project, and this year we ran a pilot on the Nordkette in Innsbruck alongside Tirol Werbung. Right now Trailsense is pre-commercial. The pilot is done, we're refining the dashboard and the node hardware, and we don't have a public demo up yet since it's still a bit rough around the edges. Longer term we want to add a public-facing side too, something like Google Maps traffic data but for hiking trails, so hikers can check how busy a trail is before heading out. For now our focus is the municipality and tourism board side. We're posting here mainly to get feedback, whether you've built sensor hardware yourself or you're just someone who hikes and has opinions about being tracked outdoors. What would make you trust a system like this to collect data around you? And if you were a hiker using a public facing traffic-map version someday, what would you actually want to see on it? Our node firmware is open source on GitHub (github.com/trailsense) if you want to see exactly how the data collection works. Happy to answer any questions.