Parcel
Click anywhere on a map of San Francisco and get the zoning code plus a plain-English explanation of what you can build there.
Look up zoning laws and restrictions for any location in San Francisco. Search an address or click anywhere on the Leaflet map; a PostGIS spatial query finds the zoning district and Claude turns the planning code into a plain-English interpretation of what you can build or do there, with a link to the official San Francisco Planning Code.
Interpretations are cached so repeat lookups return instantly, searches are IP rate-limited (30 free, then $5 for unlimited via Stripe), and the stack is React + Leaflet over FastAPI, with PostgreSQL/PostGIS on Supabase, deployed to Railway and Vercel.
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Clicked around the Mission and got the zone (UMU, Urban Mixed Use) plus the assessor record: assessed value, land versus improvement split, year built, square footage, even five real building permits with statuses and filed dates. Same for a Sunset address search, which auto-zoomed and came back RH-1 with the right single-family rules. The explanations differ by zone instead of reusing one paragraph. Only gripe: clicking a street or the bay gives the same 'no zoning district found here' message, so a few of my clicks missed before landing on an actual lot. Real data, just needs slightly more forgiving click targets.