Flat routes across San Francisco

31 Jul 2026

While attending YC SUS in San Francisco, I did a lot of walking and plenty of non-optional hill climbing. I didn't always want the fastest route, sometimes I just wanted to minimise elevation gain and spare my knees. So I built a map that lets you choose what your walking route optimises for: the fastest path or the flattest one.

loading terrain…

Credits

Street network and place names: © OpenStreetMap contributors, ODbL. Basemap tiles: OpenFreeMap. Elevation: Tilezen terrarium tiles on AWS Open Data — United States 3DEP terrain data courtesy of the U.S. Geological Survey. Rendering: MapLibre GL JS, with contours cut in the browser by maplibre-contour.