Start here for any accessibility, a11y, WCAG or ADA question about one website whose current state you do not already know — 'how are we doing', 'is this working', 'are we covered', 'should we worry'. It is the cheapest way to learn what has been measured and how much of the site that covers, which every later tool choice depends on. The whole current position for one website in a single call: plan and whether a trial or failed payment is about to change it, the headline accessibility score and when it was measured, how many pages are being checked automatically against how many the plan includes, this month's visitor count against the plan's allowance, whether an accessibility statement is published, whether the widget is switched on, and whether anything is currently stopping scans from running. "coverage" says how much of the site the score describes: monitored pages, the plan's page allowance, and what the last crawl found against what it scanned — a score measured over one page of a site with 82 discovered pages is a fact about those pages, and the unscanned ones are neither passing nor failing. Then use the finding-level tools for detail. Do not use it to list problems: it reports counts, never individual violations. Read-only: costs one read and loads no page, so it is cheap and safe to call first. It reports what is on record: a site that has never been scanned returns no score rather than a good one, and a missing number never means a clean result. Where the score is missing for a reason other than that — a crawl is running and it is withheld until the crawl finishes, or the plan does not include scan data — scoreNote says so, so a null score is never read as "never scanned". It works on every plan, including Free: where the plan does not include scan data the score, the scan and the coverage come back null with scoreNote explaining which kind of missing that is, and the plan, widget state, page allowance and visitor counts are still reported in full.