Show HN: I visualized the entire history of Citi Bike in the browser
freemanjiang Wednesday, January 07, 2026
Each moving arrow represents one real bike ride out of 291 million, and if you've ever taken a Citi Bike before, you are included in this massive visualization!
You can search for your ride using Cmd + K and your Citi Bike receipt, which should give you the time of your ride and start/end station.
Everything is open source: https://github.com/freemanjiang/bikemap
Some technical details: - No backend! Processed data is stored in parquet files on a Cloudflare CDN, and queried directly by DuckDB WASM
- deck.gl w/ Mapbox for GPU-accelerated rendering of thousands of concurrent animated bikes
- Web Workers decode polyline routes and do as much precomputation as possible off the main thread
- Since only (start, end) station pairs are provided, routes are generated by querying OSRM for the shortest path between all 2,400+ station pairs