Before you start

Craigslist, OfferUp and Facebook Marketplace — all three, on every plan including free. You can drop any of them per search with one tap.

Deal Scanner keeps checking in the background and pushes as soon as a scan turns up a match, rather than batching matches into a digest.

The gap between a listing's price and the typical price of similar listings for that search, stated as a percentage below typical. It's a comparison, not a grade we invent.

No. Set the search once and close the app — the watching happens for you.

Yes. The alert opens the original listing, and Deal Scanner copies an opener so you can paste it into your first reply.

Turn one search off to free a slot, or move up a plan. Turning a search off keeps it — it just stops watching.