What each column means, what the state badge says, and why fields are blank.
Each row is one product. Most of what you see we worked out ourselves rather than being told, which is why a lot of it is blank and why the blanks are deliberate.
This page goes column by column: the state badge, the dates and where they came from, the three inferred labels, and what an empty cell actually means.
Whether the product is still answering, and there are three answers. Live means the homepage answered normally on the last check. Quiet means it answers but nothing on it has changed in months. Dead means it is no longer there: either it stopped answering, or it now sends you to a different address and has done for a while.
When an app is dead we say how it ended, on its own page. A domain that stopped resolving and one that redirects to a larger company are different stories, and the second is not proof of an acquisition on its own: companies rebrand, move to better addresses, and fold two products into one. So we print what we saw, including where the address now points, and leave the conclusion to you.
Live, dead and unknown has the thresholds. A state is never for sale and never has been: a sponsored app that dies still shows as dead.
Domain changed hands sits beside the state rather than replacing it, and means the address belongs to somebody else now. It happens after a product shuts down: the address lapses, somebody buys it, and the site there has nothing to do with the app this record is about. The app is still dead, because it is, and we keep the record and stop linking to it.
Every date carries where it came from. Observed means we watched it happen and the date is exact. Reconstructed means we inferred it from archives or certificate logs, and it is accurate to weeks rather than days.
First seen is not a launch date. It is the day this record starts, and for anything older than us it is reconstructed.
All three are inferred from what the product publishes about itself, and all three come from a fixed list. They are labels we arrived at, not answers anybody gave us.
Where the labels come from covers how, and what to do when one is wrong.
Because unknown is a real answer here and we print it rather than guessing. When we are not sure, we leave it blank. Guessing would mean printing "venture-backed" on somebody's weekend project.
A dash and the word unknown are not the same answer. Unknown means we looked and could not tell. A dash means nothing has looked at that field yet, and it is the common case: we check every app on a schedule, and the deeper reads reach a record later than the first one does.
A blank is also common on established products, where the signals we read are the ones a small product publishes and a large one does not.
Opening a row gives you every field we hold, filled or not, grouped by the question it answers: what it is, how far it reaches, what it costs, who is behind it, what it is built on, and what has happened to it.
Use Report an error on the listing itself. It needs no account. If the product is yours, claim the listing and you can propose the change directly.