Live app · built from a recipe

Valuation & Taxation Base Map

Before appealing a tax assessment, an owner wants to know: is the value about the property, or about when it was bought? In California, assessments follow the purchase year, so similar homes on one street can be taxed very differently. Drag a divider across the map: value per square foot of land on one side, the year that value was set on the other. Click a parcel to compare its block and see the two appeal routes. No opinion of value, no owner names. Runs live on Los Angeles County’s 2.37 million parcels.

Runs on Strata, or on your existing Esri services. Opens in a new tab.

The story

How the app works — the walkthrough

A short, self-contained deck that walks through what the app does. Use the arrow keys inside it, or open it full-screen.It opens full-screen in a new tab.

Open the walkthroughFull-screen deck · best held sideways
How it was built

Cloned a recipe, opened it in Claude — the app built itself

This app — and 44 others — were generated in a single run from recipes handed to Claude. Clone the recipe from our GitHub repository, open it in Claude, and start building advanced, Esri-compatible web mapping applications immediately, on your own data.