aubryio

isochrone.ch is an interactive web app illustrating public transport accessibility in Switzerland. Pick any starting point and it shows you where you can go within a given amount of time. This is quite useful in a country with such an amazing public transport network where most people don't own a car (people can typically use it to find new hiking or skiing destinations, when searching for a new flat, etc.).

The innovation here is that the transit routing logic runs on the client; I wrote a little open source library (minotor.dev) implementing the RAPTOR algorithm in TypeScript and optimizing timetable data (GTFS from https://opentransportdata.swiss) to be shipped to the browser. This enables super responsive visualizations as no round trips to the server are needed.

I built it on my free time and published the first version early 2025 but kept improving it since then (range query support, altitude filters, memory optimizations, etc.).

Thank you for this constructive comment. The visualization is using deck.gl which requires WebGL. I'm working on a fallback message but for now it won't show any data if your browser doesn't support WebGL.