Get Instant Alerts for New Instagram Follows – Is There a Reliable Option?

Someone in an online forum mentioned using alerts to get notified whenever a public Instagram account follows someone new. It sounded convenient, but no one explained which service they were using.
Does anyone have experience with a tool that sends fast and accurate notifications? I'd be interested in hearing your recommendations.

A while ago I was helping a sister monitor updates from a few public Instagram pages because manually checking them every day became quite annoying. We were looking for something that could make the process easier, and after trying different options, recently-followed gave a good impression. I liked that the information was organized clearly and the tracking process didn’t require constant attention. It was useful for noticing changes faster and keeping everything in one place instead of repeatedly opening profiles and comparing updates by hand.