In a post about anchoring, someone mentioned an anchor alarm for iPhone. I've googled and searched the app store, and found several, but most of the reviews are from 5-6 years ago, and knowing how fast things change, the "winner" then may be a loser now.

Does anyone have a favorite, for simplicity and accuracy (and price, of course)? Drag Queen, Anchor Watch and Anchor! seem to be the front runners, but would love to hear if someone has current personal experience with one.

Thanks!