Three tools, three different jobs

Only for part of what Zoneomics does. Zoneomics is a zoning-data platform: structured attributes across 23,500+ cities, an API, bulk access and zoning reports including certified letters. GoCodebook is a California-only reader over adopted code text — zoning ordinances plus 12 of the 13 parts of the 2025 Title 24 (all but the Electrical Code, Part 3, which the library holds only in its superseded 2019 and 2022 editions) — that answers questions in plain English and cites the section. If you need national coverage, an API or a certified report, Zoneomics is the right tool and GoCodebook does not replace it.

Different purpose. The National Zoning Atlas is a nonprofit research project — Land Use Atlas, Inc., housed at Cornell's Legal Constructs Lab — that codes zoning across 30,000+ jurisdictions into standardised categories so researchers and policymakers can compare places. It is built for studying zoning. GoCodebook is built for working under it in one state: the verbatim text, the local amendments, and an answer you can cite at plan check.

Because the depth is the product. 540 jurisdictions, 1,199 documents, 1.2 million+ sections and 12 of the 13 parts of the 2025 Title 24 (all but the Electrical Code, Part 3, which the library holds only in its superseded 2019 and 2022 editions), with local amendments reconciled against the state code. Reproducing that nationally is a different amount of work than adding rows to a table, and doing it badly is worse than not doing it.

That is the common case. Zoneomics or a parcel dataset tells you the district and the lot; GoCodebook tells you what the adopted text requires once you are inside it. They answer different halves of the same project question.

Use zoning datasets for geographic comparison and screening. For a specific project or property decision, inspect the adopted text, applicable dates, exceptions, and site facts.

Not primarily. GoCodebook researches the zoning text itself, from California city and county codes, and answers questions about a specific property or rule with citations. A structured zoning dataset is the better fit for comparing many places at once.

A mapped district tells you which rules to read, not what they say. Height, setbacks, permitted uses and exceptions are in the zoning text, and an overlay or specific plan can change them. GoCodebook reads the text behind the district where the jurisdiction's code is in its library.

California local and state sources, plus selected federal authorities. Coverage varies by topic and jurisdiction. The library holds 1,199 codes, ordinances and statutes for 540 California cities and counties, with 1.2 million+ sections you can read in full. Research spans design, inspection, permits, transactions, rentals, HOA, property tax and foreclosure.

Library search and AI answers use credits. Plans, credit packs and any current trial are listed on the Pricing page.

No. Verify the original language, jurisdiction, edition or effective date, exceptions, and property facts. Any AI tool can miss relevant material or misapply a provision. A research answer does not replace professional review or an official determination.