Where our data comes from
The appraisal district exports we use, how often they're refreshed, what we never publish, and the JSON API.
Sources
| County | What we use |
|---|---|
| Collin | The Collin Central Appraisal District's certified appraisal data, published as a yearly dataset on data.texas.gov ("Collin CAD Appraisal Data"): values as noticed and as certified, last year's values, home facts, exemptions, taxing units, the tax agent on file and protest status. Tax rates and exemption amounts come from the district's entity list on the same site. |
| Dallas | The Dallas Central Appraisal District's certified data files with supplemental changes, from its data products page: certified values, last year's values, home facts, exemptions, taxing units and the tax agent on file. Protest results come from the district's appraisal review board files on the same page: the value on each protested home's notice, the value it ended at, and whether the owner or an agent filed. It doesn't include tax rates, so Dallas pages show no tax estimate yet. |
| Denton | The Denton Central Appraisal District's certified residential export from its website: certified values, home facts, exemptions and the tax agent on file. It doesn't include noticed values, last year's values, protest results or tax rates, so Denton pages show the comparison with similar homes only. |
| Tarrant | The Tarrant Appraisal District's current appraisal export (True Prodigy), its agent summary data (each building's quality grade) and last year's certified residential data, all from its data downloads page: current values, last year's values, home facts, homestead and disabled veteran exemptions and the tax agent on file. It doesn't include noticed values, protest results or tax rates, so Tarrant pages show the comparison with similar homes only. |
We cover single-family homes, condos, townhomes, rural homes and mobile homes. Land-only parcels (vacant lots, HOA common areas) are left out. More counties will be added as we confirm their exports include what the verdicts need.
How often it's refreshed
We download every county's current export and rebuild the whole dataset at once, typically daily to weekly. Each rebuild is checked before it goes live, and every page reflects one consistent snapshot. Values are as of the appraisal year shown on each page; protest results are last year's, or this year's once the district certifies them.
What we never publish
- Owner names. They appear in the districts' exports, but our pipeline drops them before anything reaches the site. They're never shown, searchable or returned by the API.
- Single houses on area pages. Area pages list streets with at least 10 homes, never a house.
- Verdict pages in search results. A home's own page can be opened by anyone with its address but is marked so search engines don't list it.
JSON API and MCP
The same numbers are available as data, free and without a key, for research and for AI assistants:
GET /api/v1/check?address=…or?id=…: one home's verdict, comparison with similar homes, record and estimates. When several homes match an address it returns them (status 300); call again with an id.GET /api/v1/area?path=/tx/collin-county: a state, county, city or neighborhood page's findings and numbers.POST /api/mcp: a Model Context Protocol server (Streamable HTTP) with the toolscheck_propertyandneighborhood_stats.
Please keep requests modest; heavy use is rate-limited. If you quote our numbers, link the page they came from and keep the disclaimers: we're not affiliated with any appraisal district, and nothing here is legal or tax advice.
Found an error?
If your home's facts are wrong, that's worth raising with your appraisal district: an error on the record is grounds to protest. Our numbers are recomputed from the district's records with every refresh, so a corrected record shows up here after the district publishes it.