Save a search and hear about anything new that matches it.
A watch follows one product. An alert follows a question: everything matching a search you saved, including products that do not exist yet.
Two things surprise people, and both are worth knowing before you save one. An alert never mails you what already matched when you saved it, and an app can be new to your alert without being new to AppWatch.
Filter AppWatch however you like and press Save as alert. Editing one reopens the same screen with those filters applied, so what an alert matches is always exactly what you can see.
An alert needs at least one filter. Saving everything would be a subscription to everything.
Mail you what already matched. Anything your filter already covers when you save it counts as seen. Otherwise the first email would tell you 312 apps just arrived in a filter you made this morning.
Alert you twice about the same app. An app that enters your filter, leaves, and comes back does not fire again.
Two different things, and the email says which per row. Arrived means the product launched after you saved the alert. Now matching means it has been listed a while and only matches now because we learned something new about it.
Calling the second one new would teach you a product launched this week when it launched eight months ago.
Pausing picks up from the day you turn it back on, so a fortnight of arrivals does not land at once. Deleting starts over: save the same filters again and everything matching on that day counts as seen.
Weekly on the free plan, daily on Starter and Pro. A quiet week sends nothing.
Every alert email carries a link that switches off that alert, so you never have to choose between one noisy alert and all of them.
Alerts are a paid feature: five on Starter, twenty-five on Pro. CSV export of an alert's results is on Pro. Plans and billing has the table.