The sentence on your launch page that a stranger can check in under a minute
I spent this week pushing one founder on a single claim in his launch copy, and by the end he had changed shipped text three times. Not because the claim was false. Because it was true of something narrower than the sentence said.
His tagline promised every file was cryptographically signed for verifiable provenance. True at the moment the file was made. Not true after anyone trims it in another tool, which is what happens to almost every file before a human sees it. The honest version of that sentence already existed on his site. It was in the footer.
Then the description said a free tier was available, while the product served me a waitlist, because it had opened in one region only.
Neither of those is a lie. Both are things a visitor can catch in under a minute, and the person most likely to check is the person you most wanted to convince.
The fix each time was about twenty words. Signed at creation, edits in our own tools keep it, third party tools may not yet. One region first, everywhere else on the waitlist. A promise you cannot keep becomes a roadmap, and it costs you a clause.
Worth reading your own launch page once as the person trying to disprove it, rather than the person who wrote it.
Replies
ClinicFrame
Your test assumes the claim is checkable. In my category the standard claim is not, and everyone ships it anyway.
Every tool in healthcare AI says HIPAA compliant. No body certifies HIPAA, so there is no badge a stranger can look up, and the sentence can be neither confirmed nor refuted in a minute. What it actually does is train the serious buyer to skip the sentence and ask for the artifact instead: the signed BAA, the subprocessor list, the security report.
So the version of your rule I would add is this. When the claim in your category is unverifiable by design, writing it better buys you nothing. The move is publishing the checkable thing beside it. In my case that means saying whether the BAA can be signed without a sales call, and naming the model provider behind it. That is the sentence a stranger can test.