# Check That Field

> How likely England's fields are to be built on for housing: the map, the reports, the widget and the API.

- [Check That Field](https://docs.checkthatfield.com/index.md): How likely a field in England is to be built on for housing, from published planning records.
- [Check a field](https://docs.checkthatfield.com/quickstart.md): Find a field on the map and read its free report in a few steps.
- [Finding a field](https://docs.checkthatfield.com/app/searching.md): Search by postcode, town or village, use your location, or draw the field on the map.
- [Using the map](https://docs.checkthatfield.com/app/the-map.md): Read the map's colours, open a field, pick several fields and score many at once.
- [The free report](https://docs.checkthatfield.com/app/free-report.md): What the free report tells you about a field, and how far to trust it.
- [The deep report](https://docs.checkthatfield.com/app/deep-report.md): Every reason behind the score, a web check, planning applications nearby and what could change.
- [Check again](https://docs.checkthatfield.com/app/check-again.md): Bring a report up to date with the planning records and web results we hold now.
- [Your account](https://docs.checkthatfield.com/app/accounts.md): Signing in, saving fields and searches, guest purchases and deleting your account.
- [Pricing](https://docs.checkthatfield.com/app/pricing.md): What's free, what the deep report costs, and what isn't on sale yet.
- [How the score works](https://docs.checkthatfield.com/concepts/scoring.md): What raises a field's score, what lowers it, what caps it, and what the bands and outlooks mean.
- [Planning applications](https://docs.checkthatfield.com/concepts/planning-applications.md): Where the planning applications come from, how we place them on fields, and how a report uses them.
- [Coverage](https://docs.checkthatfield.com/concepts/coverage.md): Which areas we cover, which councils' registers we read, and what low confidence means.
- [Data sources](https://docs.checkthatfield.com/concepts/data-sources.md): Where the data behind every score comes from, and the attributions it carries.
- [Questions](https://docs.checkthatfield.com/faq.md): Answers about the free and deep reports, prices, keeping a report up to date, the data and the API.
- [Widget overview](https://docs.checkthatfield.com/widget/overview.md): Show how likely the fields near a home are to be built on, in your own page, with two lines of HTML.
- [Install the widget](https://docs.checkthatfield.com/widget/install.md): Add the widget to a page with the loader script, or as a plain iframe for sites with a strict Content Security Policy.
- [Widget options](https://docs.checkthatfield.com/widget/options.md): The data attributes the loader reads, and the matching query parameters for a plain iframe.
- [What readers see](https://docs.checkthatfield.com/widget/states.md): Every state the widget can be in, the exact words readers see, and what to do about each.
- [Security and privacy](https://docs.checkthatfield.com/widget/security-and-privacy.md): Why a publishable key is safe in your page, who may frame the widget, and what the widget counts.
- [API overview](https://docs.checkthatfield.com/api/overview.md): Scores for England's fields, around a postcode, place, address or point, as JSON for your server.
- [Authentication](https://docs.checkthatfield.com/api/authentication.md): Get a key, send it as a bearer token, and keep it secret.
- [Quotas and limits](https://docs.checkthatfield.com/api/quotas-and-limits.md): Your monthly quota, what counts as a call, the per-minute limit, and the 15-second cap.
- [Errors](https://docs.checkthatfield.com/api/errors.md): Every error the API returns, what it means, and what to do.
- [Pending scores](https://docs.checkthatfield.com/api/pending-scores.md): Why a field can come back without a score, and how to ask again.
- [Attribution](https://docs.checkthatfield.com/api/attribution.md): What you must show wherever you show our data, and how to treat planning applications.
- [Public metrics](https://docs.checkthatfield.com/api/public-metrics.md): Headline counts of what Check That Field covers. No key needed.
- [Scores](https://docs.checkthatfield.com/api-reference/scores.md): Open fields around a postcode, place, address or point, with their scores.
- [Field](https://docs.checkthatfield.com/api-reference/field.md): One field: its score, reasons, and the housing applications within a kilometre.
- [Usage](https://docs.checkthatfield.com/api-reference/usage.md): Calls made with this key this month, against its quota. Not counted itself.
- [Admin overview](https://docs.checkthatfield.com/admin/overview.md): The admin page for the Check That Field team: who can open it and what each tab is for.
- [Keys](https://docs.checkthatfield.com/admin/keys.md): Issue, send, monitor and revoke partners' keys for the API and the widget.
- [Metrics](https://docs.checkthatfield.com/admin/metrics.md): What each number on the admin Metrics tab means, and how often it is counted.

## OpenAPI Specs

- [openapi](/api-reference/openapi.json)


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