A catalog of shops and brands whose products are actually made where the seller claims. Entries are verified by the editors. The map runs on Leaflet and OpenStreetMap, so there are no Google Maps keys and no per-thousand-view bill.
Distance and travel time are computed by the browser: haversine gives the straight line, and two custom curves turn it into road kilometres and minutes of driving. The curves are calibrated on 460 real car routes from 400 m to 500 km. Median time error is 13.6 percent, and 13.5 on routes outside the training set — half of the estimates land within six minutes of a real router. The result is shown with a "≈", because traffic is not included.
Because the calculation happens on the reader’s side, their location never leaves the browser. The geocoder and the router exist as server routes with guards towards OpenStreetMap: one request at a time, spacing, a cache for repeats and a per-IP limit.
On top of that: a catalog with filters, search with a synonym dictionary, discount codes, forms and one JSON-LD graph per page. Performance: mobile 81 → median 91, page weight 793 kB → 415 kB, accessibility 100 on both mobile and desktop. The whole measurement, including what was rejected after measuring, lives in the project documentation.