The roles worth applying to are the ones nobody has applied to yet. That argues for checking often, which is a tedious thing to ask of a person who is already having a hard month.
An alert is a saved search. When new postings land that match it, you hear about it. Because we pull from employer feeds every 12 hours, "new" here means genuinely new, not newly syndicated.

Saved once, runs forever
Keep the search you actually use and stop retyping it.
Matched against fresh feeds
Alerts fire on postings pulled from the employer, not on re-listed old ones.
Off in one click
Every alert email unsubscribes directly, and alerts can be deleted from the app.
Free
Free. Creating, running, and receiving alerts does not use credits.
Full documentation, including the limits