Built because nobody reads the documents.

England's planning system is plain about how it works: decisions follow the development plan unless material considerations indicate otherwise. Everything turns on documents: hundreds of pages of statute, national policy and local plans that almost nobody involved has time to read. Clerks answer consultations without them. Objections cite policies that do not exist. Sites are bought and lost on paragraphs nobody checked.

AI was supposed to fix this, and mostly made it worse: fluent answers from memory, invented citations, and no way to tell the good from the confident. The Planning Inspectorate now warns that fabricated citations can cost you.

OTTO is a bet on the opposite posture. It reads the documents in full, answers only from them, quotes every source verbatim, has every answer independently checked, and publishes its accuracy on an exam it must pass before any release ships. When the documents do not answer, it says so. The same engine, the same evidence, whoever asks.

It is built independently in England, obsessively, by people who read planning documents so you do not have to. If that posture matters to you, you will probably like the product.