Pasting a listing into a chatbot is a perfectly good rough first pass — it will catch the obvious. But the check you publish on has to be current, consistent, and provable, and that’s a different job. Here’s the honest comparison.
| A general chatbot | PreFlight | |
|---|---|---|
| Current rules | Applies whatever it was trained on. Will cite the repealed CPRs, or tell you “offers over” is fine on a rental — banned for lettings since 1 May 2026. | Runs a version-stamped rulebook that is updated when the law changes. Every check names the rulebook version it ran under. |
| Consistency | A different answer each run. Paste the same listing twice and the second verdict can contradict the first. | Deterministic checks: the same listing produces the same verdict, every time. That’s what makes a verdict worth acting on. |
| Evidence | A chat window. When someone asks what you did before publishing, there is nothing to show. | A timestamped, version-stamped audit record for every check — downloadable, with a reference number, kept by you. |
| Grounded findings | Can hallucinate legal thresholds — a deposit cap that doesn’t exist, a rule that was never written. | Quotes the exact offending words from your listing and names the rule and guidance version behind every finding. |
| Safe fixes | Asked to “fix” a listing, it will invent the missing council tax band or EPC rating — which creates a brand-new breach. | Never fabricates a fact. Missing information stays as a prompt for you to fill in; suggested fixes only delete, soften or reformat what you wrote. |
| Coverage | General knowledge, worldwide, none of it guaranteed to match UK practice. | Sales, lettings and HMO, against UK-specific rules — DMCC Act 2024, Renters’ Rights Act 2025, Tenant Fees Act 2019 and the rest. |
Ask a chatbot to make a non-compliant listing compliant and it will do exactly that — by writing in a council tax band it doesn’t know, an EPC rating it guessed, a lease length it invented. The listing now looks complete and is misleading in a way the original never was.
PreFlight’s fixes are built so that inventing a fact is structurally impossible: it can delete an unlawful phrase, soften an overclaim, or reformat what you wrote — and nothing else. A missing fact stays visibly missing until you supply it, and the audit record shows which is which.
A 15-minute call with the founder — bring a couple of your live listings and we’ll run them through together. No slides, no obligation.
Same listing, same verdict, every time — with a record you can put in front of anyone who asks. Try it on your next listing, free.
Check a listing